Summary
Heterosis for yield and four yield components, viz. panicle number per plant, panicle length, spikelet per panicle and 1000-grain weight, was studied in fifteen crosses involving six varieties of rice, Oryza sativa L. Positive and significant heterosis for yield was observed in 11 and 8 crosses, over the mid-parent and the better parent, respectively. Hamsa x Hybrid 27 gave the highest heterosis both over the mid-parent (156.23%) and the better parent (136.38%) followed by Jaya x Norin 18 with respective values of 155.18 and 56.29%.
As compared with the average yield of 36.54 g per plant of the high yielding commercial variety, viz. Jaya hybrids in 8 crosses gave significant higher yield and four crosses, viz. Hamsa x Hybrid 27, Hybrid 27 x Jhona 349, Jaya x Palman 579 and Jaya x Hybrid 27, gave 80.51, 66.56, 57.11 and 56.30 g per plant, recording an increase of 120.33, 82.13, 56.29 and 54.08%, respectively. The heterosis for yield was due to simultaneous heterosis for a number of yield components. The possibility of hybrid crop production as compared with the recently developed high yielding rice varieties has also been discussed.
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Contribution No. 73.15 from the Department of Plant Breeding, Punjab Agricultural University, Ludhiana, India.
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Saini, S.S., Kumar, I. & Gagneja, M.R. A study on heterosis in rice (Oryza sativa L.). Euphytica 23, 219–224 (1974). https://doi.org/10.1007/BF00035861
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DOI: https://doi.org/10.1007/BF00035861