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      <PRIMARY_ID>SRX1985067</PRIMARY_ID>
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    <TITLE>GSM2254593: 1WT1Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
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        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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    <TITLE>GSM2254594: 3WT2Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
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        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
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        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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      <PRIMARY_ID>SRX1985069</PRIMARY_ID>
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    <TITLE>GSM2254595: 5WT3Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
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      <IDENTIFIERS>
        <PRIMARY_ID>SRP080128</PRIMARY_ID>
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          <PRIMARY_ID>SRS1590198</PRIMARY_ID>
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      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
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        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
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        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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    <TITLE>GSM2254596: 7WT4Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
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        <PRIMARY_ID>SRP080128</PRIMARY_ID>
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      <DESIGN_DESCRIPTION/>
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          <PRIMARY_ID>SRS1590199</PRIMARY_ID>
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        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
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        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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    <TITLE>GSM2254597: 2WT1Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
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        <PRIMARY_ID>SRP080128</PRIMARY_ID>
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          <PRIMARY_ID>SRS1590200</PRIMARY_ID>
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        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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    <PLATFORM>
      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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          <DB>gds</DB>
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    <TITLE>GSM2254598: 4WT2Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
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        <PRIMARY_ID>SRP080128</PRIMARY_ID>
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          <PRIMARY_ID>SRS1590201</PRIMARY_ID>
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      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
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        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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          <DB>gds</DB>
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    <TITLE>GSM2254599: 6WT3Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
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        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
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        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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    <TITLE>GSM2254600: 8WT4Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
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          <PRIMARY_ID>SRS1590203</PRIMARY_ID>
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        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
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        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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    <TITLE>GSM2254601: 15YoungWT1Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
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          <PRIMARY_ID>SRS1590204</PRIMARY_ID>
