Study on the mechanism of high temperature and humidity resistance of Portulaca oleracea

Portulaca oleracea is an annual fleshy herbaceous plant of Portulacaceae Because of its strong vitality, it has a strong ability of drought resistance, high temperature, poor nutrition, etc., and is also known as "longevity vegetable" The internal mechanism of stress resistance of Portulaca oleracea was studied, and the way of regulation and control of response to stress was explored Plant proteomics provides a quick and effective way for the study of plant stress physiology, and provides a possibility for the comprehensive analysis of the molecular mechanism of plant response to stress High temperature and high humidity, as two very common adversity factors, limit the growth and development of many plants and crop yield In the tropics, high temperature is usually accompanied by the combined action of high humidity environment, but the internal mechanism of plant response to high temperature and high humidity environment stress is not very clear Hu Xiangyang group and Yang Yongping group of Kunming Institute of Botany, Chinese Academy of Sciences analyzed the response mechanism of Portulaca oleracea to high temperature and high humidity environment stress by means of proteomics and physiology The results showed that compared with other plants such as Arabidopsis, Portulaca oleracea was obviously tolerant to high temperature and humidity In this process, abscisic acid (ABA) degradation pathway was obviously activated and inhibited the over accumulation of ABA, so as to keep the stomata in the open state, promote the transpiration of leaves and effectively reduce the temperature of leaves; at the same time, heat shock protein accumulation was induced and antioxidant enzyme activity was increased to avoid cell peroxidation damage caused by high humidity and high humidity; proline metabolism pathway was also significantly stimulated Proline is produced to protect cell function The above results showed that under the stress of high temperature and high humidity, Portulaca promoted various strategies to enhance the adaptability to the stress These results have been published online by Journal of proteomics The research was supported by the "Hundred Talents Program" of the Chinese Academy of Sciences and the National Natural Science Foundation of China.