Genetic analysis of yield and yield contributing characters in rice (Oryza sativa L.) under sodic soil
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Date
2020-09-15
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ANDUAT, kumarganj, Ayodhya
Abstract
The present investigation entitled “Genetic analysis of yield and yield contributing characters in rice (Oryza sativa L.) under sodic soil” was carried out with 4 sets of crosses (NDRK 5004 x NUD 3, Pant10 x IR 28, CSR 10 x NUD 3, Sushk Samrat x IR 28) for seventeen quantitative traits during the Kharif 20017-19 at Student‟s Instructional Farm of Narendra Deva University of Agriculture and Technology, Narendra Nagar (Kumarganj), Ayodhya-224229 (U.P.), India Six genetic populations (P1, P2, F1, F2, B1 and B2) of above four crosses were evaluated in Randomized Complete Block Design with three replications in sodic soils. The present investigation was undertaken (i) to test the adequacy of „additive-dominance model‟ in inheritance of various characters using simple scaling test and joint scaling test. (ii) to workout heritability and genetic advance in per cent of mean for different characters (iii) to study the nature and magnitude of gene effect controlling for yield, yield components and some other important characters, (iv) to estimate heterosis and inbreeding depression for yield and yield attributes, (v) to examine the nature and magnitude of inter-relationships between different characters and (vi) to find out direct and indirect effects of yield contributing traits on seed yield using path-coefficient analysis. Observation were recorded on seventeen quantitative traits viz., days to 50% flowering, day to maturity, chlorophyll content, leaf temperature, Flag leaf area, Plant height, Panicle bearing tillers/plant, Panicle length, Spikelet/panicle, Grains/panicle, Spikelet fertility, Biological yield/plant, Harvest index, 1000-grain weight, protein content and grain yield per plant. The data on sixteen metric traits from were subjected to analysis of variance of Randomized Complete Block Design, separately, simple and joint scaling tests and six parameter models of generation mean were used to study the nature and magnitude of gene effects for seventeen traits of four crosses. Heterosis was estimated over standard variety (NUD 3), better parent and inbreeding depression was studied for understanding the manifestation of heterosis in different crosses. Heritability in broad sense, narrow sense and expected genetic advance in per cent of mean were computed to assess the efficiency of selection in improving the characters.
Analysis of variance of Randomized Complete Block Design revealed significant differences among the families for all the seventeen characters in the four crosses. Significant differences among the progenies within each family for all the seventeen characters were also observed. Simple and joint scaling tests indicated presence of epistatic interaction and fitness of digenic interaction model for all the seventeen characters in the four crosses. Out of 64 cases, all cases showed significance of epistasis which was detected by either one or both type of scaling tests for all the characters. Both tests, simple and joint scaling tests led to similar inferences in respect of presence or absence of epistasis in majority of cases for seventeen characters in four crosses.
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