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        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
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        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
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        <XREF_LINK>
          <DB>gds</DB>
          <ID>302254601</ID>
        </XREF_LINK>
      </EXPERIMENT_LINK>
    </EXPERIMENT_LINKS>
    <EXPERIMENT_ATTRIBUTES>
      <EXPERIMENT_ATTRIBUTE>
        <TAG>GEO Accession</TAG>
        <VALUE>GSM2254601</VALUE>
      </EXPERIMENT_ATTRIBUTE>
    </EXPERIMENT_ATTRIBUTES>
  </EXPERIMENT>
  <EXPERIMENT alias="GSM2254602" accession="SRX1985076">
    <IDENTIFIERS>
      <PRIMARY_ID>SRX1985076</PRIMARY_ID>
      <SUBMITTER_ID namespace="GEO">GSM2254602</SUBMITTER_ID>
    </IDENTIFIERS>
    <TITLE>GSM2254602: 17YoungWT2Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
    <STUDY_REF accession="SRP080128" refname="GSE84951">
      <IDENTIFIERS>
        <PRIMARY_ID>SRP080128</PRIMARY_ID>
      </IDENTIFIERS>
    </STUDY_REF>
    <DESIGN>
      <DESIGN_DESCRIPTION/>
      <SAMPLE_DESCRIPTOR accession="SRS1590205">
        <IDENTIFIERS>
          <PRIMARY_ID>SRS1590205</PRIMARY_ID>
          <EXTERNAL_ID namespace="GEO">GSM2254602</EXTERNAL_ID>
        </IDENTIFIERS>
      </SAMPLE_DESCRIPTOR>
      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
        <LIBRARY_SOURCE>TRANSCRIPTOMIC</LIBRARY_SOURCE>
        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
      </LIBRARY_DESCRIPTOR>
    </DESIGN>
    <PLATFORM>
      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
      </ILLUMINA>
    </PLATFORM>
    <EXPERIMENT_LINKS>
      <EXPERIMENT_LINK>
        <XREF_LINK>
          <DB>gds</DB>
          <ID>302254602</ID>
        </XREF_LINK>
      </EXPERIMENT_LINK>
    </EXPERIMENT_LINKS>
    <EXPERIMENT_ATTRIBUTES>
      <EXPERIMENT_ATTRIBUTE>
        <TAG>GEO Accession</TAG>
        <VALUE>GSM2254602</VALUE>
      </EXPERIMENT_ATTRIBUTE>
    </EXPERIMENT_ATTRIBUTES>
  </EXPERIMENT>
  <EXPERIMENT alias="GSM2254603" accession="SRX1985077">
    <IDENTIFIERS>
      <PRIMARY_ID>SRX1985077</PRIMARY_ID>
      <SUBMITTER_ID namespace="GEO">GSM2254603</SUBMITTER_ID>
    </IDENTIFIERS>
    <TITLE>GSM2254603: 9YoungWT4Control; Populus tremula x Populus alba; RNA-Seq</TITLE>
    <STUDY_REF accession="SRP080128" refname="GSE84951">
      <IDENTIFIERS>
        <PRIMARY_ID>SRP080128</PRIMARY_ID>
      </IDENTIFIERS>
    </STUDY_REF>
    <DESIGN>
      <DESIGN_DESCRIPTION/>
      <SAMPLE_DESCRIPTOR accession="SRS1590206">
        <IDENTIFIERS>
          <PRIMARY_ID>SRS1590206</PRIMARY_ID>
          <EXTERNAL_ID namespace="GEO">GSM2254603</EXTERNAL_ID>
        </IDENTIFIERS>
      </SAMPLE_DESCRIPTOR>
      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
        <LIBRARY_SOURCE>TRANSCRIPTOMIC</LIBRARY_SOURCE>
        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
      </LIBRARY_DESCRIPTOR>
    </DESIGN>
    <PLATFORM>
      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
      </ILLUMINA>
    </PLATFORM>
    <EXPERIMENT_LINKS>
      <EXPERIMENT_LINK>
        <XREF_LINK>
          <DB>gds</DB>
          <ID>302254603</ID>
        </XREF_LINK>
      </EXPERIMENT_LINK>
    </EXPERIMENT_LINKS>
    <EXPERIMENT_ATTRIBUTES>
      <EXPERIMENT_ATTRIBUTE>
        <TAG>GEO Accession</TAG>
        <VALUE>GSM2254603</VALUE>
      </EXPERIMENT_ATTRIBUTE>
    </EXPERIMENT_ATTRIBUTES>
  </EXPERIMENT>
  <EXPERIMENT alias="GSM2254604" accession="SRX1985078">
    <IDENTIFIERS>
      <PRIMARY_ID>SRX1985078</PRIMARY_ID>
      <SUBMITTER_ID namespace="GEO">GSM2254604</SUBMITTER_ID>
    </IDENTIFIERS>
    <TITLE>GSM2254604: 16YoungWT1Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
    <STUDY_REF accession="SRP080128" refname="GSE84951">
      <IDENTIFIERS>
        <PRIMARY_ID>SRP080128</PRIMARY_ID>
      </IDENTIFIERS>
    </STUDY_REF>
    <DESIGN>
      <DESIGN_DESCRIPTION/>
      <SAMPLE_DESCRIPTOR accession="SRS1590207">
        <IDENTIFIERS>
          <PRIMARY_ID>SRS1590207</PRIMARY_ID>
          <EXTERNAL_ID namespace="GEO">GSM2254604</EXTERNAL_ID>
        </IDENTIFIERS>
      </SAMPLE_DESCRIPTOR>
      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
        <LIBRARY_SOURCE>TRANSCRIPTOMIC</LIBRARY_SOURCE>
        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
      </LIBRARY_DESCRIPTOR>
    </DESIGN>
    <PLATFORM>
