Regulation of extracellular ATP onchlorophyll content and fluorescence characteristics of Angelica sinensis seedlings under drought and low temperature stress / 中国中药杂志

As an important signal molecule, extracellular ATP(eATP) can regulate many physiological and biochemical responses to plant stress. In this study, the regulation of extracellular ATP(eATP) on chlorophyll content and chlorophyll fluorescence parameters of Angelica sinensis seedlings were studied under drought and low temperature stress. The results showed that all the chlorophyll content, the actual photochemical efficiency [Y(Ⅱ)], the electron transfer rate(ETR), the photochemical quenching coefficient(qP and qL) of A. sinensis leaves were significantly decreased under drought and low temperature stress, respectively. At the same time, non-photochemical quenching(NPQ and qN) were also all significantly increased, respectively. The application of eATP alleviated the decrease of chlorophyll content, Y(Ⅱ), ETR, qP and qL of A. sinensis leaves under drought and low temperature stress, and eliminated the increase of qN and NPQ. The results indicated that eATP could effectively increase the open ratio of PSⅡ reaction centers, and improve the electron transfer rate and light energy conversion efficiency of PSⅡ of A. sinensis leaves under drought and low temperature stress. It is beneficial to enhance the chlorophyll synthesis and the adaptability of PSⅡ about A. sinensis seedlings to drought and low temperature stress.

Study on Physiological Mechanisms in Frozen Storage to Reduce Early Bolting of Angelica Sinensis / 世界科学技术-中医药现代化

This article was aimed to study the physiological mechanisms in frozen storage to reduce early bolting of Angelica sinensis. By analyzing the root soluble sugar, soluble protein, MDA content changes before and after -10oC processing of the Angelica sinensis seedlings of different size from different sources , the physiological mechanisms in frozen storage reducing early bolting of A . sinensis had been studied. The results indicated that the greater seedlings , the higher content of soluble sugar , lower protein content and higher MDA . There were no obvious differences on the soluble sugar , soluble protein and MDA content of the same size seedlings from different sources . After -10oC freezing , the content of soluble sugar and protein in the seedlings with the same size were decreased. Meanwhile, the content of MDA was increased. It was concluded that the content of soluble sugar, soluble protein and MDA were obviously related to the size of Angelica sinensis seedlings from the same source before and after low temperature process .