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Nihar Ranjan Chakraborty*
Paresh Chandra Kole
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Nihar Ranjan Chakraborty*
Paresh Chandra Kole
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International Journal of Plant Breeding and Crop Science

Gamma ray induced early generation polygenic variability in medium grain aromatic non-basmati rice

Gamma ray induced early generation polygenic variability in medium grain aromatic non-basmati rice

Nihar Ranjan Chakraborty and Paresh Chandra Kole

Department of Crop Improvement, Horticulture & Agril. Botany, Institute of Agriculture, Visva-Bharati, Sriniketan-731 236, West Bengal, India

Accepted 15 November, 2014

Citation: Chakraborty NR, Kole PC (2014). Gamma ray induced early generation polygenic variability in medium grain aromatic non-basmati rice. International Journal of Plant Breeding and Crop Science, 1(3): 028-035.

Copyright: © 2014. Chakraborty and Kole. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

Two advanced breeding lines of aromatic non-basmati rice, IET 14142 and IET 14143, irradiated with 250Gy, 350Gy and 450Gy of gamma ray induced wide variation for polygenic characters in M2 and M3 generations. Wide range of genotypic and phenotypic coefficients of variation (GCV and PCV) for different characters indicated differential radio-sensitivity of the characters. Increase in values of GCV and PCV in M3 over M2 generation for flag leaf length and spikelet number was due to “release of additional variability”. Heritability in M3 generation increased over M2 in IET 14142 for days to flower and flag leaf angle at all three doses, and for other characters only at certain doses. The genetic advance increased from M2 to M3 in IET 14142  for some characters due to increase in variance, while it decreased in M3 generation in IET 14143 for certain characters due to increase in mean values. The overall results indicated the scope for isolating promising segregants in micro mutational population even in early generations.

Key words: Aromatic rice, gamma irradiation, micromutation, M2 and M3 generations, selection, variability