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Nitrogen metabolism in relation to water stress. Chapter 19

By: Contributor(s): Material type: TextTextPublication details: 1987ISBN:
  • 0-471-91650-1
Subject(s): DDC classification:
  • 94-097606
 In: Srivastava, J.P.; Acevedo,-E.; Varma,-S. (ICARDA, Aleppo (Syria)); Porceddu,-E. (University of Tuscia, Viterbo (Italy). Inst. of Agricultural Biology) (eds.). National Research Council of Italy, Viterbo (Italy); International Center for Agricultural Research in the Dry Areas, Aleppo (Syria). Drought tolerance in winter cereals: proceedings of an international workshop. Chichester (United Kingdom). John Wiley and Sons. 1987. p. 241-253Summary: The role of nitrate and organic nitrogen compounds in relation to water and also aspects of nitrogen acquisition, biosynthesis, and cycling is considered. Both laboratory- and field-grown plants (on a line-source sprinkler) for metabolites, such as nitrate, proline, and other amino acids are analyzed. In the barley varieties tested these all increase in concentration with increased water deficit. Such compounds are thought to act as osmoticants. Total reduced nitrogen also increases in drought-stressed plants, and the so-called drought susceptibility of nitrate reductase was questioned. The quantitative changes of amino acids in stressed barley have been used to construct a metabolic index of stress which correlates very well with rates of water loss from leaves. This may be useful in characterizing the susceptibility of plants to drought stress
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Reprint CIMMYT Knowledge Center: John Woolston Library AGRIS Collection 94-097606 (Browse shelf(Opens below)) Available
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1 tables; 9 fig. 12 ref. Summary (En)

The role of nitrate and organic nitrogen compounds in relation to water and also aspects of nitrogen acquisition, biosynthesis, and cycling is considered. Both laboratory- and field-grown plants (on a line-source sprinkler) for metabolites, such as nitrate, proline, and other amino acids are analyzed. In the barley varieties tested these all increase in concentration with increased water deficit. Such compounds are thought to act as osmoticants. Total reduced nitrogen also increases in drought-stressed plants, and the so-called drought susceptibility of nitrate reductase was questioned. The quantitative changes of amino acids in stressed barley have been used to construct a metabolic index of stress which correlates very well with rates of water loss from leaves. This may be useful in characterizing the susceptibility of plants to drought stress

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