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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Calcium changes in Robinia pseudoacacia pulvinar motor cells during nyctinastic closure mediated by phytochromes
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Calcium changes in Robinia pseudoacacia pulvinar motor cells during nyctinastic closure mediated by phytochromes

机译：植物植物晶体闭合期间罗宾西亚假毒性脉冲电池的钙变化

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摘要

Potassium pyroantimonate precipitation, transmission electron microscopy, and X-ray microanalysis were used to investigate the subcellular localization of loosely bound calcium in Robinia pseudoacacia pulvinar motor cells during phytochrome-mediated nyctinastic closure. Calcium localization was carried out in pulvini collected in white light 2h after the beginning of the photoperiod, immediately after a red light or a far-red light pulse applied 2h after the beginning of the photoperiod and after 15 or 25min of darkness respectively. Calcium antimonate precipitates were found in all the pulvinar tissues from the epidermis to the vascular bundle, independent of the light treatment. At subcellular level, precipitates were found mainly in the intercellular spaces, the inner surface of the plasma membrane, cytoplasm, colloidal vacuoles, and nuclei. Red light enhanced the nyctinastic closure of leaflets and caused an asymmetric distribution of cytosolic calcium precipitates between the extensor and flexor motor cells. Both the number and area of the cytosolic calcium precipitates drastically increased in the extensor cells compared to the flexor motor cells. Red light had a rapid and transient effect on the distribution of cytosolic calcium precipitates, which occurred during or at the end of the irradiation, before leaflet closure. By contrast, the distribution of cytosolic loosely bound calcium was similar between the extensor and flexor motor cells after irradiation with far-red light. Our results demonstrate that red light causes specific calcium mobilization in pulvinar motor cells and suggest the involvement of cytoplasmic Ca2+ as a second messenger for phytochrome during nyctinastic closure.
机译：使用Pyroantimonate沉淀，透射电子显微镜和X射线微基分析来研究在植物介导的乳膜闭合期间Robinia伪脉冲运动细胞松散结合钙的亚细胞定位。在光周期开始之后在白色光线2H中收集的钙定位，在光周期的开始之后，在光周期开始之后和在黑暗的15或25min之后施加2小时后，立即进行钙定位。在从表皮的所有Pulvinar组织中发现锑酸钙沉淀物，与血管束无关，与光处理无关。在亚细胞水平下，主要在细胞间隙中发现沉淀物，质膜的内表面，细胞质，胶体真空和核。红光增强了传单的浑线封闭，并导致延伸型和屈肌电池之间的细胞溶质钙的不对称分布。与屈伸电池电池相比，胞质钙钙的数量和面积沉淀在伸肌细胞中大大增加。红光对细胞溶质钙沉淀物的分布具有快速且瞬态的影响，在宣传夹之前发生在辐射之前或在辐射结束时发生的。相比之下，在用远红光照射后，伸肌和屈伸电池之间的细胞骨松散结合钙的分布在射门和屈伸电池之间类似。我们的结果表明，红光导致脉搏电机细胞中的特异性钙动员，并在乳房闭合期间表明细胞质CA2 +作为植物中的第二信使。

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