TITLE:
Physiological Mechanism of Thermotolerance in Wheat (Triticum aestivum Lin.) Seedlings
AUTHORS:
Soyema Khatun, Jalal Uddin Ahmed, Md. Mahi Imam Mollah, Kim Taewan
KEYWORDS:
Thermo Tolerance, Mobilized Seed Reserve, Heat Stress, Wheat
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.13,
December
25,
2018
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.