Drought resistance of Sorghum bicolor. 6. Changes in endogenous growth regulators of plants grown across an irrigation gradient

    Kannangara, T and Durley, R C and Simpson, G M and Seetharama, N (1983) Drought resistance of Sorghum bicolor. 6. Changes in endogenous growth regulators of plants grown across an irrigation gradient. Canadian Journal of Plant Science, 63 (1). pp. 147-155. ISSN 1918-1833

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    Abstract

    A gradient of water stress was created among sorghum plants with a line-source sprinkler irrigation system. Changes in endogenous growth regulators, leaf water potential (ψw), solute potential (ψs), leaf conductance, leaf temperature, leaf senescence, leaf area and plant height were monitored. Abscisic acid (AbA) levels were increased and phaseic acid (PA) levels were reduced under stress. IAA levels could not be related to stress. Leaf ψw, leaf ψs and leaf conductance were reduced and leaf temperature was increased by water stress. Leaf area development was more sensitive to stress than stem elongation. Linear correlations between irrigation, AbA, leaf ψw, leaf ψs and plant height were high (r > 0.9). The correlation between AbA and grain yield (r = − 0.65) was similar to that between irrigation and grain yield (r = 0.68), but opposite in sign. Leaf AbA content measured during early growth could thus be used to predict grain yield under a given irrigation regime.Key words: Abscisic acid, phaseic acid, indole-3-acetic acid, water stress, grain yield, sorghum

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Abscisic acid, phaseic acid, indole-3-acetic acid, water stress, grain yield, sorghum
    Subjects: Mandate crops > Sorghum
    Depositing User: Ms K Syamalamba
    Date Deposited: 10 Jul 2013 08:34
    Last Modified: 21 Apr 2014 05:31
    URI: http://oar.icrisat.org/id/eprint/6924
    Official URL: http://dx.doi.org/10.4141/cjps83-013
    Projects: UNSPECIFIED
    Funders: International Development Research Centre, Ottawa, Canada
    Acknowledgement: UNSPECIFIED
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