植物の刺激応答反応系におけるアセチルコリン : II. 熱ストレス下のトウモロコシ子葉鞘節細胞における Ca<SUP>2+</SUP> 移動

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  • Acetylcholine as a Signaling System to Environmental Stimuli Plants. II. Ca2+ movement in the coleoptile node cells of heat-stressed Zea mays seedlings.
  • Acetylcholine as a Signaling System to Environmental Stimuli in Plants(2)Ca2+ movement in the coleoptile node cells of heat-stressed Zea mays Seedlings
  • Acetylcholine as a Signaling System to

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The acetylcholine (ACh) -acetylcholine receptor system requires the presence of acetylcholinesterase (AChE) and Ca2+ as a trigger of ACh release at the plasmodesmatal junction between the stele and cortex in plants. In this work, Ca2+ movement and cytochemical AChE activity were detected in the coleoptile node cells of maize seedlings following heat stress. Fluorescent Ca2+ labeled with calcium green was detected in the cells with a laser scanning confocal microscope. The labeled Ca2+ in the coleoptile node cells was found mainly in starch grains. Heat stress remarkably increased labeled Ca2+ in the endodermal and cortical cells. Most of the starch grains in the endodermal cells lost shape immediately after the treatment of heat stress, and the crumbling starch grains exuded labeled Ca2+ into the cells. From the results, the Ca2+ in starch grains can be activated by heat stress, and consequently, the released Ca2+ can induce an elevation of Ca2+ concentration in the cells. Further, the endodermal cells rapidly responded to heat stress as compared to the cortical cells. The AChE activity in the endodermal cells also greatly increased after heat stress. Therefore, the appearance of Ca2+ in endodermal cells after heat stress can be correlated to its function as a trigger for ACh release.

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