Rapid Shedding of Roots from Azolla filiculoides Plants in Response to Inhibitors of Respiration : ENVIRONMENTAL AND STRESS RESPONSES : STRUCTURE AND FUNCTION OF CELLS :

• Uheda,Eiji

  Research Institute for Advanced Science and Technology, University of Osaka Prefecture

• Kitoh,Shunji

  Research Institute for Advanced Science and Technology, University of Osaka Prefecture

抄録

Chemicals that are known to be inhibitors of respiration, namely, sodium azide, sodium cyanide, DNP, CCCP and DCCD, caused shedding of roots of Azolla filiculoides plants. Complete shedding of roots of more than 10 mm in length occurred when Azolla plants were treated with sodium azide, DNP or CCCP at concentrations above 50 μM, 30 μM and 20 μM, respectively. The shedding in response to sodium azide, DNP and CCCP was very rapid and was complete within 5-20 min. Microscopic studies revealed the presence of large cells at the outer surface of the base of roots that were about to be shed. The tested chemicals caused the expansion, rounding up and separation of these cells, probably via the rapid absorption of water, with resultant shedding of roots. When detached roots were immersed in a solution of sodium azide, DNP or CCCP, the large cells expanded and rounded up. These cells were gradually separated from the roots. However, the separation of the cells caused by DNP was inhibited by the presence of various buffers at acidic pH. By contrast, buffers at neutral pH greatly facilitated the separation of cells irrespective of whether DNP was present or absent. The results suggest that the separation of cells involves an increase in the pH of the external solution in the vicinity of the large cells. A change in ion fluxes of the large cells, which accompanies an increase in pH of the external solution, may cause the rapid absorption of water by the cells and result in the expansion and separation of the cells.

収録刊行物

• Plant and cell physiology

  Plant and cell physiology 35 (1), 37-43,

  Japanese Society of Plant Physiologists

キーワード

• Abscission
• Azolla filiculoides
• Detached roots
• Expansion and separation of cells
• Inhibitors of respiration
• Rapid shedding
• Root

詳細情報

• CRID: 1543950420081140224
• NII論文ID: 110003720406
• NII書誌ID: AA0077511X
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10771301
• 本文言語コード: en
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