Indian Society of Genetics & Plant Breeding

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HETEROSIS BREEDING FOR GRAIN YIELD AND OTHER AGRONOMIC CHARACTERS IN RICE (ORYZA SATIVA L.)

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Thirty six hybrids evolved from nine high yielding and widely adapted cultivars were
evaluated with parental lines and the standard variety, Jaya, to determine the nature and
extent of heterosis for seven characters including grain yield per plant. Most of the crosses
manifested significant heterosis for grain yield and panicle number per plant, panicle
length, lOOo-grain weight, grains per panicle, and days to maturity. Very few hybrids
manifested significant heterosis for plant height. The range of heterosis for seed yield per
plant was - 96.7 to 258.20/. over the better parent, - 96.1 to 268.2% over midparent and - 96.3
to 301.6% over the standard variety. The highest heterotic effects for grain yield were
observed in the crosses Prasad x PP 72, Govind x PP 72, Govind x Sita, Prasad x Mahsuri
and Govind x Jaya hybrids, which was, respectively, 258.2, 216.8, 177.8, 161.6 and 108.80/.
over betterparent, 268.2, 250.8,178.1, 204.2and 119.4%overmidparent,and 301.6,255.2, 151.6,
285.0 and 108.8% over the best check variety Jaya. A comparison between heterotic and
nonheterotic hybrids for yield and its components indicated that heterosis for grain yield
was due to two or more direct yield contributing characters. Implications of the nature and
magnitude of heterosis for commercial exploitation in rice are discussed.
 

Keywords: Oryzn sativa, standard heterosis, seed yield, yield components, hybrid rice

Info

Year: 1995
Volume: 55
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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