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Study of Relationship between Carbohydrate components of Stem and Survival % by Genetic correlation and Path analysis for Submergence Tolerance in Rice (Oryza sativa L.)

Author Affiliations

  • 1Department of Genetics and Plant Breeding, Institute of Agricultural Science, University of Calcutta, 51/2 Hazra Road. Kolkata -700019, West Bengal, India
  • 2Department of Genetics and Plant Breeding, Institute of Agricultural Science, University of Calcutta, 51/2 Hazra Road. Kolkata -700019, West Bengal, India

Res. J. Recent Sci., Volume 5, Issue (8), Pages 1-10, August,2 (2016)

Abstract

Fifty paddy genotypes along with four tolerant and three susceptible checks were assessed for study of genetic correlation and path analysis between carbohydrate components of stem viz. total carbohydrate, non structural carbohydrate (NSC), starch and soluble sugar contents with survival% both in before and after submergence for ten days old seedlings and four days of complete submergence under drum and pot screening method. Genotype like Mahananda exhibited highest amount of NSC % of stem both in before & after submergence with 80% of survival. For the soluble sugar, sucrose% was higher among other components viz. glucose and fructose. Bivariate analysis of simple genetic correlation showed that all the four characters both in before and after submergence are significantly correlated with survival% at 0.01 and 0.05 probability level respectively. Genetic correlation among soluble sugars components of stem was significantly positive with survival % both in before and after submergence. Path analysis showed that it was only non structural carbohydrate %, soluble sugar % and starch % of stem after submergence has positive direct effect on survival%. Soluble sugar % has positive direct effect on survival both in before and after submergence. Total carbohydrate % of stem both in before and after submergence has negative effect on survival. Retention of higher NSC % after submergence would be the one of the most important criteria for better regeneration after submergence. Selection of specific characters such as NSC % and soluble sugar % of stem in pre vegetative stage will be the key to biochemical screening for submergence tolerance in rice.

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