Genetic divergence for cross prediction in potato |
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| Authors: | J Gopal JL Minocha |
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| Institution: | (1) Biotechnology Centre, Punjab Agricultural University, Ludhiana-141 001, Punjab, India;(2) Present address: Division of Genetics, Central Potato Research Institute, Shimla, 171 001, HP, India |
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| Abstract: | To study the effectiveness of genetic divergence for cross prediction in potato, progeny means, heterosis and specific combining
ability effects were correlated with parents’ genetic distances (D values) estimated under six in vitro and four in vivo conditions,
for tuber yield in 72 crosses (18 × 4) of 22 parents under autumn crop conditions for three successive generations. Genetic
distances under in vitro conditions had no relationship with the progeny means for tuber yield. Whereas, those under in vivo
conditions in the autumn seasons were positively associated with the progeny means. Similarly, heterosis for tuber yield had
a stronger relationship with genetic distances based on an in vivo crop than those based on an in vitro crop. All correlation
coefficients between genetic distances and specific combining ability effects were non-significant. The magnitudes of the
significant correlation coefficients showed that genetic divergence can be used as an indirect parameter of moderate effectiveness
in selecting parents to produce heterotic high yielding progenies. Such cross predictions, however, would be effective only
if parents are evaluated under the conditions similar to those under which crosses are likely to be evaluated.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | cross prediction genetic divergence in vitro genetic divergence potato Solanum tuberosum |
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