玉米非生物逆境响应基因ZmASK1的克隆及表达特性分析

类Shaggy/GSK-3蛋白激酶基因在植物发育和逆境应答中起着十分重要的作用。通过RT-PCR方法从玉米中克隆了一个与Shaggy/GSK-3蛋白激酶基因同源的全长cDNA, 命名为ZmASK1(abiotic stress-induced kinase)(GenBank accession No., AY722707)。推测ZmASK1蛋白含有426个氨基酸, 分子量为48.5 kD, 等电点为8.7。半定量RT-PCR分析表明, ZmASK1可以被甘露醇、高盐和脱落酸(ABA)诱导。另外, 在不同的组织中, ZmASK1的表达模式也不一样, 在子房中的表达量最高。这些结果表明, ZmASK1可能在植物逆境反应及生殖生育过程中起多重作用。本文是玉米类Shaggy/GSK-3蛋白激酶基因参与胁迫和发育过程的首次报道。

Cloning and Characterization of Maize ZmASK1, a Homologue to Shaggy/GSK-3-like Gene, Involved in Plant Responses to Abiotic Stresses

Shaggy/GSK-3-like genes play important roles in plant development and stress responses. One full-length cDNA encoding a shaggy/GSK-3 homologue was isolated from maize (Zea mays L.) by RT-PCR and named as ZmASK1 (for abiotic stress-induced kinase). The predicted ZmASK1 protein has 426 amino acids with an estimated molecular mass of 48.5 kD and an isoelectric point of 8.7. RT-PCR analysis showed that the ZmASK1 expression was induced by mannitol, salt and abscisic acid (ABA). Furthermore, in different tissues the ZmASK1 showed different expression patterns and was most abundant in ovaries. These results suggest that ZmASK1 may play multiple roles in abiotic resistance pathways, as well as in plant reproductive development. This is the first shaggy/GSK-3-like gene associated with stresses and development reported in maize.