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Turnover of Glycerolipid Metabolite Pool and Seed Viability.

ABSTRACT: Hydration?dehydration cycles can frequently cause stress to seeds, but can also be used to improve germination. However, the molecular basis of the stress caused is poorly understood. Herein, we examine the effects of hydration?dehydration cycles on seed viability and profile the membrane glycerolipid molecular species. We find that seed viability was not affected during the first two cycles, but significantly decreased as further cycles were applied, until all viability was lost. The abundances of seven glycerolipid classes increased and decreased through hydration and dehydration, respectively, but the phosphatidic acid and diacylglycerol abundances changed in the opposite sense, while total glycerolipid contents remained constant. This suggests that during hydration?dehydration cycles, turnover of glycerolipid metabolite pools take place, while no significant lipid synthesis or degradation is involved. As further hydration?dehydration cycles occurred, lipid unsaturation increased, plastidic lipids decreased, and phosphatidylserine acyl chains lengthened. The latter two could be lethal for seeds. Our findings reveal a novel model of membrane lipid changes, and provide new insights into the responses of seeds to hydration?dehydration cycles.

SUBMITTER: Hu XL

PROVIDER: S-EPMC5983817 | biostudies-other | 2018 May

REPOSITORIES: biostudies-other

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Turnover of Glycerolipid Metabolite Pool and Seed Viability.

Hu Xiao-Long XL Yu Xiao-Mei XM Chen Hong-Ying HY Li Wei-Qi WQ

International journal of molecular sciences 20180509 5

Hydration⁻dehydration cycles can frequently cause stress to seeds, but can also be used to improve germination. However, the molecular basis of the stress caused is poorly understood. Herein, we examine the effects of hydration⁻dehydration cycles on seed viability and profile the membrane glycerolipid molecular species. We find that seed viability was not affected during the first two cycles, but significantly decreased as further cycles were applied, until all viability was lost. The abundances ...[more]

PMID: 29747431

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Project description:Background:Soybean oil constitutes an important source of vegetable oil and biofuel. However, high temperature and humidity adversely impacts soybean seed development, yield, and quality during plant development and after harvest. Genetic improvement of soybean tolerance to stress environments is highly desirable. Results:Transgenic soybean lines with knockdown of phospholipase D?1 (PLD?1KD) were generated to study PLD?1's effects on lipid metabolism and seed vigor under high temperature and humidity conditions. Under such stress, as compared with normal growth conditions, PLD?1KD lines showed an attenuated stress-induced deterioration during soybean seed development, which was associated with elevated expression of reactive oxygen species-scavenging genes when compared with wild-type control. The developing seeds of PLD?1KD had higher levels of unsaturation in triacylglycerol (TAG) and major membrane phospholipids, but lower levels of phosphatidic acid and lysophospholipids compared with control cultivar. Lipid metabolite and gene expression profiling indicates that the increased unsaturation on phosphatidylcholine (PC) and enhanced conversion between PC and diacylglycerol (DAG) by PC:DAG acyltransferase underlie a basis for increased TAG unsaturation in PLD?1KD seeds. Meanwhile, the turnover of PC and phosphatidylethanolamine (PE) into lysoPC and lysoPE was suppressed in PLD?1KD seeds under high temperature and humidity conditions. PLD?1KD developing seeds suffered lighter oxidative stresses than did wild-type developing seeds in the stressful environments. PLD?1KD seeds contain higher oil contents and maintained higher germination rates than the wild-type seeds. Conclusions:The study provides insights into the roles of PLD?1 in developing soybean seeds under high temperature and humidity stress. PLD?1KD decreases pre-harvest deterioration and enhances acyl editing in phospholipids and TAGs. The results indicate a way towards improving production of quality soybean seeds as foods and biofuels under increasing environmental stress.

Dataset Information

Turnover of Glycerolipid Metabolite Pool and Seed Viability.

Publications

Turnover of Glycerolipid Metabolite Pool and Seed Viability.

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