Basic HTML Version
Heterosis Studies Performance Intra Hirsutum Hybrids (
G.hirsutum
x
G.hirsutum
) Kapas Yield Its Components
75
number of bolls per plant (33.80) followed by the
hybrid RAH128 x SC 68 (33.30), RAH 318 x RGR 24
(33.20), RCH2
Bt
(31.60) and RAH 243 x SC 7
(3140). On the other hand, the hybrid RAH 97 x SC
68 produced minimum number bolls per plant (13.10)
followed by RAH 97 x RGR 24 (13.20).
1.2.6 Mean boll weight (g)
The hybrid RAH 97 x SC 7 exhibited maximum mean
boll weight (3.76 g) followed by the hybrid RAH 97 x
RGR 32 (3.74 g), RAH 97 x SC 14 (3.58 g) and RAH
97 x SC 18 (3.52 g), while the hybrid RAHH 95 had
minimum mean boll weight (2.31g) followed by the
hybrid RAH 243 x RGR 58 (2.48 g).
1.2.7 Kapas yield per plant (g/plant)
Maximum kapas yield per plant was observed in the
hybrid RAH 97 x SC 18 (139.96 g), while the hybrid
RAH 97 x SC 68 recorded minimum kapas yield per
plant (36.93 g) followed by RAH 124 x RGR 24
(38.05 g).
1.2.8 Ginning percentage (%)
The hybrid RAH146 x RGR 32 possessed maximum
ginning out turn (42.23%) followed by the hybrid
RAH 97 x RGR 24 (41.47%), RAH146 x RGR 58
(41.37%), RAH146 x SC 68 (40.38%) and RAH 97 x
RGR 32 (39.38%), while the hybrid RAH 243 x SC
18 recorded minimum (28.74%) ginning out turn.
1.2.9 Seed index (g)
Among all the hybrids, the hybrid RAH 97 x RGR 24
recorded maximum seed index (11.50 g) followed by
the hybrids RAH 97 x SC 7, RAH 97 x RGR 58 and
RAH 97 x RGR 37 (10.75 g) , RAH 97 x SC 18
(10.50 g), RAH128 x RGR 37, RAH 97 x SC 14,
RAH 97 x RGR 32, RAH 124 x SC 18, and RAH 124
x SC 7 (10.25 g) and the hybrids RAH128 x RGR 24
and RAH146 x RGR 24 (10.00 g). On the other hand,
the hybrids RAH 318 x RGR 37 and BUNNY
Bt
recorded minimum seed index (8.00 g) followed by
RAH 243 x SC 14 and RAH128 x SC 7 (8.25 g).
1.2.10 Lint index (g)
The hybrid RAH 97 x RGR 24 had maximum lint
index (8.15 g) followed by the hybrid RAH146 x
RGR 32 (6.76 g), RAH146 x RGR 58 (6.70 g) which
are on par with one another, while the hybrid RAH
243 x SC 18 recorded minimum lint index (3.53 g)
followed by RAH 243 x SC 14 (3.90 g).
1.3 Heterosis studies
Kapas yield is the most important character
determining the worth of hybrid from the point of
view of recommendation for general cultivation.
Heterosis is the superiority of the F
1
over the mid
parental value or over the better parent or over the
standard check (Hayes et al., 1955). The magnitude of
standard heterosis for seed cotton yield had been
studied widely by Kalsy and Garg, 1995. Heterosis for
yield is expressed in the form of increased yield which
in turn is dependent on the contribution of many
component characters. All the component characters
of yield were studied for heterosis manifestation in
order to assess the worth of cross for a character.
In the present study, 48 hybrids were evaluated for
standard heterosis over commercial check hybrids viz.,
BUNNY
Bt
, RCH2
Bt
and RAHH 95. The results are
presented in Table 3~12.
1.3.1 Days to 50 per cent flowering
Among 48 hybrids, none of the hybrids showed
significant heterosis over the check RCH2
Bt
, but the
hybrid RAH 97 x SC 68 (-4.32%) followed by
RAH128 x RGR 24, RAH 243 x RGR 32 and RAH
318 x RGR 58 (-3.60%), RAH 243 x SC 7 and RAH
318 x SC 68 (-2.88%), RAH128 x RGR 32 (-2.16%),
RAH 318 x SC 7 and RAH 97 x RGR 58 (-1.44%)
exhibited heterosis in desirable direction over RCH2
Bt
(Table 3). However, the hybrid RAH 97 x SC 68
(-6.99%) followed by RAH128 x RGR 24, RAH 243 x
RGR 32 and RAH 318 x RGR 58 (-6.29%) exhibited
low heterosis in desirable direction over RAHH 95
check. This is in confirmity with the results of Marani
(1964), Police Patil (1975), Vijendradas (1982) and
Taware et al. (1987).
1.3.2 Plant height (cm)
Three out of 48 hybrids showed significant heterosis
over the check RAHH 95. Of these, the hybrid RAH
318 x RGR 37 (-24.93%) and the hybrid RAH128 x
RGR 37 (-23.33%) (Table 4) exhibited negative
significant heterosis, but the hybrid RAH146 x RGR
24 (23.51%) showed positive significant heterosis.
Although 3 hybrids expressed significant heterosis
over RCH2
Bt
, only one hybrid RAH146 x RGR 24
(24.06%) expressed significant positive heterosis and
two hybrids viz, RAH 318 x RGR 37 (-24.60%) and
RAH128 x RGR 37 (-22.99%) exhibited significant
Cotton Genomics and Genetics