Authors: YH Tian HF Yuan J Xie JW Deng XS Dao YL Zheng
Publish Date: 2015/12/11
Volume: 54, Issue: 3, Pages: 374-380
Abstract
The rubber tree Hevea brasiliensis is an important tropical crop with a high economic value that has been successfully cultivated in Xishuangbanna China Xishuangbanna has a long dry season November–February with cold nights and frequent fog events Thus it is important to select chillingtolerant cultivars in order to understand better the role of fog in protecting rubber tree from chillinginduced photodamage In this study we examined the photosynthetic responses of six rubber tree cultivars Lan 873 Yunyan 772 Yunyan 774 GT1 Reken 523 and Reyan 73397 to nightchilling stress 0 5 and 10°C and two different irradiances 100 and 50 of full sunlight Our results showed that all six cultivars could withstand nights at 10°C for three days while night chilling at 0 and 5°C impaired photosynthesis which was indicated by photoinhibition decrease of soluble protein content and accumulation of malondialdehyde Reken 523 and Reyan 73397 were more sensitive to night chilling than other cultivars Low irradiance 50 of full sunlight after the chilling treatment apparently mitigated the effect of nightchilling stress It indicates that frequent fog events after cold nights might greatly contribute to the success of rubber tree cultivation in Xishuangbanna
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