Variability analysis of allogamous traits in rice
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Date
2000
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Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara
Abstract
The research project entitled "Variability analysis of allogamous traits
In rice (Oryza saliva L.)" was carried out in the College of Horticulture,
Vellanikkara, Thrissur and the Agricultural Research Station, Mannuthy, Thrissur
during the period 1998-99. The major objective of the study was to estimate the
amount of variability for floral traits influencing out-crossing in high yielding,
local and wild genotypes and CMS lines. It also evaluated the association of these
floral traits to out-crossing and identified the genotypes with good morphological
traits favouring out-crossing, which can be utilized for restructuring rice flower to
suit hybrid seed production.
Statistical analysis revealed significant variation in all the 18 characters
studied viz, plant height, flag leaf angle, panicle exsertion at flowering and
maturity, per cent out-crossing, anther length, filament length, pollen fertility,
pollen viability, residual pollen, stigma length, stigma diameter, stigma hair length,
angle between stigmatic lobes, stigma exsertion per cent, glume angle, duration of
spikelet opening and flowering period in thirty three genotypes of rice.
Highest genotypic coefficient and phcnotypic coefficients of variations
were observed for STigma exsertion followed by per cent out-crossing and residual
pollen. Correlation studies revealed significant positive correlation between out-
crossing and the floral traits flag leaf angle and spikelet opening-closing duration.
All the traits except residual pollen showed high heritability coupled with genetic
gain.
Statistical studies showed V20A and V20B, Jaya, Kanchana, Bharathi,
Neeraja, Kairali, Nandyar, Chennellu, Oryza longistamina, Oryza oJjicinalis and
Oryza spontanea with good floral traits favouring out-crossing.
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PG
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Citation
171636