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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Effect of second-leaf removal or kinetin treatment on the nucleic acid metabolism of senescing first seedling leaf of barley</title><author><name sortKey="Srivastava, B I Sahai" sort="Srivastava, B I Sahai" uniqKey="Srivastava B" first="B. I. Sahai" last="Srivastava">B. I. Sahai Srivastava</name></author><author><name sortKey="Atkin, Roger K" sort="Atkin, Roger K" uniqKey="Atkin R" first="Roger K." last="Atkin">Roger K. Atkin</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">5650363</idno><idno type="pmc">1198671</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1198671</idno><idno type="RBID">PMC:1198671</idno><date when="1968">1968</date><idno type="wicri:Area/Pmc/Corpus">000050</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000050</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Effect of second-leaf removal or kinetin treatment on the nucleic acid metabolism of senescing first seedling leaf of barley</title><author><name sortKey="Srivastava, B I Sahai" sort="Srivastava, B I Sahai" uniqKey="Srivastava B" first="B. I. Sahai" last="Srivastava">B. I. Sahai Srivastava</name></author><author><name sortKey="Atkin, Roger K" sort="Atkin, Roger K" uniqKey="Atkin R" first="Roger K." last="Atkin">Roger K. Atkin</name></author></analytic><series><title level="j">Biochemical Journal</title><idno type="ISSN">0264-6021</idno><idno type="eISSN">1470-8728</idno><imprint><date when="1968">1968</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>1. Changes in nucleic acid metabolism in first seedling leaves of barley plants during aging (from 7 to 27 days) were followed, and the effect of continual removal of the second leaf and basal meristem or of treating the first leaf with 20p.p.m. kinetin on these changes was examined. During aging of the first seedling leaves the ribosomal RNA, DNA and soluble RNA declined, with ribosomal RNA showing the most rapid fall. This was, however, accompanied by increased incorporation of <sup>32</sup>P into RNA, which reached its peak on the fifteenth day. 2. Second-leaf removal partially suppressed first-leaf senescence as judged by retarded chlorophyll and nucleic acid decline and by a decreased extent of RNA labelling. Treatment with kinetin, however, did not prove effective. 3. No significant differences in the sucrose-gradient pattern of <sup>32</sup>P-labelled nucleic acids or in the <sup>32</sup>P-labelled nucleotide composition of RNA fractions during aging or during the two treatments were noted, except for a decrease in CMP content of soluble RNA during aging. 4. The results demonstrate that important changes in RNA metabolism are associated with leaf senescence.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Biochem J</journal-id><journal-title>Biochemical Journal</journal-title><issn pub-type="ppub">0264-6021</issn><issn pub-type="epub">1470-8728</issn></journal-meta><article-meta><article-id pub-id-type="pmid">5650363</article-id><article-id pub-id-type="pmc">1198671</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Effect of second-leaf removal or kinetin treatment on the nucleic acid metabolism of senescing first seedling leaf of barley</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Srivastava</surname><given-names>B. I. Sahai</given-names></name></contrib><contrib contrib-type="author"><name><surname>Atkin</surname><given-names>Roger K.</given-names></name></contrib></contrib-group><aff id="af1">Roswell Park Memorial Institute, New York State Department of Health, Buffalo, N.Y. 14127, U.S.A.</aff><pub-date pub-type="ppub"><month>04</month><year>1968</year></pub-date><volume>107</volume><issue>3</issue><fpage>361</fpage><lpage>366</lpage><abstract><p>1. Changes in nucleic acid metabolism in first seedling leaves of barley plants during aging (from 7 to 27 days) were followed, and the effect of continual removal of the second leaf and basal meristem or of treating the first leaf with 20p.p.m. kinetin on these changes was examined. During aging of the first seedling leaves the ribosomal RNA, DNA and soluble RNA declined, with ribosomal RNA showing the most rapid fall. This was, however, accompanied by increased incorporation of <sup>32</sup>P into RNA, which reached its peak on the fifteenth day. 2. Second-leaf removal partially suppressed first-leaf senescence as judged by retarded chlorophyll and nucleic acid decline and by a decreased extent of RNA labelling. Treatment with kinetin, however, did not prove effective. 3. No significant differences in the sucrose-gradient pattern of <sup>32</sup>P-labelled nucleic acids or in the <sup>32</sup>P-labelled nucleotide composition of RNA fractions during aging or during the two treatments were noted, except for a decrease in CMP content of soluble RNA during aging. 4. The results demonstrate that important changes in RNA metabolism are associated with leaf senescence.</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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