Genotype determines Arbutus unedo L. physiological and metabolomic responses to drought and recovery

编号 040037703

推送时间 20230109

研究领域 森林培育 

年份 2022 

类型 期刊 

语种 英语

标题 Genotype determines Arbutus unedo L. physiological and metabolomic responses to drought and recovery

来源期刊 Frontiers in plant science

期 第377期

发表时间 20221024

关键词 drought;  phenolic compounds;  Micropropagation;  plant hormones;  Strawberry tree; 

摘要 Strawberry tree (Arbutus unedo) is a small resilient species with a circum-Mediterranean distribution,high ecological relevance in southern European forests and with several economical applications. As most orchards are usually installed on marginal lands where plants usually face severe drought, selecting plants that can better cope with water restriction is critical, and a better understanding of the tolerance mechanisms is required. Strawberry tree plants under drought follow a typical isohydric strategy, by limiting transpiration through stomata closure. However, the contribution of genotype and its bio-geographic origin on plant performance needs clarification, as well as the involvement of a specific metabolic reactions associated with the mechanical response. To test this hypothesis, several eco-physiological and biochemical parameters were assessed on different genotypes, and the metabolic profiles studied, including important stress-related phytohormones, on plants under different water regimes (plants watered to 70% and 18% field capacity) and a recovery assay. A contrasting drought tolerance was found in plants from different genotypes, associated with physiological and metabolic responses. Metabolomics revealed more than 500 metabolic features were differentially accumulated, including abscisic and salicylic acids, for the genotype with better performance under drought (A4). This genotype also recovered faster when the imposed stress was interrupted, thus indicating the relevance of metabolic adaptation under water deficit conditions. By correlating carbon assimilation with identified metabolites, some proved to be satisfactory predictors of plant performance under drought and might be used for marker assisted breeding. Therefore, our study proves the importance of genotype as a major selection criterion of resistant plants to drought and provides empirical knowledge of the metabolic response involved. We also hypothesized the involvement of phenolics on response mechanisms under drought, which is worth to be explored to shed light on the metabolic pathways involved in plant response to water stress.

服务人员 孙小满

服务院士 尹伟伦

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