Abstract
A research work was performed under sub-tropical condition (24°8'N, 90°0'E) at Bangabandhu Sheikh Mujibur Rahman Agricultural University with three wheat genotypes (BARI Gom 25, BARI Gom 26 and Pavon 76) to observe the mobilization of seed reserve and seedling growth under normal (15°C/25°C) and elevated (25°C/35°C) temperature in growth chamber. The effect of high temperature on wheat seedling was observed in terms of mobilized seed reserve, respiration and transpiration efficiency and seedling growth. At 35°C temperature, maximum mobilization of seed reserve was observed in BARI Gom varieties (BARI Gom 25 and 26) but the respiration efficiency was higher in Pavon 76 in comparison to other genotypes. Maximum loss of respiration and transpiration at 35°C temperature was found to produce low seedling growth in Pavon 76. It appeared from the result that at high temperature the maximum mobilized seed reserve and subsequently minimum loss of respiration and transpiration collectively contributed a positive role for better seedling growth in BARI Gom 25 and BARI Gom 26. Therefore the better mobilized seed reserve and subsequently minimum loss of respiration and transpiration during seedling development are indicators of the thermo tolerance in growing wheat seedling.
Highlights
IntroductionHeat stress adversely affects seed germination, seedling development and limits wheat productivity in many regions of the world
Seed germination is a factor which contributes grain yield
The ratio of mobilized seed reserve to initial seed dry weight was considered as seed reserve depletion percentage (SRDP) [19]
Summary
Heat stress adversely affects seed germination, seedling development and limits wheat productivity in many regions of the world. Temperature is a modifying factor in germination since it can influence the rate of water absorption and other substrates supplies are necessary for growth and development [5]. Heat stress affected the mobilized seed reserve utilization efficiency during germination [17] and the magnitude of variation was different in different genotypes [18]. Respiration and transpiration efficiency played an important role to search physiological basis of sustaining seedling growth which contributed to grain yield of wheat. This research work was set to determine thermo tolerance of wheat seedling through seed germinating physiological traits
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