Vol. 7 No. 1
Physio-biochemical markers for selecting water logging tolerant mulberry genotypes.
Author(s): S. K. SIL, P. D. GHOSH AND M. K. GHOSH
Abstract: Water logging not only restricts soil aeration but also lemuts growth of the root system .. stmulates toxic metabolism .. disturbs hormone Metabolism and prevents the normal functioning resulli11g in reduction in leaf yield and quality of mulberry . Under prolonged water stagnation heavy mortality occurs. To overcome this problem one important way is to develop mulberry genotypes which have higher potential to tolerate flood water logging condition. Accordingly. to chalk our a hybridization programme, response of a total of 120 genotypes was studied qfier simulating the plants under water-logged condition for 15 days. Various relevant physio-b1ochemical traits were measured vi. net photosynthetic rate (NPR) . nitrate reductase activity (NRA) chlorophyll content, soluble protein content. abscisic acid (ABA) and membrage stability. Attempt was made to identify important economic characters and physiological traits susceptible to high moisture stress. Three physiological traits: :VRA, membrane stability and ABA content. irere identified as the most important traits lo select the flood water logged condition tolerant mulberry genotypes. Correlation studies revealed signijicant positive correlations between economically \'important paramlter leaf yield in stress condition. 1r1th three physiological parameters; NRA. abscis1c acid content and membrane stability expressing highest r value ol 0. 72 with ABA. On the basis of overall findings. a total of 15 parents, comprising .4 male and 11 female genotypes . were selected as promising parents for taki11g up breeding progra111me to develop F1 pmgenies.
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