Screening of Pearl Millet F₁Hybrids for Heat Tolerance at Early Seedling Stage

Abstract

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 F 1 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 F 1 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.

Can Tall Guinea‐Race Sorghum Hybrids Deliver Yield Advantage to Smallholder Farmers in West and Central Africa?

“…Furthermore, the relative yield superiorities were even larger in the lowest‐productivity conditions (Table 4), under which the majority of sorghum farmers in Mali grow sorghum (Leiser et al, 2012; Rattunde et al, 2016). Higher yield superiorities of hybrids over pure‐line check varieties under stressed environments were previously observed in sorghum (Haussmann et al, 1998) and other crops (Bidinger et al, 1994; Tollenaar and Wu, 1999; Betrán et al, 2003; Yadav et al, 2014).…”

Identification and Characterization of Contrasting Genotypes/Cultivars for Developing Heat Tolerance in Agricultural Crops: Current Status and Prospects

“…Similarly, among three rice cultivars, F60 and F733 were more heat-susceptible than F473 when grown at 40 • C, with greater electrolyte leakage (20 and 15%) (Sanchez-Reinoso et al, 2014). Likewise, Yadav et al (2014) used CMT as an effective screening parameters for selecting heat tolerant lines in Pearl millet. From the same study, the authors also identified H77/29-2 × CVJ-2-5-3-1-3 hybrid as heat tolerance based on seedling thermotolerance index.…”

Recognizing production options for pearl millet in Pakistan under changing climate scenarios

“…A better understanding of the impacts of climate on crop productivity is a basic requirement to enhance climate resilience in crop varieties through breeding or for adapting current varieties more resilient to climate induced stress through management options via various strategies to respond the contrary impacts of climate change on crop economic part (Barnabas et al 2008). Various tools can also be used in optimizing natural resources to assess the impacts of future impending climate on crop productivity (Yadav et al 2014).…”