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- W2009064863 abstract "Sodium azide caused the rapid abscission of branches only in the mature regions of Azolla filiculoides. The abscission started at or after 5 min of exposure to 0.5 mM sodium azide. The presence of ethylene at 70 ppm neither induced rapid abscission within 3 h nor influenced the rapid abscission of Azolla branches caused by sodium azide. Cycloheximide or actinomycin D had no inhibitory effect on the abscission that was caused by sodium azide. Light and electron microscopy revealed that large, flattened cells, present at the base of each branch, formed an abscission layer. Sequential observations of large flattened cells from the apical to the mature region of Azolla indicated that the middle lamella between the cells in the mature region had already been partially degraded, even when a branch was still attached to a plant. Sodium azide induced the rapid dissolution of the small amount of middle lamella that remained between the large, flattened cells in the mature region, as well as modification of the primary wall of these cells. These events appeared to weaken both the cell walls and the adhesion between the cells, causing cell expansion and rounding. The expansion and rounding of the large, flattened cells facilitated the complete separation of these cells and the subsequent separation of the branch. Possible mechanisms for the rapid abscission of Azolla branches upon treatment with sodium azide are discussed." @default.
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- W2009064863 date "1995-11-01" @default.
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- W2009064863 title "Aspects of the Very Rapid Abscission of Azolla Branches: Anatomy and Possible Mechanism" @default.
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- W2009064863 doi "https://doi.org/10.1086/297299" @default.
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