HETEROSIS AND STABILITY STUDIES IN RABI SORGHUM [Sorghum bicolor (L.) Moench
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Date
2004
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University of Agricultural Science, Dharwad
Abstract
"The material for the present study comprised of 20 hybrids developed
by involving 13 restorers and five male sterile lines and six checks of rabi
sorghum. All these were evaluated during rabi 2002 at three different
locations viz., Main Agricultural Research Station, Dharwad (Ei), Regional
Agricultural Research Station, Bijapur (E2) and Agricultural Research
Station, Bagalkot (E3). The first two locations were rainfed environments,
E3 was protectively irrigated condition.
Analysis of variance revealed that the mean sum of squares of the
genotypes (hybrids and checks) were highly significant at all the three
locations for all the characters studied. The pooled analysis of variance
revealed that genotypic differences pooled over environments were significant
for six characters out of 10 characters studied. The crosses x environment
interaction was significant for all characters except for panicle length and
number of primaries per panicle, which indicates that the genotypic
performance of the hybrids varied with change in environment. Based on
heterosis, the hybrids M31-2A x BRJ-67, 53A x BRJ-204, 53A x SPV-570
and 116A X BRJ-204 were found to be the best combinations for grain yield
and other component characters and performed well at all the three
locations. But, among these hybrids M31-2A x Katizapur local and 117A x
BRJ-356 were late maturing as compared to hybrid and local check, whereas
104A X BRJ-356 and 104A x SPV-1503 were early maturing with higher
grain yield as compared to both checks. The hybrid 53A x SPV-570
performed well in all the locations and showed significant positive standard
heterosis over both check for grain yield in all the three locations.
The estimate of stability parameters revealed that M31-2A x BRJ-62,
53A x SPV-570 and 117A x BRJ-356 were stable for most of characters
under study. The crosses 104A x SPV-1457 was stable specific for grain yield
and M31-2A x MH Jola for fodder yield. However, 104A x BRJ-356 and
M31-2A X CR-9 showed partial adaptation to all the environments with
respect to grain yield, while 117A x BRJ-356 to infavourable environments.
For fodder yield 104A x SPV-1504 showed specific adaptation for favourable
environmental condition, while M31-2A x MH Jola for all environments."
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