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title: Effect of diurnal irradiance on night-chilling tolerance of six rubber cultivars
author: Tian, Y. -H.;  Yuan, H. -F.;  Xie, J.;  Deng, J. -W.;  DDao, X. -S.;  Zheng, Y. -L.
Issued Date: 2016
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 chilling-tolerant cultivars in order to understand better the role of fog in protecting rubber tree from chilling-induced photodamage. In this study, we examined the photosynthetic responses of six rubber tree cultivars (Lan 873, Yunyan 77-2, Yunyan 77-4, GT1, Reken 523, and Reyan 733-97) to night-chilling stress (0, 5, and 10A degrees C) and two different irradiances (100 and 50% of full sunlight). Our results showed that all six cultivars could withstand nights at 10A degrees C for three days, while night chilling at 0 and 5A degrees C impaired photosynthesis, which was indicated by photoinhibition, decrease of soluble protein content, and accumulation of malondialdehyde. Reken 523 and Reyan 733-97 were more sensitive to night chilling than other cultivars. Low irradiance (50% of full sunlight) after the chilling treatment apparently mitigated the effect of night-chilling 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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Recommended Citation:
Tian, Y. -H.,Yuan, H. -F.,Xie, J.,et al. Effect Of Diurnal Irradiance On Night-chilling Tolerance Of Six Rubber Cultivars[J]. Photosynthetica,2016,54(3):374-380.

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