Plant growth regulation useful for plant production in arid environment

我们分离出七个拟南芥突变体（水-kussei：miz）的根向水性缺陷。我们描述了他们的表型，并确定了负责miz 1和miz 6突变的基因。miz 1和miz 6的根向水性受损，但向重力性、伸长生长和形态特征正常。这些结果表明，诱导向水性的途径是独立的向重力性。MIZ 1表型是由一个隐性突变引起的，它编码一种新的蛋白质，含有一个在陆生植物中高度保守的结构域（MIZ结构域）。我们假设MIZ 1进化到在适应陆地生命中发挥重要作用。此外，pMIZ 1：：GEIS融合基因在根冠的柱细胞中强烈表达，但不在伸长区，这表明MIZ 1在促水反应的早期阶段起作用。我们发现生长素反应是植物向水性和向重力性不可缺少的， ...更多信息 拟南芥根中生长素再分配的机制在向水性和向重力性之间存在差异。为了发挥这种反应，红芒麦的第一节间具有比其他品种更大的产生细胞的能力。结果表明，赤霉素对节间细胞的伸长和分裂都有一定的作用。然而，红芒麦第一节间的异常伸长是由于细胞分裂而不是细胞伸长。基于这些结果，我们现在正在研究红芒麦耐深播的分子机制。植物对重力做出反应以控制其生长方向。我们发现，重力感应是所需的回旋和缠绕反应在牵牛花和富含甘氨酸的蛋白质（CsGRP 1）和生长素介导的转录（CsARF 2和CsARF 5）在黄瓜幼苗PEG形成的重力调节中发挥作用。少

We isolated seven Arabidopsis mutants (mizu-kussei : miz) defective in root hydrotropism. We characterized their phenotypes and identified genes responsible for the mutations of miz1 and miz6. Roots of both miz1 and miz6 showed impaired hydrotropism, but their gravitropism, elongation growth and morphological feature were normal. These results suggest that the pathway inducing hydrotropism is independent of gravitropism. MIZ1 phenotype resulted from a single recessive mutation, which encoded a novel protein containing a domain (the MIZ domain) that was highly conserved among terrestrial plants. We hypothesized that MIZ1 evolved to play an important role in adaptation to terrestrial life. In addition, a pMIZ1::GEIS fusion gene was strongly expressed in columella cells of the root cap but not in the elongation zone, suggesting that MIZ1 functions in the early phase of the hydrotropic response. We found that auxin response is indispensable for both hydrotropism and gravitropism, but mecha … More nisms for auxin redistribution differ between hydrotropism and gravitropism in Arabidopsis roots.A variety of wheat, Hong Mang Mai, exhibits tolerance to deep-sowing conditions by extreme elongation of the first internodes in soil. To exert this response, the first internodes of Hong Mang Mai possessed greater ability to produce cells, compared to other varieties. It was revealed that gibberellin plays roles in both cell elongation and cell division of the internodes. However, extraordinary elongation of the first internodes of Hong Mang Mai occurred due to cell division rather than cell elongation. Based on these results, we are now studying molecular mechanisms for the deep-sowing tolerance of Hong Mang Mai.Plants respond to gravity for controlling their growth orientation. We found that gravisensing is required for circumnutation and winding response in morning glory and that glycine-rich protein (CsGRP1) and auxin-mediated transcription (CsARF2 and CsARF5) play roles in the gravity regulation of peg formation in cucumber seedlings. Less