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首页> 外文期刊>Acta Physiologiae Plantarum >Hormone and sugar effects on rice sucrose transporter OsSUT1 expression in germinating embryos
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Hormone and sugar effects on rice sucrose transporter OsSUT1 expression in germinating embryos

机译：激素和糖对发芽胚中水稻蔗糖转运蛋白OsSUT1表达的影响

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The rice (Oryza sativa L.) OsSUT1 gene encodes a sucrose transporter protein. OsSUT1 was suggested to contribute to phloem loading of sucrose. OsSUT1 expression is highly induced in embryos after seeds were imbibed in water and peaked at 2 days after imbibition, but mRNA levels decline gradually afterwards. In this study, we demonstrated that phytohormones and sugars regulate OsSUT1 expression. Antagonism of abscisic acid and gibberellic acid appeared to play an important role in regulating OsSUT1 expression during embryo germination. In addition, our data showed a glucose and sucrose effect on OsSUT1 expression that represented a bi-phase process. Initially, glucose and sucrose functioned as negative regulators of OsSUT1 expression in germinating embryos after a 1-day treatment; however, when the treatment duration was extended to 5 days, OsSUT1 expression was significantly enhanced. Therefore, we hypothesized that the glucose and sucrose effect might occur in combination with other side effects, such as changes in hormone content or catabolism. Based on the effects that sugar analogs have on OsSUT1 expression, we suggest that the signal transduction for regulating glucose-responsive OsSUT1 expression in embryos occurs via a hexokinase-mediated pathway.
机译：水稻（Oryza sativa L.）OsSUT1基因编码蔗糖转运蛋白。 OsSUT1被认为有助于蔗糖韧皮部的负载。种子在水中吸收后，OsSUT1表达在胚胎中被高度诱导，并在吸收后2天达到峰值，但随后mRNA水平逐渐下降。在这项研究中，我们证明了植物激素和糖调节OsSUT1的表达。脱落酸和赤霉素的拮抗作用似乎在胚胎萌发期间在调节OsSUT1表达中起重要作用。另外，我们的数据显示葡萄糖和蔗糖对OsSUT1表达的影响，该过程代表了一个双相过程。最初，经过1天的处理，葡萄糖和蔗糖起OsSUT1在发芽胚胎中表达的负调控作用。但是，当治疗时间延长至5天时，OsSUT1表达显着增强。因此，我们假设葡萄糖和蔗糖的作用可能与其他副作用（例如激素含量或分解代谢的改变）结合出现。基于糖类似物对OsSUT1表达的影响，我们建议调节己糖激酶在胚胎中的葡萄糖反应性OsSUT1表达的信号转导是通过己糖激酶介导的途径发生的。

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