Effects of Timing of Drought Stress on Leaf Area Development and Canopy Light Interception of Short-duration Pigeonpea

Lopez, F B and Chauhan, Y S and Johansen, C (1997) Effects of Timing of Drought Stress on Leaf Area Development and Canopy Light Interception of Short-duration Pigeonpea. Journal of Agronomy and Crop Science, 178 (1). pp. 1-7. ISSN 1439-037x

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Leaf area index (LAI), fractional canopy light interception (F) and plant mortality at maturity, were determined for nine short-duration Cajanus cajan genotypes in response to drought during the late-vegetative and flowering (stress 1), the flowering and early pod filling (stress 2), or pod filling (stress 3) stages. The crop was grown under rain shelters at Patancheru, Andhra Pradesh in 1988. LAI and F were reduced, but plant mortality did not increase under drought. Stress 2 reduced LAI to the greatest extent, consistent with the effects on seed yield. At the end of stress 1, seed yield was closely related to LAI for the different genotypes in stressed but not in unstressed (control) plots. Reductions in LAI due to reproductive growth were as great or greater than those due to water stress. Indeterminate genotypes had smaller but more leaves per plant compared with the determinate genotypes. The importance of these differences to drought resistance was not apparent. It was suggested that production of leaves with decreasing specific leaf area throughout plant growth may be advantageous, especially when drought is likely to occur during reproductive growth. Values of F during and following water stress gave an indication of genotypic drought resistance, with the most drought-sensitive genotype showing the largest reduction in F under water stress and the slowest rate of recovery following rewatering. It was concluded that for short-duration C. cajan, where plant mortality is not a factor under water stress, the maintenance of both LAI and F appears to indicate genotypic drought resistance.

Item Type: Article
Uncontrolled Keywords: Cajanus;pigeonpea;plant mortality;yield relationship
Subjects: Mandate crops > Pigeonpea
Depositing User: Library ICRISAT
Date Deposited: 26 Oct 2011 10:34
Last Modified: 26 Oct 2011 10:34
URI: http://oar.icrisat.org/id/eprint/2849
Official URL: http://dx.doi.org/10.1111/j.1439-037X.1997.tb00344...
Acknowledgement: UNSPECIFIED
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