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Subject: Crop Physiology × Author: Renuka S. Herakal × End date: 2012 × Start date: 2012 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Effect of Heat Stress on Growth, Physiology and Productivity in Different Wheat Species
    (UAS, Dharwad, 2012) Renuka S. Herakal; D.I. Jirali
    A field experiment was conducted during rabi season of 2011-12 at Main Agricultural Research Station, University of Agricultural Sciences, Dharwad to evaluate the effect of heat stress on growth, physiology and productivity in different wheat species under normal irrigated conditions. The experiment consisted of 12 genotypes (UAS-320, NIAW-1415, NIAW-34, HI-1571, DWR-1006, UAS-415, UAS-428, UAS-439, DDK-1025, DDK-1029, MACS-2971 and HW-1098) belonging to cultivated species viz., Triticum aestivum, Triticum durum and Triticum dicoccum and were laid out in a factorial randomized block design (FRBD) with three replications. The different temperature regimes were maintained by manipulating the date of sowing. Significant differences were observed in morphological, growth, physiological, biochemical, yield and yield parameters with different temperature regimes. Among the treatments, low temperature regime exhibited superiority over high temperature regime, while giving a better response to most of the yield contributing characters such as more number of branches, more number of nodes, more leaf area, more TDM, higher percentage of dry matter partitioning into economically useful parts, higher AGR, CGR, SLW, LAI, LAD, BMD, higher photosynthetic rate, higher chlorophyll content, higher chlorophyll stability index, maximum membrane thermostability, higher canopy temperature, higher heat stress index, higher protein content and higher b-carotene content ultimately resulting into more number of spikes, more spike length and weight and 1000- grain weight, thus resulting in higher grain yield. The grain yield was found positively and significantly correlated with chlorophyll stability index, canopy temperature, membrane thermo stability index, wax deposition, relative water content, and 1000- grain weight. The genotypes UAS- 439, UAS-415 and UAS-428 performed better both in low and high temperature regimes, thus indicating their use in breeding the wheat genotypes for tolerance to heat stress.