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The physiological basis for yield differences between four genotypes of groundnut arachis hypogaea in response to drought ii. solar radiation interception and leaf movement



The physiological basis for yield differences between four genotypes of groundnut arachis hypogaea in response to drought ii. solar radiation interception and leaf movement



Experimental Agriculture 24(2): 203-214



Four genotypes of groundnut grown with limited irrigation during the post-rainy season in Central India produced similar amounts of dry matter per unit of intercepted solar radiaction (e) before pod-filling, although different e values were observed during pod-filling. The relation between cumulative transpiration and intercepted radiation was similar for all genotypes. When drought became severe, fractional radiation inteception (f) was reduced by folding of leaves, with little decrease in leaf area (L). The ratio f/.sqroot.L was used as an index of the degree of leaf folding and was correlated with leaf water potential. The degree of folding varied with genotype and may have contributed to the observed differences in e and the dry matter:water ratio (q). The genotype EC76446(292) had the smallest q and largest f/.sqroot.L ratio (the poorest radiatioon avoidance), while Kadiri 3 had the largest q and smallest value of f/.sqroot.L.

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Accession: 006735238

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DOI: 10.1017/s0014479700015957


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