Studies on Physiological and Biochemical Characteristics and Inheritance of Chilling Tolerance of Seedlings on Watermelon Wild Germplasm

doi:10.3321/j.issn:1000-7091.2000.02.015

Abstract

Abstract: Watermelon wild germplasm (Citrullus lanatus var citroides) PI482322hadhigh chilling tolerance under the condition of (12±1)℃ temperature and 140μE·m^-2·s^-1 PFD (photon flux density). As the time of low temperature treatment increased, the activities of SOD and CAT in watermelon seedling leaves decreased. Comparing with these of chilling sensitive cultivar 97103, the decrement of activities of SOD and CAT of wild chilling resistance germplasm PI482322 was smaller, and the accumulation content of active oxygen in the seedling was less. These were main physiological causes of cold resistance. The chilling tolerance of PI482322 was controlled by one dominant gene.

Key words: Watermelon (Citrullus lanatus), Chilling tolerance, Physiological and biochemical characteristic, Inheritance

CLC Number:

S651.01

XU Yong, ZHANG Haiying, KANG Guobin, WANG Yongjian. Studies on Physiological and Biochemical Characteristics and Inheritance of Chilling Tolerance of Seedlings on Watermelon Wild Germplasm[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2000, 15(2): 67-71. doi: 10.3321/j.issn:1000-7091.2000.02.015.

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