Analysis of Changes in the Glycerolipidome in Response to Long-term Chilling and Heat

Overview

Journal Plant Divers

Specialty Biology

Date 2020 May 7

PMID 32373768

Authors

Tao Liu

Jia Chen

Furong Xu

Xiahong He

Shengchao Yang

Youyong Zhu

Weiqi Li

Guowei Zheng

Affiliations

Soon will be listed here.

Abstract

Long-term moderately high or low temperatures can damage economically important plants. In the present study, we treated , an important traditional Chinese medicine, with temperatures of 10, 20, and 30 °C for 30 days. We then investigated glycerolipidome responses to these moderate temperature stresses using an ESI/MS-MS-based lipidomic approach. Both long-term chilling (LTC, 10 °C) and long-term heat (LTH, 30 °C) decreased photo pigment levels and photosynthetic rate. LTH-induced degradation of photo pigments and glycerolipids may further cause the decline of photosynthesis and thereafter the senescence of leaves. LTC-induced photosynthesis decline is attributed to the degradation of photosynthetic pigments rather than the degradation of chloroplastidic lipids. has an especially high level of lysophosphatidylglycerol, which may indicate that either phospholipase A acts in a special manner on phosphatidylglycerol (PG), or that phospholipase B acts. The ratio of sulfoquinovosyldiacylglycerol (SQDG) to PG increased significantly after LTC treatment, which may indicate that SQDG partially substitutes for PG. After LTC treatment, the increase in the degree of unsaturation of plastidic lipids was less than that of extraplastidic lipids, and the increase in the unsaturation of PG was the largest among the ten lipid classes tested. These results indicate that increasing the level of unsaturated PG may play a special role in maintaining the function and stability of photosystems after LTC treatment.

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