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Blue-light-induced rapid chloroplast de-anchoring in Vallisneria epidermal cells

Journal of Integrative Plant Biology 2015年第1期57卷 93-105页

作者： Yuuki Sakai Shin-Ichiro Inoue Akiko Harada Ken-Ichiro Shimazaki Shingo Takagi department of Biological Sciences Graduate School of Science Osaka University Division of Biological Science Graduate School of Science Nagoya University department of Biology Osaka Medical College department of Biology Faculty of Science Kyushu University

In the outer periclinal cytoplasm of leaf epidermal cells of an aquatic angiosperm Vallisneria, blue light induces ＂chloroplast de-anchoring＂, a rapid decline in the resistance of chloroplasts against centrifugal force. chloroplast de- anchoring is known induced within lmin of irradiation with high-fluence-rate blue light specifically, preceding the com- mencement of chloroplasts migration toward the anticlinal cytoplasm. However, its regulatory mechanism has remained elusive, although pharmacological analysis suggested that a calcium release from intracellular calcium stores is necessary for the response, in search of the responsible photoreceptors, immunoblotting analysis using antibodies against phototropins demonstrated that cross-reactive polypeptides of 120-kDa exist in the plasma-membrane fraction prepared from the leaves. In vitro phosphorylation analysis revealed that 120-kDa polypeptides were phosphorylated by exposure to blue light in a fluence-dependent manner. The blue-light-induced phosphorylation activity was sensitive to a Ser/Thr kinase inhibitor, staurosporine, and unusually was retained at a high level for a long time in darkness. Furthermore, phototropin gene homologs （Vallisneria PHOTOTROPINI and PHOTOTROPIN2） expressed in leaves were isolated. We propose that calcium- regulated chloroplast de-anchoring, possibly mediated by phototropins, is an initial process of the blue-light-induced avoidance response of chloroplasts in Vallisneria.

关键词： Avoidance response of chloroplasts blue-light response chloroplast de-anchoring cytoplasmic calcium phototropin

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