Photoperiod-controlling Guttation and Growth of Rice Seedlings Under Microgravity on Board Chinese Spacelab TG-2
Guttation has been shown to play a crucial role in controlling plant growth and development by involvement of the transport of water, but how does this water transport in plant from roots to leaves work against pull of gravity is still unknown. The aim of the present study was to evaluate the influence of microgravity on photoperiod-controlling guttation and growth of rice (Oryza sativa L.) seedlings on board the Chinese Spacelab TongGong-2(TG-2). The growth rate of rice seedlings was closely correlated with guttation under both the microgravity and the ground conditions, which was increased by microgravity under both a 16-h long-day (LD) and an 8-h short-day (SD) photoperiod conditions. In addition, guttation of the TG-2 grown rice under the LD condition was more significant in comparison with that under the SD condition. These results indicated that microgravity affected the photoperiod-controlling growth of rice seedlings could be related to the enhanced guttation in space.
KeywordsRice Microgravity Photoperiod Guttation Chinese space lab
The authors are indebted to Prof. Tao Zhang’s group in Shanghai Institute of Technique Physics for PCB construction and Prof. Weining Sun for helping in the space experiment. This work was supported by the China Manned Space Flight Technology project TG-2 and the National Natural Science Foundation of China (31670864), the National natural fund joint fund project(U1738106), the Strategic Pioneer Projects of CAS (XDA15013900) and the National Science Foundation for Young Scientists of China (31500687).
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