חיפוש מתקדם
Plant and Cell Physiology
Lahav, M., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Abu-Abied, M., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Belausov, E., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Schwartz, A., Robert H. Smith Inst. Plant Sci. G., Fac. Agric., Food and Environ. Sci., Hebrew University of Jerusalem, Rehovot, Israel
Sadot, E., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Guard cells of stomata are characterized by ordered bundles of microtubules radiating from the ventral side toward the dorsal side of the cylindrical cell. It was suggested that microtubules play a role in directing the radial arrangement of the cellulose micro-fibrils of guard cells. However, the role of microtubules in daily cycles of opening and closing of stomata is not clear. The organization of microtubules in guard cells of Commelina communis leaves was studied by analysis of three-dimensional immunofluorescent images. It was found that while guard cell microtubules in the epidermis of leaves incubated in the light were organized in parallel, straight and dense bundles, in the dark they were less straight and oriented randomly near the stomatal pore. The effect of blue and red light on the organization of guard cell microtubules resembled the effects of white light and dark respectively. When stomata were induced to open in the dark with fusicoccin, microtubules remained in the dark configuration. Furthermore, when incubated in the light, guard cell microtubules were more resistant to oryzalin. Similarly, microtubules of Arabidopsis guard cells, expressing green fluorescent protein-tubulin α 6, were disorganized in the dark, but were organized in parallel arrays in the presence of white light. The dynamics of microtubule rearrangement upon transfer of intact leaves from dark to light was followed in single stomata, showing that an arrangement of microtubules typical for light conditions was obtained after 1 h in the light. Our data suggest that microtubule organization in guard cells is responsive to light signals.
פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
Microtubules of guard cells are light sensitive
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Lahav, M., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Abu-Abied, M., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Belausov, E., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Schwartz, A., Robert H. Smith Inst. Plant Sci. G., Fac. Agric., Food and Environ. Sci., Hebrew University of Jerusalem, Rehovot, Israel
Sadot, E., Dept. of Ornamental Horticulture, Volcani Center, Bet-Dagan 50250, Israel
Microtubules of guard cells are light sensitive
Guard cells of stomata are characterized by ordered bundles of microtubules radiating from the ventral side toward the dorsal side of the cylindrical cell. It was suggested that microtubules play a role in directing the radial arrangement of the cellulose micro-fibrils of guard cells. However, the role of microtubules in daily cycles of opening and closing of stomata is not clear. The organization of microtubules in guard cells of Commelina communis leaves was studied by analysis of three-dimensional immunofluorescent images. It was found that while guard cell microtubules in the epidermis of leaves incubated in the light were organized in parallel, straight and dense bundles, in the dark they were less straight and oriented randomly near the stomatal pore. The effect of blue and red light on the organization of guard cell microtubules resembled the effects of white light and dark respectively. When stomata were induced to open in the dark with fusicoccin, microtubules remained in the dark configuration. Furthermore, when incubated in the light, guard cell microtubules were more resistant to oryzalin. Similarly, microtubules of Arabidopsis guard cells, expressing green fluorescent protein-tubulin α 6, were disorganized in the dark, but were organized in parallel arrays in the presence of white light. The dynamics of microtubule rearrangement upon transfer of intact leaves from dark to light was followed in single stomata, showing that an arrangement of microtubules typical for light conditions was obtained after 1 h in the light. Our data suggest that microtubule organization in guard cells is responsive to light signals.
Scientific Publication
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