Starch deficiency in tomato causes transcriptional reprogramming that modulates fruit development, metabolism, and stress responses

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Starch deficiency in tomato causes transcriptional reprogramming that modulates fruit development, metabolism, and stress responses
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From ground-hugging to groundbreaking: How a unique tomato mutation could transform sustainable agriculture BTIscience JXBot

Tomato fruit store carbon as starch during early development and mobilize it at the onset of ripening. Starch accumulation has been suggested to buffer fluctuations in carbon supply to the fruit under abiotic stress, and contribute to sugar levels in ripe fruit. However, the role of starch accumulation and metabolism during fruit development is still unclear.

The disruption of starch biosynthesis causes major transcriptional and metabolic remodeling infruit but only minor effects on fruit size and ripening. Changes in gene expression and metabolite profiles indicate that the lack of carbon flow into starch increases levels of soluble sugars during fruit growth, triggers a readjustment of central carbohydrate and lipid metabolism, and activates growth and stress protection pathways.

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