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首页> 外文期刊>Journal of Experimental Botany >FaMYB44.2, a transcriptional repressor, negatively regulates sucrose accumulation in strawberry receptacles through interplay with FaMYB10
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FaMYB44.2, a transcriptional repressor, negatively regulates sucrose accumulation in strawberry receptacles through interplay with FaMYB10

机译：通过与FAMYB10的相互作用，对转录阻遏物进行转录阻遏物，对草莓插座中的蔗糖积累进行负面调节蔗糖积累

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摘要

Sugar and acid metabolism are critical for fruit ripening and quality formation, but the underlying regulatory mechanisms are largely unknown. Here, we identified a transcriptional repressor, FaMYB44.2, that regulates sugar and acid accumulation in strawberry (Fragaria x ananassa 'Benihoppe') receptacles. We transiently expressed FaMYB44.2 in strawberry fruit and conducted metabolic and molecular analyses to explore the role of FaMYB44.2 in sugar and acid accumulation in strawberry. We found that FaMYB44.2 negatively regulates soluble sugar accumulation and malic acid content and represses the expression of numerous structural genes, including FaSPS3, a key gene in sucrose accumulation. From the white fruit stage onwards, the repressive effect of FaMYB44.2 on FaSPS3 is reversed by FaMYB10, which positively regulates anthocyanin accumulation. Our results indicate that FaMYB10 suppresses FaMYB44.2 expression; weakens the interaction between FaMYB44.2 and its co-repressor, FabHLH3; and cooperates with FabHLH3 to activate the expression of FaSPS3. The interplay between FaMYB10 and FaMYB44.2 results in sucrose accumulation in ripe strawberry fruits. In addition, the repressive effect of FaMYB44.2 on sucrose accumulation is enhanced by jasmonic acid. This study provides new insights into the regulatory mechanisms of sucrose accumulation and sheds light on the interplay between regulatory proteins during strawberry fruit ripening and quality formation.
机译：糖和酸代谢对于果实成熟和质量形成至关重要，但潜在的调节机制在很大程度上是未知的。在这里，我们鉴定了调节糖和酸积聚在草莓（Fragaria x Ananassa'Benihoppe'）容器中的转录抑制剂FamyB44.2。我们在草莓果实中瞬间表达了Famyb44.2，并进行了代谢和分子分析，以探讨FamyB44.2在草莓中糖和酸积累的作用。我们发现FamyB44.2负调节可溶性糖积累和苹果酸含量，并抑制许多结构基因的表达，包括Fasps3，蔗糖积累中的关键基因。从白果阶段开始，FASPS3上的FAMYB44.2对FAMYB10的抑制作用是通过FAMYB10逆转的，这为持续调节了花青素积累。我们的结果表明，FamyB10抑制了FamyB44.2表达;削弱FamyB44.2与其共压制性的互动，FabhlH3;并与FabhlH3合作以激活Fasps3的表达。 FamyB10和FamyB44.2之间的相互作用导致成熟草莓水果中的蔗糖积累。此外，茉莉酸增强了FamyB44.2对蔗糖积累的抑制作用。本研究为蔗糖积聚的监管机制提供了新的见解，并在草莓果实成熟和质量形成期间对调节蛋白的相互作用进行了脱落。

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