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Cotton Genomics and Genetics
40
was planned to assess the relative potential of the
barbadense and hirsutum in developing interspecific
hybrid combinations. The objective of this part of the
study was to determine the relative of 4 barbadense
and 23 hirsutum lines. Barbadense were used as lines
and hirsutum were used as testers.
Among four barbadense lines positive
gca
effects for
seed cotton yield was recorded by DB 533 and DB
534 confiriming the potential of these barbadense
lines in developing productive interspecific hybrids.
Among 23 hirsutum testers, four testers DH 98-27,
ZCH 8, 178-24 and DH 18-31exhibited good positive
values of
gca
effects for seed cotton yield and were
located among top ten testers ranks 2, 8, 1 and 7
respectively when compared to other hirsutum testers.
2.2 Comparison of hybrids based on heterotic box
with checks and other crosses
The efforts on creating recombinational variability
have begun with two barbadense and four hirsutum
lines. However, to compare the potentiality of these
hybrids with other potential hybrids developed over
years at Dharwad centre and best commercial hybrids
(
Bt
and non
Bt
). A separate evaluation of these hybrids
was taken up.
Study on this set of crosses was denoted as best HB
trial. The data generated on 49 best HB crosses of this
study is utilized to confirm the performance of eight
crosses of the heterotic box. The potential of 8 bench
mark crosses of heterotic box [ZCH 8 x DB 533, DH
98-27 x DB 534, DH 18-31 x DB 533, ZCH 8 x DB
534, 178-24 x DB 533, DH 98-27 x DB 533, DH
18-31 x DB 534 and 178-24 x DB 534] recorded
higher
per se
performance for seed cotton yield
ranking 1, 2, 4, 6, 8, 10, 11 and 14 out of 49 crosses.
These crosses also recorded superior value for yield
attributing characters like number of bolls and mean
boll weight. The mean performance of these crosses
associated with this heterotic box was found to be
2174 kg/ha as compared to the overall mean of best
HB interspecific hybrids which was 1921kg/ha.
The crosses namely ZCH 8 x DB 533, DH 98-27 x
DB 534, DH 18-31 x DB 533, ZCH 8 x DB 534 and
178-24 x DB 533 recorded highest yield combining
good fibre micronaire and fibre length. These crosses
are examples for blending of both quality and yield.
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