Physiological indices for drought tolerance in rabi sorghum
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Date
2007
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UAS Dharwad
Abstract
Filed experiments were conducted at Main Agricultural Research Station, University
of Agricultural Sciences, Dharwad during rabi 2004-05 and 2005-06 to study the
Physiological indices for higher productivity under receding soil moisture situation on
various morpho-physiological, biochemical, biophysical and yield and yield components in
sorghum. The experiments were laid out in randomized block design with sixteen treatments
and three replications.
Among the genotypes, RSLG-262, Phule Yoshodha, PBS-2 and CRS-4 recorded
maximum leaf, stem, panicle and total dry matter at all the stages. The genotypes RSLG-262
and Phule Yoshodha maintained higher photosynthetic rate and lower transpiration rate
indicating their drought tolerance nature. The relative water content (RWC) was more in the
genotypes RSLG-262, Phule Yoshodha, PBS-2 and CRS-4 which indicated their drought
tolerance nature. These genotypes also recorded higher yield and yield components. Among
the growth parameters, significantly higher LA, LAI, SLW, LAD, NAR, CGR and BMD was
observed in genotypes RSLG-262, Phule Yoshodha, PBS-2 and CRS-4 as compared to other
genotypes.
The various biochemical parameters viz., chlorophyll ‘a’ chlorophyll ‘b’ total
chlorophyll, NRA, proline, epicuticular wax content was higher in genotypes RSLG-262,
Phule Yodhodha, PBS-2 and CRS-4 compared to all other genotypes.
Yield and yield components viz., panicle weight, 1000 grain weight, number of grains
per panicle, per day grain productivity, grain yield and harvest index were significantly
higher in RSLG-262, Phule Yashodha, PBS-2 and CRS-4 compared to Sigali Local and
Barasi zoot. Among the genotypes RSLG-262, Phule Yodhodha, PBS-2 and CRS-4 were
found physiologically efficient and possessed significantly higher values for all biophysical
and biochemical traits and these genotypes may be used as genetic source for drought
tolerance in sorghum.