SYNCHRONIZATION STUDIES IN PARENTAL LINES OF RICE HYBRIDS
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Date
2001
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD
Abstract
"The field experiments were carried out at Main Research Station,
Dharwad and Agricultural Research Station, Siruguppa during kharif
2000-01 on synchronization of flowering in parental lines of rice hybrids.
Among the parental lines the restorer line KMR-3 required more
effective accumulated temperature and produced more number of leaves,
where as another restorer line IR9761-19-01 required less effective
accumulated temperature and produced less number of leaves till 50 per
cent flowering at both the locations. The maintainer line required less
effective accumulated temperature and produced less number of leaves
compared to their respective CMS lines. The growth duration and effective
accumulated temperature requirement of the parental lines varied with
locations, where as, the number of leaves produced by the parental lines
was relatively stable. Hence, the leaf number difference method was found
to be more reliable for adjusting the planting dates of parental lines at
both the locations.
The maintainer line (IR58025B) was early by 4.7 days in 50 per cent
flowering than the female line (1R58025A). Sowing of maintainer line, five
days later than the female line was found to achieve better
synchronization and increased the seed yield by 45.3 per cent, over
simultaneous planting (control). The foliar spray of gibberellic acid (100
ppm) or single super phosphate (1.0%) to female parent at panicle
initiation enhanced the 50 per cent flowering by 3.4 and 2.4 days and
increased the seed yield of female line by 46.1 and 29.4 per cent,
respectively over control. Foliar spray of urea (2.0%) to maintainer line or
jerking the seedling of maintainer line at panicle initiation delayed 50 per
cent flowering by 2.7 and 2.0 days and increased the seed yield by 30.8
and 27.4 per cent, respectively over control. Spraying of gibberellic acid
100 ppm and simultaneous planting recorded significantly higher
germination (93.3%), shoot length (12.6 cm), root length (12.7 cm),
seedling dry weight (134.6 mg) and vigour index (2356) compared to all
other treatments."
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No. of references 88