HETEROSIS BREEDING IN RICE (ORYZA SATIVA L.) FOR QUANTITATIVE TRAITS
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Date
2019
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Plant Archives
Abstract
The magnitude as well as direction of heterosis over better parent and standard variety differed from character to character
depending upon cross combinations. The manifestation of heterosis for grain yield plant-1 is evident by significant superiority
of hybrids over better parent ranging from -54.69 to 139.43 per cent and over standard variety ranging from 60.35 to 22.64 per
cent. In general, the crosses which displayed superiority over better parent and standard variety for grain yield also exhibited
significant heterosis for some yield contributing traits. Besides, exhibiting exploitable level of hybrid vigour for yield, most of
these hybrids except few also showed heterosis for earliness closer to the standard variety. Therefore, these hybrids are
useful as they produced more yield day-1 in comparison to standard variety and may fit well in multiple cropping systems.
Most of the hybrids possessed higher number of seed set than pollen parent and standard variety but percentage was low
due to hybrid sterility as one of the parent used as CMS line. So far heterosis over standard variety was concerned, 50%
hybrids showed significant superiority for harvest index, ear bearing tillers plant-1, 1000 grain weight, biological yield
whereas only 40% hybrids were observed better for days to 50% flowering and days to maturity
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