Phototropism and gravitropism in lateral roots of Arabidopsis
Phototropism and gravitropism in lateral roots of Arabidopsis
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DOI：
10.1093/pcp/pcf017
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发表时间：
2002-01-01
影响因子：
4.9
通讯作者：
Roth, KK
中科院分区：
文献类型：
--
作者：
Kiss, JZ;Miller, KM;Roth, KK
向重力性，并在较小程度上，向光性的特点是在主根，但鲜为人知的是，这些向性侧根的结构/功能方面。因此，在这项研究中，我们报告了在拟南芥侧根的向性反应。侧根最初是斜向重力性的，但当它们达到约10 mm的长度时，这些根向下生长并表现出正向重力性。光学和电子显微镜研究表明，野生型植物中正向重力性与具有大型沉积淀粉体的轴细胞发育之间存在相关性。侧根对白色和蓝光表现出负向光性，对红光表现出正向光性。与初生根的情况一样，光反应相对于重力反应较弱，但向光性在向重力性受损的无淀粉突变体植物中很明显。据我们所知，这是首次报道植物侧根的向光性。
Gravitropism and, to a lesser extent, phototropism have been characterized in primary roots, but little is known about structural/functional aspects of these tropisms in lateral roots. Therefore, in this study, we report on tropistic responses in lateral roots of Arabidopsis thaliana. Lateral roots initially are plagiogravitropic, but when they reach a length of approximately 10 mm, these roots grow downward and exhibit positive orthogravitropism. Light and electron microscopic studies demonstrate a correlation between positive gravitropism and development of columella cells with large, sedimented amyloplasts in wild-type plants. Lateral roots display negative phototropism in response to white and blue light and positive phototropism in response to red light. As is the case with primary roots, the photoresponse is weak relative to the graviresponse, but phototropism is readily apparent in starchless mutant plants, which are impaired in gravitropism. To our knowledge, this is the first report of phototropism of lateral roots in any plant species.