VARIABILITY OF YIELD ATTRIBUTES AND QUALITY TRAITS IN ADVANCED LINES OF FINE RICE (Oayza sativa)

Abstract

The experiment was conducted in the experimental Farm. Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from July to December 201110 study the variability of yield attributes and quality traits in advanced lines of fine rice (Oryza saliva). Seven newly developed lines of fine rice variety were used as the test crop for this study. They were S-I, 8-2. 8-5, AI.-33(II), AL-36, AL-42(II). AL-44(I) and Chinigura. The experiment was laid out in Randomized Complete Block Design with three replications. The longest plant height (137.35 cm) was observed in Chinigura, whereas the shortest plant height (106.00 cm) was found in 8-2 lines. The highest grain yield per hectare (6.34 ton) was recorded in 8-2, while the lowest yield per hectare (4.98 ton) in AL-33(11). Genotypic and phenotypie variance, heritability, genetic advance and genetic advance in percentage of mean were estimated for different newly developed advanced fine rice lines and check. Grain yield per plant of newly developed advanced fine rice lines and check showed positive association in respect of number of effective tillers/hill (0.308), number of filled spikelets/panicle (0.110) and weight of 1000-grains (0.109), whereas significant negative association with panicle length (-0.609). number of unfilled spikelets/panicle (-0.542) and non significant negative association with plant height (-0.136) and number of ineffective tillers/hill (-0.304). Path analysis revealed that plant height had positive direct effect (0.154), number of effective tillers/hill had positive direct effect (0.065). number of ineffective tillers/hill had negative direct effect (-0.114). panicle length had positive direct effect (0.163), number of filled spikelets/panicle had positive direct effect (0.285), number of unfilled spikelets/panicle had negative direct effect (-0.154), weight of 1000-grains had positive direct effect (0.234) on grain yield per plant. The S-I, 8-2, 8-5, AL-33(11) and AL-44(l) lines showed higher hulling percent, milling percent but lower head rice recovery percent than the check Chinigura, because of their breakage during milling due to long grain. Among the studied lines all were long slender grains and superior cooking performance over Chinigura, all were superior for length of cooked rice elongation, kernel elongation ratio and volume expansion. The S-I, 8-2 and AL-42(11) lines showed low OT which take short time for cooking.