Potassium flux and leaf movement in Samanea saman. II. Phytochrome controlled movement.
Potassium flux and leaf movement in Samanea saman. II. Phytochrome controlled movement.
复制标题
Samanea saman 的钾通量和叶片运动。二.光敏色素控制运动。
DOI：
10.1085/jgp.64.4.431
复制
发表时间：
1974-10
影响因子：
3.8
通讯作者：
Galston, A W
中科院分区：
文献类型：
--
作者：
Satter, R L;Geballe, G T;Galston, A W
光敏色素是一种膜定位的胆蛋白，其构象通过短暂的红光或远红光处理可逆地改变，与节律振荡器相互作用以调节叶片运动和Samanea枕运动细胞中的钾通量。短暂暴露于红光（高Pfr水平）的变暗的pinnacle在伸肌区域的运动细胞中具有较少的钾，在屈肌区域的运动细胞中具有较多的钾，并且比暴露于远红光（低Pfr水平）的pinnacle具有较小的角度。温度从24°增加到37°增加了光处理在开放期间（能量阶段）的差异效应，但在关闭期间没有，这意味着光敏色素控制能量过程。光敏色素似乎与屈肌和伸肌细胞中节律性控制的钾泵相互作用。在白光照明的松垂的夜间闭合过程中，在变暗之前暴露于远红光比暴露于红光导致更大的角度。在有节奏的开放，所有的角度和光处理的差异效应随着温度的升高而增加。
Phytochrome, a membrane-localized biliprotein whose conformation is shifted reversibly by brief red or far-red light treatments, interacts with the rhythmic oscillator to regulate leaflet movement and potassium flux in pulvinal motor cells of Samanea. Darkened pinnae exposed briefly to red light (high Pfr level) have less potassium in motor cells in the extensor region, more potassium in motor cells in the flexor region, and smaller angles than those exposed to far-red light (low Pfr level). Increase in temperature from 24° to 37° increases the differential effect of the light treatments during opening (the energetic phase) but not during closure, implying that phytochrome controls an energetic process. It seems likely that phytochrome interacts with rhythmically controlled potassium pumps in flexor and extensor cells. During nyctinastic closure of white-illuminated pinnae, exposure to far-red light before darkening results in larger angles than does exposure to red. As in rhythmic opening, the angles of all pinnae and the differential effect of the light treatments increases with increasing temperature.