Expansion of Vaucheria Cell Apex Caused by Blue or Red Light

概要

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Vaucheria geminata shows typical tip-growth. Symmetrical irradiation of the cell apex with strong blue or red light caused expansion at the very apex. The apical expansion required not only a large dosage, but also a long duration (>5 min), of irradiation. The expansion took place ca. 6 min after the onset of light treatment. The action spectrum for the response revealed that blue light was the most effective: red light was two orders of magnitude less effective. DCMU completely cancelled the expansion effect of red light, yet the drug totally failed to inhibit the effect of blue light. The expansion is thus controlled by both the blue light-absorbing pigment system and photosynthesis. The expansion is a three-dimensional growth promotion event, i.e., it is accompanied by simultaneous longitudinal growth. Blue light caused another longitudinal growth promotion, a positive light-growth response. The light-growth response is the first found in such a tip-growing cell.
日本植物生理学会の論文