Pulses play a vital role in providing nutrition to billions of individuals globally. Improving yield in the urdbean faces a significant challenge due to its narrow genetic base and limited exploitable variation. This research explores the genetic variability, heritability, and genetic advance among 111 diverse lines of urdbean. 27 lines, three testers, and Eighty-one F1 hybrids were grown in a Randomized Block Design (RBD) with three replications during Kharif 2023 at the Crop Experimental Research Farm of Chandra Shekhar Azad University of Agriculture and Technology, Kalyanpur, Kanpur (U.P.). The analysis of variance for parents (27 lines and three testers) and their 81 triple test cross hybrids indicated highly significant genotypic differences across all traits under study. The PCV was higher compared to GCV for all the traits, While Maximum GCV and PCV were observed for primary branches per plant, number of pods per plant, seed yield per plant, biological yield per plant, and harvest index. Broad-sense heritability (h2b) was high for all the traits examined ranging from 73.27% to 98.05%. Further, high heritability coupled with high genetic advance as percent over mean were recorded for all the traits except day to 50% flowering, day to 75% maturity, and protein content, where high heritability is observed with moderate genetic advance. These findings suggest the involvement of additive genetic effects in shaping the inheritance of these traits and phenotypic selection of these characters would be effective for further breeding purposes. 

pdf/exploring-genetic-variability-parameters-for-yield-and-4hay3kivs5.pdf

Exploring Genetic Variability Parameters for Yield and Quality Traits in Urdbean Genotypes and Its Triple Test Cross F1 Hybrids

Genetic enhancement of reproductive stage drought tolerance in RPHR-1005R and derivative rice hybrids through marker-assisted backcross breeding in rice (Oryza sativa L.).

The experiment was conducted involving 89 genotypes of blackgram for genetic variability of 18 quantitative and qualitative traits at S.V. Agricultural College, Tirupati during Rabi, 2015-16. The analysis of variance (ANOVA) revealed existence of significant differences among the genotypes for all the characters studied. Among the genetic parameters PCV was higher than GCV for all the traits indicates the role of environment in expression of the characters. Higher estimates of genotypic coefficient of variation was observed for the traits tryptophan content, lysine content, methionine content, number of primary branches per plant, seed yield per plant, number of pods per plant and number of clusters per plant. High heritability accompanied with high genetic advance was observed for methionine content, tryptophan content, lysine content, number of clusters per plant, number of primary branches per plant, seed yield per plant, harvest index, number of pods per plant, carbohydrate content and plant height specified dominance of additive gene action in appearance of these traits and selection for these characters will be effective.

GENETIC VARIABILITY STUDIES FOR YIELD, ITS ATTRIBUTES AND QUALITY TRAITS IN BLACKGRAM [Vigna mungo (L.)]

Drought stress has become more important abiotic factor affecting rice yield under present changing climate conditions. IR58025B is a maintainer line of widely used WA CMS line IR58025A and widely used in commercial rice hybrids production in India. Most of the rice hybrids are released for the irrigated ecosystem consequently, these derived hybrids suffer drastic yield decline under moisture stress conditions. To facilitate the efficient use of complex polygenic traits in hybrid rice molecular breeding research, we undertook development of introgression lines in background of IR58025B with tolerance to moisture stress by introgression of major QTL qDTY3.1 controlling grain yield under moisture stress. The present study reports the development and evaluation of 230 introgression lines (BC2F2) lines in IR58025B background for improvement of grain yield under moisture stress condition. Among 230 ILs, 24 introgression lines were found positive for qDTY3.1 and negative for fertility restoration (rf4 & rf3).Promising BILs exhibited earliness of 7 days under moisture stress with grain yield advantage of 8.54g to 10.78g in comparison to the recurrent parent. This suggested that the efficacy of introgressed drought tolerant QTL qDTY3.1 in enhancing grain yield under moisture stress conditions. Further, breeding lines of IR58025B possessing qDTY3.1 could also serve as good donors for development of drought tolerant rice hybrids for unfavorable ecologies.

Marker assisted backcross breeding to develop the drought tolerant version of IR58025B, a popular maintainer line of hybrid rice

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GENETIC VARIABILITY STUDIES FOR YIELD, ITS ATTRIBUTES AND QUALITY TRAITS IN BLACKGRAM [Vigna mungo (L.)]

Marker assisted backcross breeding to develop the drought tolerant version of IR58025B, a popular maintainer line of hybrid rice