      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
      </ILLUMINA>
    </PLATFORM>
    <EXPERIMENT_LINKS>
      <EXPERIMENT_LINK>
        <XREF_LINK>
          <DB>gds</DB>
          <ID>302254604</ID>
        </XREF_LINK>
      </EXPERIMENT_LINK>
    </EXPERIMENT_LINKS>
    <EXPERIMENT_ATTRIBUTES>
      <EXPERIMENT_ATTRIBUTE>
        <TAG>GEO Accession</TAG>
        <VALUE>GSM2254604</VALUE>
      </EXPERIMENT_ATTRIBUTE>
    </EXPERIMENT_ATTRIBUTES>
  </EXPERIMENT>
  <EXPERIMENT alias="GSM2254605" accession="SRX1985079">
    <IDENTIFIERS>
      <PRIMARY_ID>SRX1985079</PRIMARY_ID>
      <SUBMITTER_ID namespace="GEO">GSM2254605</SUBMITTER_ID>
    </IDENTIFIERS>
    <TITLE>GSM2254605: 18YoungWT2Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
    <STUDY_REF accession="SRP080128" refname="GSE84951">
      <IDENTIFIERS>
        <PRIMARY_ID>SRP080128</PRIMARY_ID>
      </IDENTIFIERS>
    </STUDY_REF>
    <DESIGN>
      <DESIGN_DESCRIPTION/>
      <SAMPLE_DESCRIPTOR accession="SRS1590208">
        <IDENTIFIERS>
          <PRIMARY_ID>SRS1590208</PRIMARY_ID>
          <EXTERNAL_ID namespace="GEO">GSM2254605</EXTERNAL_ID>
        </IDENTIFIERS>
      </SAMPLE_DESCRIPTOR>
      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
        <LIBRARY_SOURCE>TRANSCRIPTOMIC</LIBRARY_SOURCE>
        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
      </LIBRARY_DESCRIPTOR>
    </DESIGN>
    <PLATFORM>
      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
      </ILLUMINA>
    </PLATFORM>
    <EXPERIMENT_LINKS>
      <EXPERIMENT_LINK>
        <XREF_LINK>
          <DB>gds</DB>
          <ID>302254605</ID>
        </XREF_LINK>
      </EXPERIMENT_LINK>
    </EXPERIMENT_LINKS>
    <EXPERIMENT_ATTRIBUTES>
      <EXPERIMENT_ATTRIBUTE>
        <TAG>GEO Accession</TAG>
        <VALUE>GSM2254605</VALUE>
      </EXPERIMENT_ATTRIBUTE>
    </EXPERIMENT_ATTRIBUTES>
  </EXPERIMENT>
  <EXPERIMENT alias="GSM2254606" accession="SRX1985080">
    <IDENTIFIERS>
      <PRIMARY_ID>SRX1985080</PRIMARY_ID>
      <SUBMITTER_ID namespace="GEO">GSM2254606</SUBMITTER_ID>
    </IDENTIFIERS>
    <TITLE>GSM2254606: 20YoungWT4Cork; Populus tremula x Populus alba; RNA-Seq</TITLE>
    <STUDY_REF accession="SRP080128" refname="GSE84951">
      <IDENTIFIERS>
        <PRIMARY_ID>SRP080128</PRIMARY_ID>
      </IDENTIFIERS>
    </STUDY_REF>
    <DESIGN>
      <DESIGN_DESCRIPTION/>
      <SAMPLE_DESCRIPTOR accession="SRS1590209">
        <IDENTIFIERS>
          <PRIMARY_ID>SRS1590209</PRIMARY_ID>
          <EXTERNAL_ID namespace="GEO">GSM2254606</EXTERNAL_ID>
        </IDENTIFIERS>
      </SAMPLE_DESCRIPTOR>
      <LIBRARY_DESCRIPTOR>
        <LIBRARY_STRATEGY>RNA-Seq</LIBRARY_STRATEGY>
        <LIBRARY_SOURCE>TRANSCRIPTOMIC</LIBRARY_SOURCE>
        <LIBRARY_SELECTION>cDNA</LIBRARY_SELECTION>
        <LIBRARY_LAYOUT>
          <SINGLE/>
        </LIBRARY_LAYOUT>
        <LIBRARY_CONSTRUCTION_PROTOCOL>Total RNA was extracted from 1 g tissue from each. Each sample was mechanically ground in liquid nitrogen until a fine powder was obtained. To this tissue 3 % insoluble polyvinylpyrrolidinone (PVPP) was added and further ground in an extraction buffer containing 2% hexadecyltrimethylammonium bromide (CTAB), 2.0 M sodium chloride, 0.5 g/L spermidine, 100 mM Tris-HCl, 25 mM EDTA and 3% ß-mercaptoethanol pre-warmed to 65 °C. The mixture was then incubated at 65 °C for 10 minutes before extraction with 24:1 chloroform:isoamyl alcohol. The RNA was precipitated by the addition of ¼ volume 10 M LiCl, incubation at 4 °C for 6 hours followed by incubation at -20 °C overnight. The RNA was then harvested by centrifugation (10 000 x g) at 4 °C for one hour, removing aqueous phase, and washing in 70 % ethanol. Pellets were dried, re-dissolved in RNase- free water, and stored at -80 °C until use. Unstranded RNA protocol</LIBRARY_CONSTRUCTION_PROTOCOL>
      </LIBRARY_DESCRIPTOR>
    </DESIGN>
    <PLATFORM>
      <ILLUMINA>
        <INSTRUMENT_MODEL>Illumina HiSeq 2000</INSTRUMENT_MODEL>
      </ILLUMINA>
    </PLATFORM>
    <EXPERIMENT_LINKS>
      <EXPERIMENT_LINK>
        <XREF_LINK>
          <DB>gds</DB>
          <ID>302254606</ID>
        </XREF_LINK>
      </EXPERIMENT_LINK>
    </EXPERIMENT_LINKS>
    <EXPERIMENT_ATTRIBUTES>
      <EXPERIMENT_ATTRIBUTE>
        <TAG>GEO Accession</TAG>
        <VALUE>GSM2254606</VALUE>
      </EXPERIMENT_ATTRIBUTE>
    </EXPERIMENT_ATTRIBUTES>
  </EXPERIMENT>
</EXPERIMENT_SET>
