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Cotton Genomics and Genetics
76
negative heterosis. Similar results were reported by
Marani (1963), Young and Murray (1966),
Quisenberry (1977), Vijendradas (1982) and Singh
and Bhat (1984).
1.3.3 Number of monopodia per plant
Positive heterosis over RCH2
Bt
with respect to this
trait was observed in the hybrid RAH146 x RGR 37
(19.05%) followed by RAH 318 x RGR 58 and RAH
97 x RGR 32 (14.29%), RAH 243 x SC 68 and RAH
243 x RGR 24 (9.52%), RAH 124 x RGR 32 (7.14%)
and RAH 318 x SC 14 and RAH146 x RGR 58
(4.76%). Whereas, nine hybrids RAH 318 x SC 14
and RAH146 x RGR 58 (57.14 %), RAH 318 x RGR
58 and RAH 97 x RGR 32 (71.43%), RAH 243 x SC
14 and RAH 124 x RGR 32 (60.71%), RAH 243 x SC
68 and RAH 243 x RGR 24 (64.29%) and RAH146 x
RGR 37 (78.57%) exhibited highest significant
positive heterosis over RAHH 95 (Table 5). Heterosis
for number of monopodia per plant was earlier
reported by Gill and Singh (1982), Duhoon et al.
(1983), Kaushik et al. (1984) and Kolte and Thombre
(1984).
1.3.4 Number of sympodia per plant
Thirty four out of 48 hybrids exhibited non significant
positive heterosis over RAHH 95 check, of which the
hybrid RAH 124 x SC 18 (20.71%) recorded highest
heterosis followed by the hybrid RAH128 x SC 14
(18.83%), RAH 243 x SC 68 (18.41%), RAH146 x
RGR 58 (17.15%), RAH146 x SC 18 (16.74%) and
RAH128 x SC 68 (15.48%). On the other hand, 20
hybrids exhibited non significant positive heterosis
over BUNNY
Bt
(Table 6), of which the hybrid RAH
124 x SC 18 recorded higher heterosis (12.26%)
followed by RAH128 x SC 14 (10.51%), RAH 243 x
SC 68 (10.12%), RAH146 x RGR 58 (8.95%) and
RAH146 x SC 18 (8.56%). Heterosis for number of
sympodia per plant was earlier reported by Gill and
Singh (1982), Duhoon et al. (1983), Kaushik et al.
(1984) and Kolte and Thombre (1984).
1.3.5 Number of bolls per plant
Only three of 48 hybrids exhibited non significant
positive heterosis over RCH2
Bt
check, of which
RAH146 x RGR 58 (6.96%) recorded highest
heterosis (Table 7) followed by the hybrid RAH128 x
SC 68 (5.38%) and RAH 318 x RGR 24 (5.06%). On
the other hand, 8 hybrids expressed positive heterosis
over RAHH 95 check, of which the hybrid RAH146 x
RGR 58 (10.46%) followed by the hybrid RAH128 x
SC 68 (8.82%) and the hybrid RAH 318 x RGR 24
(8.50%). This is in accordance with the report of
Marani (1963).
1.3.6 Mean boll weight (g)
Among 48 hybrids, only nine hybrids recorded
positive heterosis over RCH2 Bt check, of which the
hybrid RAH 97 x SC 7 recorded highest heterosis of
13.10% (Table 8) followed by RAH 97 x RGR 32
(12.65%). On the other hand all the hybrids exhibited
positive heterosis over RAHH95. This is in
accordance with the report of Marani (1963).
1.3.7 Kapas yield per plant (g /plant)
Out of 48 hybrids, only one hybrid viz. the hybrid
RAH 97 x SC 18 exhibited highly significant positive
heterosis (30.09%) over RCH2
Bt
check hybrid.
Twenty four hybrids exhibited positive heterosis over
RAHH 95 check, of which the hybrid RAH 97 x SC18
exhibited highly significant positive heterosis (105.36
%) (Table 9) followed by the hybrid RAH146 x RGR
37 (55.80%), RAH146 x RGR 58 (53.93%) and RAH
318 x RGR 24 (52.02%). The other six hybrids
exhibited positive and significant heterosis on par with
RAHH 95 check. Similar reports were made by
Marani (1963), Kataraki et al. (1970), Meredith
(1979), Jagtap (1986), Katageri and Kadapa (1989).
1.3.8 Ginning outturn (%)
Among 48 hybrids, eleven hybrids exhibited positive
heterosis over RAHH 95 check. Of which the hybrid
RAH146 x RGR 32 recorded highest heterosis
(12.49%) followed by the hybrid RAH 97 x RGR 24
(10.47%) and RAH146 x RGR 58 (10.19%). On the
other hand, 29 hybrids exhibited positive heterosis
over BUNNY
Bt
check (Table 10), of which the
hybrid RAH146 x RGR 32 recorded significant
positive heterosis of 21.07% followed by RAH 97 x
RGR 24 (18.90%) and RAH146 x RGR 58 (18.60%).
For this trait, the hybrid RAH146 x RGR 32 recorded
highest positive heterosis over RAHH 95 check and
positive significant heterosis over BUNNY
Bt
was
also reported by Tiwari et al. (1987), Taware and Patil
(1993).
1.3.9 Seed index (g)
Of 48 hybrids, only one viz, RAH 97 x RGR 24
(24.32%) showed highest significant positive heterosis
Cotton Genomics and Genetics