| Title | Effect of diurnal irradiance on night-chilling tolerance of six rubber cultivars |
| Author | Tian, Y. -H. |
| Publication | PHOTOSYNTHETICA |
| Year | 2016 |
| Volume | 54 |
| Issue | 3 |
| Corresponding Author | Zheng, YL |
| 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. |
