PHYSIOLOGICAL INVESTIGATIONS ON STAY GREEN TRAIT IN RABI SORGHUM
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Date
2004
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University of Agricultural Science, Dharwad
Abstract
"A field experiment was conducted during rabi, 2003-04 at Main Agricultural
Research station, University of Agricultural Sciences, Dharwad to assess rabi sorghum
genotypes for their stay-green trait under varied irrigation levels and its impact on yield
and yield components.
The irrigation levels and genotypes differed significantly for various morphophenological
characters. The genotypes, DSV-4 and M-35-1 recorded maximum plant
height. The irrigation applied at both 50% flowering and grain filling stage took longer
days to maturity and grain filling and recorded higher grain yield. The genotype, DSV-4
recorded the maximum leaf, stem, panicle and total dry matter at all the growth stages
and yielded more.
The genotype, RSLG-262 recorded higher chlorophyll content at 50% flowering
and 15 DAF, whereas, at 30 DAF higher chlorophyll content was maintained by
DSV-4 and E-36-1, which also had higher LAD and green leaf area at maturity even
under no irrigation (control) condition indicating their stay green trait. The irrigation
levels had significant effect in maintaining higher LAI and LAR. Among the genotypes,
DSV-4 and E-36-1 maintained higher value of LAI and LAR even at maturity.
Maintenance of higher total soluble sugar and nitrogen content in leaf and stem
in genotypes, DSV-4 and E-36-1 at all the stages indicates their stay green trait as a
drought tolerant character, which had a yield advantage under un-irrigated condition.
The irrigation given at different stages decreased the leaf sugar content, whereas, it
increased the stem sugar content.
The maximum yield was recorded by irrigation given at both 50 per cent
flowering and grain filling stage. Among the genotypes, SPV-86 recorded higher grain
yield under irrigated condition, whereas, the stay green genotypes E-36-1 and DSV-4
out yielded the other genotypes under un-irrigated control. The maximum harvest
index was observed in E-36-1 and C-43."
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