Variation of wheat cultivars in their relationship between seed reserve utilization and leaf temperature under elevated
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J. Crop Sci. Biotech. 2015 (June) 18 (2) : 97 ~ 101 DOI No. 10.1007/s12892-014-0117-y RESEARCH ARTICLE
Variation of Wheat Cultivars in Their Relationship between Seed Reserve Utilization and Leaf Temperature under Elevated Temperature Soyema Khatun1*, Jalal Uddin Ahmed2, Mohammed Mohi-Ud-Din2 Bangladesh Institute of Nuclear Agriculture, Mymensingh 2202, Dhaka Division, Bangladesh Department of Crop Botany, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur-1706, Bangladesh
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Received: November 21, 2014 / Revised: January 26, 2015 / Accepted: February 5, 2015 Ⓒ Korean Society of Crop Science and Springer 2015
Abstract An investigation on physiological changes was carried out in three wheat genotypes (BARI Gom 25, BARI Gom 26, and Pavon 76) through seed reserve utilization efficiency (SRUE) and leaf cooling under normal (15 / 25°C) and elevated (25 / 35°C) temperatures in the growth chamber. At high temperature, Pavon 76 required more days to initiate the fully autotrophic stage. After germination, seedling and remnant seed dry weight was the same at day 5 in BARI Gom 26 and day 6 in BARI Gom 25 and Pavon 76. At high temperature, maximum translocation efficiency and seed reserve utilization efficiency (SRUE) were observed in BARI Gom 26 and at a minimum value in Pavon 76. High leaf cooling was recorded in BARI Gom 26. At high temperature, due to high leaf temperature and low transpiration rate of Pavon 76, maximum reduction of seedling growth was recorded in Pavon 76 (17%) as compared to minimum in BARI Gom 26 (5%). It appeared from the result that at high temperature the better seed reserved utilization efficiency and subsequently larger leaf cooling collectively contributed a positive role for seedling development in BARI Gom 25 and BARI Gom 26. The relationship of seed reserve utilization efficiency and leaf temperature were prominent in the case of Pavon 76 (r = -0.768) compared to other genotypes. This relationship indicated that Pavon 76 was the most sensitive genotype and BARI Gom 25 and BARI Gom 26 was the tolerant genotype to heat stress in respect to seed reserve utilization efficiency during seed reserve dependent phase and leaf temperature of photosynthetic-dependent phase. Key words : Elevated temperature, Leaf temperature, SRUE, Wheat cultivars
Introduction Wheat is one of the most important thermo-sensitive crops. The optimum temperature of the crop varies at different stages of growth and development. The crop grows better in a temperature range from 15 to 18°C (Choudhury and Wardlaw 1978). The temperature from 20 to 25°C was found to be favorable for wheat seed germination, seedling emergence, and optimum plant establishment (Behl et al. 1993). Exposure to temperatures above 26°C can significantly reduce grain yield (Tewolde et al. 2006). High temperature Soyema Khatun (
) Email: [email protected] Tel: 01783102914
The Korean Society of Crop Science
reduces the grain growth duration and hence reduces the grain size (Tahir and Nakata 2005). Reduced grain size contr
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