Integration of Environmental and Developmental (or Metabolic) Control of Seed Mass by Sugar and Ethylene Metabolisms in Arabidopsis,Journal of Agricultural and Food Chemistry

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Integration of Environmental and Developmental (or Metabolic) Control of Seed Mass by Sugar and Ethylene Metabolisms in Arabidopsis
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acs.jafc.7b05992
Lai-Sheng Meng ₁ , Meng-Ke Xu ₁ , Wen Wan ₁ , Jing-Yi Wang ₁

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In higher plants, seed mass is an important to evolutionary fitness. In this context, seedling establishment positively correlates with seed mass under conditions of environmental stress. Thus, seed mass constitutes an important agricultural trait. Here, we show loss-of-function of YODA (YDA), a MAPKK Kinase, and decreased seed mass, which leads to susceptibility to drought. Furthermore, we demonstrate that yda disrupts sugar metabolisms but not the gaseous plant hormone, ethylene. Our data suggest that the transcription factor EIN3 (ETHYLENE-INSENSITIVE3), integral to both sugar and ethylene metabolisms, physically interacts with YDA. Further, ein3-1 mutants exhibited increased seed mass. Genetic analysis indicated that YDA and EIN3 were integral to a sugar-mediated metabolism cascade which regulates seed mass by maternally controlling embryo size. It is well established that ethylene metabolism leads to the suppression of drought tolerance by the EIN3 mediated inhibition of CBF1, a transcription factor required for the expression genes of abiotic stress. Our findings help guide the synthesis of a model predicting how sugar/ethylene metabolisms and environmental stress are integrated at EIN3 to control both the establishment of drought tolerance and the production of seed mass. Collectively, these insights into the molecular mechanism underpinning the regulation of plant seed size may aid prospective breeding or design strategies to increase crop yield.

中文翻译：

拟南芥中糖和乙烯代谢对种子质量的环境和发育（或代谢）控制的整合。

在高等植物中，种子质量对进化适应性很重要。在这种情况下，在环境胁迫条件下，幼苗的生长与种子质量成正相关。因此，种子质量构成重要的农业特性。在这里，我们显示了YODA（YDA），MAPKK激酶的功能丧失和种子质量下降，这导致了对干旱的敏感性。此外，我们证明了yda会破坏糖的代谢，但不会破坏气态植物激素乙烯。我们的数据表明，糖和乙烯代谢必不可少的转录因子EIN3（ETHYLENE-INSENSITIVE3）与YDA发生物理相互作用。此外，ein3-1突变体表现出增加的种子质量。遗传分析表明，YDA和EIN3对糖介导的代谢级联反应是不可或缺的，后者通过母体控制胚胎大小来调节种子质量。众所周知，乙烯代谢会通过EIN3介导的CBF1抑制作用而抑制干旱耐受性，CBF1是非生物胁迫表达基因所需的转录因子。我们的发现有助于指导模型的合成，该模型预测EIN3如何整合糖/乙烯代谢和环境胁迫，以控制干旱耐受性的建立和种子质量的产生。总而言之，这些对支持植物种子大小调控的分子机制的见解可能有助于前瞻性育种或设计策略，以增加农作物的产量。

更新日期：2018-03-12

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