“ANALYSIS OF GENETIC VARIABILITY FOR YIELD AND QUALITY CHARACTERS IN AROMATIC ADVANCED BREEDING LINES OF RICE (Oryza sativa L.)”
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Date
2011
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The experiment was conducted at Research Farm, Department of Genetics and Plant Breeding, College of Agriculture, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.) during kharif 2010 to assess the agromorphological characterization, genetic variability, association analysis and genetic divergence among the ninety eight aromatic advanced breeding lines of rice along with popular standard checks namely Indira Sugandhit Dhan-1, Pusa Basmati-1, Badsha bhog, Dubraj, Chinnor, Mahisugandha and Kalanamak. The mean sum of squares due to the genotypes were highly significant for all the characters studied namely, Days to 50 percent flowering, Plant height, Panicle length, Total tillers per plant, Effective tillers per plant, Filled spikelets per panicle, Unfilled spikelets per panicle, Total spikelet’s per panicle, Paddy length, 100 seed weight, Grain yield per plant, Paddy breadth, Spikelet sterility percentage, Paddy L/B ratio, Hulling %, Brown Rice Length, Brown Rice breadth, Brown Rice L/B ratio, Milling %, Kernel length, Kernel breadth, Kernel L/B ratio, Elongation Index, Kernel breadth after cooking, Cooked Kernel L/B ratio, Elongation ratio and Kernel length after cooking. The high estimate of phenotypic and genotypic coefficient of variation was observed from Unfilled spikelets per panicle, Filled spikelets per panicle, Total spikelets per panicle, Spikelet sterility percentage, and Grain yield per plant and Brown rice breadth. High heritability with high genetic advance was found for number of Total spikelets per panicle and Filled spikelets per panicle. Grain yield per plant was positively and significantly associated with 100 seed weight, Total effective tillers per plant, Filled spikelets per panicle and Total spikelets per panicle. The path analysis revealed that Panicle length, Effective tillers per plant, Filled spikelets per panicle, Spikelet sterility percentage and 100 seed weight had high and positive direct effect on Grain yield per plant. Based on cluster analysis breeding lines were grouped into 8 clusters. The highest numbers of breeding line were in cluster III, II and VI. The maximum intra cluster distance was shown by cluster VIII and maximum inter cluster distance was observed between cluster IV and cluster VII. In the study of quality traits it was found that most of genotypes showed high hulling percentage and milling percentage. High variation for characters viz., Kernel length after cooking (KLAC), Length: Breadth ratio of cooked rice, Elongation ratio and Elongation index was also recorded. Based on aroma, the genotypes were classified into highly scented, mild scented and non scented groups. Gelatinization temperature was scored into three grades in terms of Alkali spreading value.
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138 p.