Gravitropic response and circumnutation in pea (Pisum sativum) seedling roots.
Gravitropic response and circumnutation in pea (Pisum sativum) seedling roots.
复制标题
豌豆（Pisum sativum）幼苗根部的向地响应和回旋。
DOI：
10.1111/ppl.12406
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Takahashi H.
中科院分区：
文献类型：
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作者：
Kim HJ;Kobayashi A;Fujii N;Miyazawa Y;Takahashi H.
植物旋转是生长器官（例如芽和根）的螺旋运动。假设向地性反应在枝条旋转中充当外部振荡器，尽管这存在争议。根的回转运动和向地性反应之间的关系仍然未知。在这项研究中，我们使用 theageotropumpea (Pisum sativum) 突变体分析了向重力根的旋转，并将其与野生型 (cv. Alaska) 豌豆根的旋转进行了比较。我们通过去除重力感应组织（根冠）并用生长素转运抑制剂处理根部，进一步研究了向重力反应与阿拉斯加幼苗根部旋转的关系。阿拉斯加根表现出大约150分钟的回旋运动，而ageotropum根则没有表现出明显的回旋运动。去除阿拉斯加根中的根冠减少了重力反应和回旋运动。用生长素转运抑制剂 2,3,5-三碘苯甲酸 (TIBA) 和 N-(1-萘基)邻苯二甲酸 (NPA) 处理阿拉斯加根，可显着降低重力反应和回旋运动。这些结果表明重力调节的生长素运输参与豌豆幼苗根的旋转。
Plant circumnutation is a helical movement of growing organs such as shoots and roots. Gravitropic response is hypothesized to act as an external oscillator in shoot circumnutation, although this is subject to debate. The relationship between circumnutational movement and gravitropic response in roots remains unknown. In this study, we analyzed circumnutation of agravitropic roots using theageotropumpea (Pisum sativum) mutant, and compared it with that of wild‐type (cv. Alaska) pea roots. We further examined the relationship of gravitropic response to circumnutation of Alaska seedling roots by removing the gravisensing tissue (the root cap) and by treating the roots with auxin transport inhibitors. Alaska roots displayed circumnutational movements with a period of approximately 150 min, whereasageotropumroots did not exhibit distinct circumnutational movement. Removal of the root cap in Alaska roots reduced gravitropic response and circumnutational movements. Treatment of Alaska roots with auxin transport inhibitors, 2,3,5‐triiodobenzoic acid (TIBA) andN‐(1‐naphthyl)phthalamic acid (NPA), dramatically reduced gravitropic response and circumnutational movements. These results suggest that a gravity‐regulated auxin transport is involved in circumnutation of pea seedling roots.