Wounding enhances expression of AtSUC3, a sucrose transporter from Arabidopsis sieve elements and sink tissues
Wounding enhances expression of AtSUC3, a sucrose transporter from Arabidopsis sieve elements and sink tissues
复制标题
DOI：
10.1104/pp.103.033399
复制
发表时间：
2004-02-01
期刊：
影响因子：
7.4
通讯作者：
Sauer, N
中科院分区：
文献类型：
--
作者：
Meyer, S;Lauterbach, C;Sauer, N
Arabidopsis AtSUC 3基因编码一种蔗糖（Suc）转运蛋白，该转运蛋白在大小和内含子数量上与所有其他Arabidopsis Suc转运蛋白不同。到目前为止，每种植物都有一种这种特殊类型的转运蛋白，并讨论了这些蛋白的几种功能，包括跨膜Suc转运的催化，以及Suc传感和其他Suc转运蛋白的调节。在这里，我们表明，AtSUC3蛋白是本地化的拟南芥韧皮部的筛元件，并不与伴侣细胞特异性AtSUC2韧皮部装载机共定位。在许多库细胞和组织中观察到甚至更强的AtSUC3表达，如保卫细胞、毛状体、萌发的花粉、根尖、发育中的种皮或托叶。此外，AtSUC3的表达强烈诱导损伤后的拟南芥组织。AtSUC3在这些不同的细胞和组织中的生理作用进行了讨论。
The Arabidopsis AtSUC3 gene encodes a sucrose (Suc) transporter that differs in size and intron number from all other Arabidopsis Suc transport proteins. Each plant species analyzed so far possesses one transporter of this special type, and several functions have been discussed for these proteins, including the catalysis of transmembrane Suc transport, and also Suc sensing and regulation of other Suc transporters. Here, we show that the AtSUC3 protein is localized in the sieve elements of the Arabidopsis phloem and is not colocalized with the companion cell-specific AtSUC2 phloem loader. Even stronger AtSUC3 expression is observed in numerous sink cells and tissues, such as guard cells, trichomes, germinating pollen, root tips, the developing seed coat, or stipules. Moreover, AtSUC3 expression is strongly induced upon wounding of Arabidopsis tissue. The physiological role of AtSUC3 in these different cells and tissues is discussed.