An irradiation with visible light can alter the gravitropic responsiveness of shoots and roots. This indicates that light must affect some biochemical process in plant cells which is the same as, or importantly influences, a biochemical process that regulates gravitropism. In many cases, the light receptor for this effect is the pigment phytochrome, which initiates a variety of important photomorphogenic responses in plants. Recent results suggest that both gravistimulation and phytochrome photoactivation result in altered Ca2+ transport into and out of the affected cells. This article reviews the evidence that these Ca2+ fluxes may be the common biochemical process which modulates both gravitropism and photomorphogenesis.

中文翻译：

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控制光刺激向重性的细胞机制：钙的作用

可见光照射可以改变芽和根的向地响应性。这表明光必须影响植物细胞中的某些生化过程，这与调节向地性的生化过程相同，或者重要的是影响。在许多情况下，这种效应的光受体是色素光敏色素，它在植物中引发各种重要的光形态发生反应。最近的结果表明重力刺激和光敏色素光活化都会导致 Ca2+ 转运进出受影响细胞的改变。本文回顾了这些 Ca2+ 通量可能是调节向地性和光形态发生的常见生化过程的证据。