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Advances in Agriculture
Volume 2014 (2014), Article ID 231301, 17 pages
Research Article

Screening of Pearl Millet F1 Hybrids for Heat Tolerance at Early Seedling Stage

1CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India
2Department of Genetics and Plant Breeding, CCS HAU, Hisar 125004, India

Received 30 April 2014; Revised 7 August 2014; Accepted 26 August 2014; Published 2 October 2014

Academic Editor: Clifford Gold

Copyright © 2014 Ashok Kumar Yadav et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Ten pearl millet genotypes selected on the basis of response to supra-optimal temperature tolerance were crossed in a half-diallel mating system. The 45 hybrids produced were tested along with parents for heat tolerance and related traits at seedling stage. Field screening and laboratory screening techniques were simultaneously used for the evaluation of hybrids and their parents. Heat tolerance was measured as seedling thermotolerance index (STI) and seed to seedling thermotolerance index (SSTI) under field conditions, but membrane thermostability (MTS) in the laboratory. The hybrid H77/29-2 CVJ-2-5-3-1-3 showed highest STI value followed by H77/833-2 96AC-93. The genotype H77/833-2 96AC-93 had the highest worth for SSTI. These three indices were highly correlated among themselves. STI values were invariably high, whereas SSTI has lower values, as it also covers the effect of under soil mortality (USM). It was seen that the heat tolerance indices STI and SSTI were not showing any perceptible pooled correlation with developmental traits except germination and emergence rate. Based on our results, it could be suggested that membrane thermostability (MTS) may be used for screening large number of genotypes. Field based indices STI and SSTI may be used for evaluation of hybrids and varieties before they are released.