Genetic Diversity Analysis for Drought Tolerance and Productivity Traits Among Advanced Lines of Rabi Sorghum [Sorghum bicolor (L.) Moench]
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Date
2016-06
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University of Agricultural Science, Dharwad
Abstract
The study was conducted to assess the magnitude of genetic diversity and variability for drought tolerance and productivity traits among sorghum genotypes involving 100 advanced lines and 20 checks, that were evaluated in a RBD design during Rabi 2015-16 at Regional Agricultural Research Station, Vijayapura.
D2 analysis grouped the 120 genotypes into 10 clusters. Among 10 clusters, cluster I was the largest with 69 lines, followed by cluster III (22 lines), cluster II (14), cluster V (7), cluster VII (3). Remaining clusters, viz., IV, VI, VIII, IX and X were solitary in nature. The inter cluster distance varied from 5.73 to 19.79 (between VI and VII). Based on the overall scores across the clusters, highest ranking was recorded by cluster IV (rank 1) followed by X (rank 2), III (rank 3), VI (rank 4) and I (rank 5). The genotypes of the clusters can be extensively used for further breeding programme. Genetic diversity study indicated that among various characters studied, the maximum contribution towards divergence were recorded by leaf glossiness (48.32%) and lodging (32.69%) followed by days to 50% flowering (3.78%), panicle length (2.72%), charcoal rot (2.49%), number of primaries per plant (1.61%) and SPAD at physiological maturity (1.11%).
Under normal date of sowing, the high yielding entries that were also recorded superiority for drought tolerance parameters were DDSV54, PVCSG-3, PVBRJ-2, PVPK-1. The early entries CRCG-11 and CRSG-12 were recorded with reduced charcoal rot (%). The genotypes which showed high values for drought tolerance parameters under delayed sowing were DDSV54, SPV 2217, PRCSV-1 and DSPV5-1, P. Anuradha, PRBRJ-2 and PRBRJ-4.
High or moderately high heritability and high genetic advance estimates were observed for traits leaf glossiness, lodging (%), charcoal rot (%), grain yield per plant and grain number per plant under both normal and delayed date of sowing.
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