Evaluation of F3 and F4 populations of HJ 513 x IS 2205 of forage sorghum for morphological & biochemical traits related to stem borer (Chilo partellus) resistance
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Date
2021-07
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CCSHAU, Hisar
Abstract
The present study was conducted with 200 SB lines of cross HJ 513 x IS 2205 in augmented design during Kharif 2017 and 2018 at research area of forage section, dept. of Genetics and Plant Breeding, CCS Haryana Agricultural University, to evaluate, categorize and classify them for fodder yield and stem borer resistance related traits. Observations were recorded on 23 variables involving 22 morpho-biochemical and one qualitative character. All the 200 SB lines studied exhibited wide range of mean values for all quantitative characters except leaf stem ratio. High PCV and GCV along with high heritability and genetic advance as percent of mean while in F3 & F4 population for traits viz., fodder yield per plot, dry yield per plot, stem diameter, dead heart after 35 & 45 days after emergence, stem tunneling, TSS, phenol, tanin and HCN recorded high PCV and GCV along with high heritability and genetic advance as percent of mean, PCV was higher than the GCV for all the traits denoting environmental factors influencing their expression to some degree. Correlation analysis revealed that traits viz., tannin , phenol and dry fodder yield have shown highly significant positive correlation with green fodder yield per plot while, significant correlation with green fodder yield per plot was observed with traits like crude protein, IVDMD, TSS, stem tunnelling and plant height. GFY was negatively correlated with dead heart. Genetic divergence study grouped F3 & F4 populations into 10 clusters, among which cluster VI was the largest cluster (42 SB lines), followed by clusters VIII (29 SB lines) and I (25 SB lines). In F4 population maximum number of SB lines (34) was included in cluster I followed by (32) in cluster VIII, (27). SB line 60 and SB line 96 were repeated in both year so these SB lines could be promising parents for stem borer resistance. Therefore, inter-crossing of SB lines from these diverse clusters could be suggested to generate wide range of variability, which could be improved by selection in sorghum breeding programme.