GENETIC STUDIES ON FERTILITY RESTORATION IN RABI SORGHUM (Sorghum bicolor (L.) Moench)
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Date
2001
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University of Agricultural Science, Dharwad
Abstract
"Two male sterile lines representing miio {104A) and maldandi (M31-2A) were
crossed with 20 diverse genotypes to study the restoration pattern and also to identify
the stable restorers across two dates of sowing. The study revealed that, proportion
of restorers on milo (75%) was more than that on maldandi (15%) cytoplasm. Of the
20 genotypes, only two were found to be strong and stable on milo cytoplasm while
none on maldandi cytoplasm. The seed set % in hybrids sown during 2""^^ date of
sowing was less as the flowering period of those hybrids coincided with low
temperature stress.
To know tho offoct of low temperature on seed sot % , two hybrids each on
milo and maldandi were sown at an interval of 15 days from 1^' September to 1^'
December, 2000. It was evident that lowest seed set % in hybrids coincided with
lowest weekly mean minimum temperature prevailed during flowering of the
respective hybrids.
Inheritance studies revealed that , fertility restoration on milo is under the
control of single dominant geno and that of maldandi is under tho control of duplicate
epitasis gene action.
In the variability studies, the traits viz., grain yield per plant, plant height, ear
head length and number of leaves exhibited high GCV, PCV and high heritability
coupled with high genetic advance. Correlation studies indicated that grain yield per
plant had strong and positive association with plant height, number of leaves , ear
head diameter, number of primaries and tost weight.
In the genetic diversity studies, the 138 genotypes were grouped into 13
divergent clusters (four composite and nine solitary). The trait, plant height
contributed maximum (69.96%) towards the genetic diversity. In the present study, no
definite relationship was seen between googtaphlcal distribution of the genotypes
and the genetic diversity."
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No. of references 112