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

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Relation http://oar.icrisat.org/2590/
 
Title Evaluation of sorghum genotypes for the stay-green trait and grain yield
 
Creator Reddy, B V S
Ramaiah, B
Ashok Kumar, A
Reddy, P S
 
Subject Sorghum
 
Description 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.
 
Publisher International Crops Research Institute for the Semi-Arid Tropics
 
Date 2007
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/2590/1/Evaluation_of_sorghum.pdf
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.