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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Gravity perception requires statoliths settled on specific plasma membrane areas in characean rhizoids and protonemata
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Gravity perception requires statoliths settled on specific plasma membrane areas in characean rhizoids and protonemata

机译：重力感知需要在石斑鱼根状茎和原生质体的特定质膜区域上沉积石笋

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The noninvasive infrared laser micromanipulation technique (optical tweezers, optical trapping) and centrifugation were used to study susception and perception, the early events in the gravitropic pathway of tip-growing characean rhizoids and protonemata. Reorientation of the growth direction in both cell types was only initiated when at least 2-3 statoliths settled on specific areas of the plasma membrane. This statolith-sensitive plasma membrane area is confined to the statolith region (10-35 mum behind the tip) in positively gravitropic rhizoids, whereas in negatively gravitropic protonemata, this area is limited to the apical plasma membrane (0-10 mum). Statolith sedimentation towards the sensitive plasma membrane areas is mediated by the concerted action of actin and gravity. The process of sedimentation, the pure physical movement, of statoliths is not sufficient to initiate graviresponses in both cell types. It is concluded that specific statolith-sensitive plasma membrane areas play a crucial role in the signal transduction pathway of gravitropism. These areas may represent the primary sites for gravity perception and may transform the information derived from the gravity-induced statolith sedimentation into physiological signals which trigger the molecular mechanisms of the opposite graviresponses in characean rhizoids and protonemata. [References: 31]
机译：使用无创红外激光显微操作技术（光镊，光学诱捕）和离心技术研究敏感和知觉，尖端生长的ace类根状茎和原生质体的重力运动的早期事件。仅当至少2-3个针状石沉积在质膜的特定区域时，才启动两种细胞类型中生长方向的重新定向。对正重力的根状茎，该对层石敏感的质膜区域仅限于层状石区域（尖端后10-35 mum），而在负向质子性前体细胞中，该区域限于顶质膜（0-10 mum）。肌动蛋白和重力的协同作用介导了朝向敏感质膜区域的石蜡沉积。层状石的沉积过程（纯粹的物理运动）不足以引发两种细胞类型中的重力反应。结论是特定的对石蜡敏感的质膜区域在重力的信号转导途径中起着至关重要的作用。这些区域可能代表了重力感知的主要场所，并且可能将源自重力诱导的针状石沉积的信息转换为生理信号，从而触发恰拉希亚类根瘤和原生质体中相反的重力反应的分子机制。 [参考：31]

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