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University of Agricultural Sciences, Dharwad (2017)

Physiological indices for drought tolerance in rabi sorghum

Pawar K.N

Titre : Physiological indices for drought tolerance in rabi sorghum

Auteur : Pawar K.N.

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Doctor of Philosophy (PhD) 2017

Résumé
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.

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