Sugar and metabolic regulation of genes for sucrose metabolism: Potential influence of maize sucrose synthase and soluble invertase responses on carbon partitioning and sugar sensing
Sugar and metabolic regulation of genes for sucrose metabolism: Potential influence of maize sucrose synthase and soluble invertase responses on carbon partitioning and sugar sensing
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DOI：
10.1093/jxb/47.special_issue.1179
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发表时间：
1996-08-01
影响因子：
6.9
通讯作者：
Xu, J
中科院分区：
文献类型：
--
作者：
Koch, KE;Wu, Y;Xu, J
蔗糖代谢的两条途径的基因的糖响应性不仅可以为利用输入碳的第一步的转录调节提供机制，而且可以为改变糖传感系统的信号提供机制。这一假说通过比较（1）玉米蔗糖合成酶和转化酶基因之间的糖调节，（2）它们的组织表达的对比模式，和（3）它们对其他糖反应基因效应子产生的影响来检验。玉米lvr1和lvr2转化酶基因的克隆和鉴定表明，这两个基因属于玉米可溶性转化酶基因家族的不同亚家族。此外，玉米转化酶可以与蔗糖脱氢酶（Sh1和Sus1）的基础上共享模式的差异糖反应性和组织特异性表达。这种比较的扩展，包括从其他物种的蔗糖代谢基因揭示了更广泛的关联饥饿耐受的表达和组织分布的限制模式。考虑到目前的植物糖传感系统和运输途径的模型表明，在细胞中的蔗糖裂解的网站和机制可能会影响产生的信号的大小和类型。
Sugar responsiveness of genes for both paths of sucrose metabolism could provide a mechanism not only for transcriptional regulation of the first step in the use of imported carbon, but also for altering signals to the sugar-sensing system. This hypothesis was examined by comparison of (1) sugar regulation among maize genes for sucrose synthase and invertase, (2) their contrasting patterns of tissue expression, and (3) their influence on production of effecters for other sugar-responsive genes. Cloning and characterization of the lvr1 and lvr2 invertase genes of maize indicated that these genes belong to distinct subfamilies of the maize soluble invertase gene family. In addition, maize invertases can be grouped with the sucrose synthases (Sh1 and Sus1) on the basis of shared patterns of differential sugar-responsiveness and tissue-specific expression. Extension of this comparison to include genes for sucrose metabolism from other species revealed a more widespread association between starvation-tolerant expression and restricted patterns of tissue distribution. Consideration of current models for plant sugar-sensing systems and transport pathways suggested that the site and mechanism of sucrose cleavage in the cell could affect the magnitude and type of signal generated.