Identification of drought tolerant recombinant inbred lines derived from the cross NRCG 12568 × NRCG 12326 in groundnut (Arachis hypogaea L.) through seedling vigour, root studies and per se performance
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Date
2019-08-10
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK, BENGALURU
Abstract
The present study was carried out with an objective to identify drought tolerant recombinant inbred lines derived from the cross NRCG 12568 × NRCG 12326 in groundnut. Different strategies like field evaluation under well watered (WW) and water stress (WS) conditions, laboratory screening under moisture stress induced by standardized concentration of PEG-6000, drought tolerant indices based rank sum method and biplot analysis was employed to achieve this objective. The PEG-6000 concentration was standardized to -0.4 MPa for inducing WS in groundnut. Among the RILs evaluated for drought tolerance, RIL 125, 275 and 258 were found to be drought tolerant based on all the above approaches. The RILs 175, 101, 239 and 245 were identified as drought tolerant based on all the approaches except biplot analysis. The selected drought tolerant and susceptible RILs were subjected to root phenotyping under WW and WS conditions in specially constructed root structure. The association studies of root length, root length to shoot length ratio, root volume, root dry weight and root to shoot dry weight ratio with pod yield revealed a highly significant positive correlation under water stress condition. Also the above identified drought tolerant RILs found to have a well developed root system under WS condition. The increase in root length, root volume, root to shoot length ratio, root dry weight and root to shoot dry weight ratio helped the plants to draw water from dee