Evaluation of an intra-arboreum recombinant inbred line population
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was undertaken to evaluate the performance of intra-arboreum recombinant inbred lines (RILs) for various quantitative traits and to unravel molecular diversity among a subset of RILs. These two sets including 62 (Set I) and 34 (Set II) RILs along with parent LD 902 and standard check LD 949 were evaluated in a simple lattice design at three locations (Ludhiana, Bathinda, and Faridkot) during kharif 2016. Mean squares for genotypes, locations, and genotype x environment interaction were significant for all the characters except for genotype mean squares for elongation percentage and location mean squares for fibre strength in Set I and location mean squares for micronaire and fibre strength in Set II. The results suggested existence of substantial genetic variability in the experimental plant material, considerable differences among the locations, and profound effect on the expression of seed cotton yield, its components and fibre quality traits. Three RILs namely 431, 241, and 217 in Set I and RIL 105 in Set II significantly out yielded parent LD 902. RIL 105 of Set II appeared to be promising as it recorded numerically higher seed cotton yield than that of LD 949. It also recorded higher values for some of the yield component traits such as number of bolls plant-1, sympods plant-1, and boll weight. Twenty seven RILs of Set I registered significantly higher boll weight than that of LD 949. Ten RILs of Set I and five RILs of Set II possessed at least 18 g/tex fibre strength. Likewise, many transgressive segregants were identified for various traits. Based on SSR diversity analysis of 64 genotypes, RILs were broadly divided into three main clusters. No specific pattern for grouping of genotypes was observed. Substantial variation as revealed by dissimilarity coefficient (0.03 – 0.46) has been observed among different pairs of desi cotton recombinant inbred lines. Further, 29 pairs of RILs recorded at least 0.4 value of the genetic dissimilarity coefficient. The present study has provided a useful insight into performance of desi cotton RILs for various economic traits over locations as well as shed light on the molecular diversity/similarity among the test genotypes.
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