Photophobic behavior of maize roots
Photophobic behavior of maize roots
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DOI：
10.4161/psb.21012
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发表时间：
2012-01-01
影响因子：
2.9
通讯作者：
Baluska, Frantisek
中科院分区：
文献类型：
--
作者：
Burbach, Christian;Markus, Katharina;Baluska, Frantisek
当玉米幼苗的初生根被放置在斜坡上或整个幼苗被倒立时，它们表现出特殊的生长行为。重要的是，这种行为取决于光照条件。如果在黑暗中把树根放在斜坡上，它们会表现出“爬行”的行为，并迅速沿着斜坡向上移动。然而，一旦这些根被照亮，它们沿着水平路径爬行的速度就减慢了，而是试图沿着重力矢量向下生长。当把根放在薄的玻璃毛细血管中时，观察到根的行为发生了类似的光诱导开关。只要它们被保持在黑暗中，它们就会在重力矢量的作用下快速生长。如果被照亮，这些倒立的根迅速完成u型转弯，沿着重力矢量向下生长，最终从毛细血管中逃脱，到达它们的开放端。去冠根虽然生长旺盛，但不表现出这些光诱导的疏光生长反应。因此，完整的根冠对玉米根系的避光行为至关重要。
Primary roots of young maize seedlings showed peculiar growth behavior when challenged by placing them on a slope, or if whole seedlings were turned upside down. Importantly, this behavior was dependent on the light conditions. If roots were placed on slopes in the dark, they performed "crawling" behavior and advanced rapidly up the slope. However, as soon as these roots were illuminated, their crawling movements along their horizontal paths slowed down, and instead tried to grow downwards along the gravity vector. A similar light-induced switch in the root behavior was observed when roots were inverted, by placing them in thin glass capillaries. As long as they were kept in the darkness, they showed rapid growth against the gravity vector. If illuminated, these inverted roots rapidly accomplished U-turns and grew down along the gravity vector, eventually escaping from the capillaries upon reaching their open ends. De-capped roots, although growing vigorously, did not display these light-induced photophobic growth responses. We can conclude that intact root cap is essential for the photophobic root behavior in maize.