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. 2022 May 10;9:uhac102. doi: 10.1093/hr/uhac102

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© The Author(s) 2022. Published by Oxford University Press on behalf of Nanjing Agricultural University

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Model proposed for ABA-regulated ‘Keitt’ fruit ripening. With ‘Keitt’ fruit development, the content of endogenous ABA gradually increases and reaches a peak in the ripening stage. Endogenous ABA induces the expression of MiHY5 and other TFs. Subsequently, MiHY5 directly binds to the promoter cis-regulatory elements of ripening-associated genes to activate their expression. These ripening-associated genes are mainly involved in the sucrose metabolism process, cell wall degradation, fruit softening process, β-carotenoid accumulation, and starch degradation.