IDENTIFICATION AND EVALUATION OF NATIVE RICE GENOTYPES FOR THE HYBRID RICE PRODUCTION
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Date
1999-08-30
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
An investigation was carried out at ARS, Mugad involving 25 native
"and improved genotypes of rice to estimate the extent of fertility restoration
'by different genotypes and to identify maintainers and restorers for the two
CMS lines, wz., IR58025A and IR62829A. An assessment of heterosis for
yield and yield attributing characters in the hybrid combinations involving
effective restorers as one of the male parents was done.
A wide range was observed for the extent of restoration in both the
CMS lines, assessed in terms of pollen and spikelet fertility. A highly
significant correlation was observed between pollen fertility and spikelet
fertility. The ability of fertility restoration differed in a given genotype with
the CMS lines, indicating change in the penetrance and expressivity of
fertility restoring genes according to the nuclear background of male sterile
parent. However, a restorer and three maintainers did not exhibit this type
of nuclear-cytoplasmic interaction.
Out of the 25 native and improved rice genotypes screened against
WA'®type CMS lines, for IR58025A, Antarsali and Champakali restored the
fertility effectively and in case of IR62829A, Beeraga, Champakali and
Jeerasali were the effective restorers. Three genotypes wz., Gopaldoddiga,
Huggibhatta and Ptb-7 were effective maintainers for both the CMS lines.
Most of the hybrids studied involving effective restorers as one of the
parents exhibited positive heterobeltiosis for long duration, tallness,
jiroductive tiller number and length of panicle. But in certain hybrid
ppmbinations due to different degree of spikelet sterility in the hybrids,
these characters do not reflect as increase in yield per plant.
All hybrids studied showed significantly positive standard heterosis
considering Amrut as the standard check variety. This indicates the
potentiality of the hybrids for possible commercial utilization. Among the
five hybrids studied, IR62829A/ Beeraga, 1R62829A/ Jeerasali and
1R58025A/ Antarsali were found to be promising.
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