Evaluation of sorghum genotypes for the stay-green trait and grain yield

    Reddy, B V S and Ramaiah, B and Ashok Kumar, A and Reddy, P S (2007) Evaluation of sorghum genotypes for the stay-green trait and grain yield. Journal of SAT Agricultural Research, 3 (1). pp. 1-4.

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    Abstract

    Sorghum (Sorghum bicolor) is one of the major cereal crops in the semi-arid tropics where prolonged droughts are frequent. Water deficit is the major constraint to rainfed sorghum production worldwide. In India sorghum is primarily cultivated in two distinct seasons: June to October (rainy/kharif) and October to February (postrainy/rabi). The postrainy season crop is grown mostly on stored soil moisture on Vertisols over 5 million ha of the Deccan Plateau situated between 16° and 20° N and 74° and 80° E. Sorghum grain yields are increasing during the rainy season but have remained the same in postrainy season (Vidyabhushanam 1986). In postrainy season sorghum, fodder quality may suffer due to senescence as the crop is grown on residual moisture and often experiences severe terminal drought stress. Staygreen or non-senescence is an important trait associated with drought tolerance (Rosenow 1977). It is indicated by maintenance of green stems and upper leaves when water is limiting during grain filling. Sorghum genotypes with the stay-green trait continue to fill their grains normally even under limited water or moisture stress conditions (Duncan et al. 1981, Rosenow and Clark 1981, Borrell et al. 2000). Delaying the onset of leaf senescence and reducing its rate (ie, two components of the stay-green trait) offer an effective strategy for increasing grain production, fodder quality and grain crop residues particularly under water limited conditions. This article describes the effect of the stay-green trait on grain yield of 38 sorghum stay-green genotypes.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Sorghum
    Depositing User: Library ICRISAT
    Date Deposited: 27 Oct 2011 08:37
    Last Modified: 11 Nov 2011 09:23
    URI: http://oar.icrisat.org/id/eprint/2590
    Official URL:
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: UNSPECIFIED
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