棉 花 学 报    Cotton Science   2010，22（2）：132-137

Cold Tolerance Evaluation of Cotton Seedling Using Some Parameters of Chlorophyll a Fluorescence Kenitics O-J-I-P
LI Zhi-bo¹, HUA Xian-wei², WEI Yi-nong¹, CAO Lian-pu^1*
（1.The Agronomy Department of Shihezi University/Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China; 2.The Forth Proving-ground of Shihezi Center Ground, Shihezi, Xinjiang 832004，China）

Abstract: Low temperature and chilling affect cotton developing, to set up a simple and efficient identification and select critiria for cold-tolerance variety is the main breeding aim of cotton. In this paper, the evaluation of the cold-tolerance of cotton seedling by the parameters of chlorophyll a fluoroscence kinetics O-J-I-P was showed. Seedlings of 22 cottons cultivars which fit for planting in Northern Xinjiang area were chilled(4 ℃) for 4 consecutive days, their chilling index,chilling factor index 1(CFI1) based on O-J-I-P parameter Fv/Fm(the maximum efficiency of photosystem II) and chilling factor index 2(CFI2) based on PI(the performance index) were seperately analyzed. The results showed that the final indentification and evaluation of CFI1, CFI2 and chilling index were almost indentical. The seedlings of CCRI 36, Xinluzao 25 and 297-5 were cold-tolerant, but seedlings of Xinluzao 10, Xinluzao 12 and Paotai 1 were cold sensitive. O-J-I-P test provides a rapid and efficient method on screening cotton seedlings' cold-tolerance, which is helpful for cotton cold-tolerance breeding.
Key words: low temperature and chilling; cotton; chlorophyll a fluorescence; cold-tolerance;
chilling factor index             [Full Text, 382KB]