Effectiveness of in vitro selection for agronomic characters in potato |
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Authors: | J Gopal JL Minocha |
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Institution: | (1) Biotechnology Centre, Punjab Agricultural University, Ludhiana-141 004 (Pb.), India;(2) Present address: Division of Genetics, Central Potato Research Institute, Shimla-171, 001, HP, India |
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Abstract: | Effectiveness of in vitro selection for agronomic characters was studied by finding correlation coefficients between in vitro
and in vivo performance of 22 potato genotypes. Evaluation was performed under eight in vitro and two in vivo conditions.
Genotypic differences were highly significant for various characters under all in vitro and in vivo conditions. Error mean
squares were much lower in in vitro experiments than in in vivo experiments. In vitro selection was found to be highly effective
for tuber colour, stem pigment and number of eyes, and moderately effective for average tuber weight, plant vigour and foliage
senescence under specific conditions. The results also indicated the possibility of in vitro selection for heat tolerance.
For tuber yield and number of tubers, effectiveness of in vitro selection was low to very low, because differences in phenotypic
expressions of genotypes were much enlarged under in vitro conditions compared to under in vivo conditions. Correlation coefficients
for certain characters were better when in vitro conditions were closer to in vivo conditions. To improve the efficiency of
in vitro selection, there is perhaps a need to simulate and identify the in vitro conditions under which genotypic differences
are reflected in phenotypes more realistically as they are expressed under in vivo conditions.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | in vitro selection micropropagation potato breeding Solanum tuberosum |
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