Abstract
Plant metabolism is altered in response to various environmental changes. In vegetable crops such as tomato (Solanum lycopersicum), the metabolic composition of fruits varies depending on the variety or cultivar as well as the cultivation method used. Few studies have examined the metabolic fluctuations in fruits under stress conditions, such as drought. We previously examined the metabolomes of mature green tomato fruits, which undergo drastic changes in chemical composition during ripening, and mature red fruits in response to drought stress. We detected or predicted fluctuations in the levels of fatty acids and phospholipid constituents, such as inositol and ethanolamine. In this study, we determined the localizations of these metabolites in fruits using mass spectrometry imaging. The accumulation patterns of stearic acid and palmitic acid were similar, but unlike these fatty acids, oleic acid accumulated to high levels in the placenta. Inositol is involved in various physiological processes; under drought conditions, this metabolite is synthesized by a different pathway compared to under normal conditions. The biosynthesis of pectin, a component of the gel surrounding the seeds, was suppressed under drought stress but increased in seeds. We propose that under drought conditions, a shift to phospholipid biosynthesis occurs that protects seeds from dehydration.
Highlights
These findings suggest that the biosynthesis of phospholipids in cell membranes increases in response to drought stress [9]
Acids tomato fruit grown on plants subjected or not to drought stress
Palmitic acid accumulated throughout the fruit tomato fruit grown on plants subjected or not to drought stress
Summary
Plant metabolism is altered in response to various environmental changes In vegetable crops such as tomato (Solanum lycopersicum), the metabolic composition of fruits varies depending on the variety or cultivar as well as the cultivation method used. We previously examined the metabolomes of mature green tomato fruits, which undergo drastic changes in chemical composition during ripening, and mature red fruits in response to drought stress. Apart from functioning in drought tolerance, these solutes affect fruit texture [5] In vegetable crops such as tomato, the metabolic composition of fruits changes in response to drought or salt stress during fruit development [3,7]. Cell wall- and cell membrane-related genes were upregulated by drought stress These findings suggest that the biosynthesis of phospholipids in cell membranes increases in response to drought stress [9]
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