雨树的钾离子通量与叶片运动。I. 节律性运动。
Potassium flux and leaf movement in Samanea saman. I. Rhythmic movement.
作者信息
Satter R L, Geballe G T, Applewhite P B, Galston A W
出版信息
J Gen Physiol. 1974 Oct;64(4):413-30. doi: 10.1085/jgp.64.4.413.
Abstract
Samanea leaflets usually open in white light and fold together when darkened, but also open and dose with a circadian rhythm during prolonged darkness. Leaflet movement results from differential changes in the turgor and shape of motor cells on opposite sides of the pulvinus; extensor cells expand during opening and shrink during closure, while flexor cells shrink during opening and expand during closure but change shape more than size. Potassium in both open and closed pulvini is about 0.4 N. Flame photometric and electron microprobe analyses reveal that rhythmic and light-regulated postassium flux is the basis for pulvinar turgor movements. Rhythmic potassium flux during darkness in motor cells in the extensor region involves alternating predominance of inwardly directed ion pumps and leakage outward through diffusion channels, each lasting ca 12 h. White light affects the system by activating outwardly directed K(+) pumps in motor cells in the flexor region.
摘要
雨树的小叶通常在白光下张开，在黑暗中会合拢，但在长时间黑暗中也会以昼夜节律张开和闭合。小叶运动是由叶枕两侧运动细胞的膨压和形状的差异变化引起的；伸展细胞在张开时膨胀，在闭合时收缩，而弯曲细胞在张开时收缩，在闭合时膨胀，但形状变化大于大小变化。张开和闭合叶枕中的钾含量约为0.4N。火焰光度法和电子微探针分析表明，有节奏的和受光调节的钾通量是叶枕膨压运动的基础。在黑暗中，伸展区域运动细胞中有节奏的钾通量涉及向内定向离子泵的交替占主导地位以及通过扩散通道向外泄漏，每种情况持续约12小时。白光通过激活弯曲区域运动细胞中的向外定向K(+)泵来影响该系统。
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