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Subject: Genetics and Plant Breeding × Author: Bisht, Surinder Singh × End date: 2009 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Variability among Rm-Ts gene complex recombinant lines for spike forms, grain yield and its attributes in wheat (Triticum aestivum L. em. Thell)
    (CCSHAU, 2005) Bisht, Surinder Singh; Redhu, A.S.
    The present study was carried out with the objective to evaluate the impact of supernumerary spikelet traits, governed by Rm (remifera) and Ts (tetrastichon) genes, on spike features and other morphological and productivity traits. The present study was resolved in two sets of experiments. In experiment 1, variability among various Rm-Ts complex lines, single row plot of 2 meter length placed at 23 cm between rows and 10 cm within rows of 37 genotypes and in experiment 2, similarities/ dissimilarities among different Rm-Ts forms, seven parents viz. SG 15, SG 22, SG 70, SG 215, SG 8809, HD 2009 M and SM 6 with their 21 F1’s are grown in a same layout as in experiment 1. For experiment 1, the mean data on five randomly selected plants of each genotype in each replication were subjected to various statistical analyses. The observations on various morphological and productivity traits revealed that there has been a definite impact of Rm-Ts genes on peduncle diameter, spike length, spikelet/ spike, grain/ spike and spike productivity as the mean performance of these characters was improved in most of the lines over the normal commercial varieties. In most of the lines there has been increase in the grain number per spike with grain weight and spike productivity similar or more to the latest released semi-dwarf cultivars resulting in higher grain yield per spike in same lines. The Rm-Ts gene has created enormous amount of variability for spikelet/spike, grain/ spike, biological yield/ plant and grain yield per plant as reflected in higher coefficients of variations for these traits. The estimates of genetic advance were also high for these characters. In experiment 2, spikes of F1’s showed differences in their colours and forms that shows the impact of Rm-Ts gene complex on spike forms.