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Per cent heterosis (over
mid-parent) ranged from -30.2 to 16.7 for NT, -13.8 to 31.2 for NG,
-5.4 to 13.2 for GW and -31.9 to 36.9 for GY in normal environment.
Likewise, in stress environment such a range was from -29.0 to 23.8
for NT, -26.8 to 22.1 for NG, -9.7 to 16.5 for GW and -35.4 to 56.4
for GY. Highest heterosis 36.9 and 56.4 per cent for GY was
expressed by hybrids WL 711 x HD 2122 and UP 262 x HD 2122 in normal
and stress environments, respectively. Out of 36 hybrids, only 3, 10,
16 and 13 in normal environment and 1, 7, 16 and 11 in stress
environment showed significant heterosis for NT, NG, GW and GY,
respectively. Majority of hybrids, exhibiting significant heterosis,
manifested negative heterosis and narrow range for NT in both the
environmets. Heterosis for GY, therefore, could be attributed mainly
to GW and/or NG. Intercluster hybrids were more frequent among
hybrids with significant heterosis though the expression of heterosis
was better in intracluster hybrids. Lack of heterosis in highly
divergent intercluster hybrids may be attributed to unfavourable gene
interactions or intercancellation of favourable gene effects, whereas
high heterosis in intra-/intercluster hybrids with medium to low
genetic divergence may be explained on the basis of complementary
gene effects.
References
Arunachalam V, Bandyopadhyay A, Nigam. SN and Gibbons RW (1984)
Heterosis in relation to genetic divergence and specific combining
ability in groundnut (Arachis hypogaea L). Euphytica
33: 33-39.
Behl RK and Singh VP (1986) Genetic divergence in some triticales
strains and their hybrids. Wheat Information Service 61 & 62:
46-50.
Behl RK, Singh VP and Paroda RS (1985) Genetic divergence in relation
to heterosis and specific combining ability in triticale. Indian J
Genet 45: 368-375.
Chaudhary BD and Singh VP (1975) Genetic divergence in some Indian
and exotic barley varieties and their hybrids. Indian J Genet 35:
409-412.
Jatasra DS and Paroda, RS (1978) Genetic divergence in wheat under
different environmental conditions. Cereal Res Communication 6:
307-317.
Rao CR (1952) Advanced Statistical Methods in Biometric Research.
John Wiley and Sons Inc., New York.
Somayajulu PLN, Joshi AB and Murty BR (1970) Genetic divergence in
wheat. Indian J Genet 30: 47-58.
Srivastava PSL and Arunachalam V (1977) Heterosis as a function of
genetic divergence in triticale. Z Pflanzenzuchtung 78: 269-275.
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