Screening on Chilling Tolerance Appraisal Index of Watermelon

doi:10.7668/hbnxb.2014.06.028

Abstract

Abstract: 12 different genotypes of watermelon seedings were studied in low temperature stress treatment,and selected three different cold tolerant watermelon materials.The cold tolerance of 3 watermelon materials seeds during the germination were analyzed with five different temperature, study of low temperature,weak light resistance in watermelon seedings and the change of growth characteristic,photosynthesis and physiological and biochemical characteristics under low temperature,to develop an efficient,comprehensive appraisal index and evaluation method for cold-resistance watermelon,the purpose of this study was to provide theoretical basis for the actual production breeding for low temperature,weak light watermelon germplasm resources.The results showed that the chilling injury index of each genotype was different under different processing time.It is concluded that each type of cold resistance strength through the determination of chilling injury index in 6 and 8 days treatment,and choose Hongyeyihao as cold tolerant germplasm,moderately cold resistance varieties gerplasm Kangbingsumi and cold sensitive germplasm Chenglan.Under 15 ℃,Hongyeyihao germination rate,relative germination rate,length of radicle and relative radicle were the highest,15 ℃ can be used as a watermelon seed germination period of low temperature resistance identification of appropriate temperature; Date of the beginning of seed germination and relative germination rate,relative radicle length can be used as a watermelon bud good low temperature resistance appraisal indicators.After low temperature treatment,plant growth,photosynthetic rate decreased,the enzyme activity of leaves increased,MDA content increased,the change range of each index associated with varieties of low temperature treatment intensity and its cold resistance.Plant height,leaf area,plant fresh weight,root dry weight,the leaf net photosynthetic rate(Pn),Chl a/b ratio,MDA content as watermelon varieties of resistance to low temperature screening appraisal indicators.

Key words: Watermelon, Low temperature, Growth index, Photosynthetic parameter, Physiological and biochemical indicators

CLC Number:

S651.01

WANG Wei-wei, YANG Xing-ping, FAN Shu-ying, LIU Guang, ZHANG Man, XU Jin-hua. Screening on Chilling Tolerance Appraisal Index of Watermelon[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 163-171. doi: 10.7668/hbnxb.2014.06.028.

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