Vol. 16 No. 1
Heterosis studies for yield and physical quality traits in hybrid rice (Oryza sativa L.)
Author(s): S. BEGUM, V. RAM REDDY, B. SRINIVAS AND CH. ARUNAKUMARI
Abstract: Forty-two hybrids of rice were developed by crossing six CMS lines and seven testers in line x tester mating design for estimation of heterosis for yield and physical quality traits. The data was collected on days to 50 per cent flowering, plant height (cm), panicle length (cm), number of productive tillers per plant, number of grains per panicle, spikelet fertility percentage (%),1000- grain weight (g), grain yield per plant (g), hulling percentage, milling percentage, head rice recovery percentage, kernel length (mm), kernel breadth (mm), kernel L/B ratio, paddy length (mm), paddy breadth (mm) and paddy L/B ratio.The analysis of variance (line x tester) revealed significant differences among genotypes for all the characters studied. The hybrids JMS 19A X JR 80, JMS 19A X JBR 6, JMS 19A X JR 83, JMS 19A X JR 67 and CMS 64A X JMBR 44 recorded high grain yield per plant and had higher percentage of relative heterosis, heterobeltiosis and standard heterosis for majority of the traits. Testing of these hybrids in multilocation trials across different states of the country may result in the identification of better hybrids in the near future for commercial exploitation.
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