摘要
以四叶一心期的西瓜幼苗为材料,研究了10℃和15℃低温处理下西瓜幼苗的叶绿素荧光强度、脯氨酸、可溶性糖、POD和APX的变化规律。结果表明,4、6号品种的相对光化学反应活性值低于同时期的2、5号品种,前者在15℃低温处理的初期就积累了大量的可溶性糖和脯氨酸,而后者在10℃低温处理较长时间后体内才积累大量可溶性糖和脯氨酸,并且它们的增加幅度小于前者。POD和APX呈现15℃比25℃(对照)增加,10℃又下降的一般趋势,后者的变化幅度小于前者。综合实验中各项指标可以认为,2、5号品种是耐冷性品种,4、6号品种是相对敏感品种,同时叶绿素荧光强度、可溶性糖、脯氨酸可作为评价品种耐冷性的主要指标。
In order to analyze the effects of 10℃ and 15℃ low temperature treatment on watermelon seedlings, some physiological characters such as the light reaction activity, soluble sugars, proline content and the activities of POD (peroxidase) and APX (ascorbate peroxidase ) were investigated in watermelon seedlings at the age of four leaves after low temperature stress. The results indicated that, the relative light reaction activities of varieties No. 4 and No. 6 are lower that of varieties No. 2 and No. 5, the content of soluble sugar and proline in the former two varieties increased rapidly at early time point of 15℃ stress, but that of the later two varieties increased steadily long after treated under 10℃ low temperature. Compared with the respective control, the activities of POD and APX displayed a trend to increasing at 15℃ stress declining at 10℃ stress, and APX changed less than POD to some degree centigrade. Considering all the comprehensive physiological indices in this experiment, varieties No. 2 and No. 5 are relatively chilling-tolerant and varieties No. 4 and No. 6 are chilling-sensitive ones. Meanwhile, the light reaction activity, the contents of soluble sugar and proline could be applied to evaluated watermelon chilling tolerance as the main physiological performance.
出处
《武汉植物学研究》
CSCD
北大核心
2006年第5期441-445,共5页
Journal of Wuhan Botanical Research
基金
武汉市晨光计划资助项目(20045006071-36)
关键词
西瓜幼苗
综合生理指标
低温胁迫
Watermelon seedlings
Comprehensive physiological indexes
Low temperature stress