HvLBD19基因对大麦不定根发育的调控

Regulation of adventitious root development by HvLBD19 gene in barley(Hordeum vulgare L.)

植物LBD基因家族是植物特异的转录因子家族,在调控植物生长发育和氮素代谢方面起到重要的作用。基因组共线性分析表明,大麦(Hordeum vulgare L.)HvLBD19基因为水稻ARL1和玉米RTCS基因直系同源基因。基因时空表达分析结果表明,该基因在不定根中表达丰度最高,且受外源生长素诱导表达,所编码蛋白定位于细胞核内。转基因功能验证结果表明,苗期超表达株系相对于野生型不定根长度增长近1倍,不定根数目增加40%。本研究初步明确了HvLBD19基因影响大麦不定根发育,为进一步深入探究大麦HvLBD19基因调控不定根发育的分子机制提供了基础。

LBD gene family is a plant specific transcription factor family,which plays an important role in regulating plant development and nitrogen metabolism.Micro-synteny analysis showed that barley HvLBD19 was an orthologous of maize RTCS and rice ARL1 gene.Temporal and spatial expression analysis revealed that this gene was most abundant in adventitious roots and was induced by exogenous auxin treatment,which encoded a protein located in the nucleus.Transgenic results indicated that the adventitious root length increased by nearly one time,and the number of adventitious roots increased by 40%.It was preliminarily confirmed that HvLBD19 gene controlled adventitious root development in barley and provided a foundation for further research on the molecular mechanism of HvLBD19 gene in regulating adventitious root development in barley.