Role of the plasma membrane H+-ATPase in auxin-induced elongation growth:: historical and new aspects

被引:318
作者
Hager, A [1 ]
机构
[1] Univ Tubingen, Inst Bot, D-72076 Tubingen, Germany
关键词
acid-growth theory; auxin signalling cascade; cell-wall loosening; elongation growth; fusicoccin; H+-ATPase;
D O I
10.1007/s10265-003-0110-x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
This article will cover historical and recent aspects of reactions and mechanisms involved in the auxin-induced signalling cascade that terminates in the dramatic elongation growth of cells and plant organs. Massive evidence has accumulated that the final target of auxin action is the plasma membrane H+-ATPase, which excretes H+ ions into the cell wall compartment and, in an antiport, takes up K+ ions through an inwardly rectifying K+ channel. The auxin-enhanced H+ pumping lowers the cell wall pH, activates pH-sensitive enzymes and proteins within the wall, and initiates cell-wall loosening and extension growth. These processes, induced by auxin or by the "super-auxin" fusicoccin, can be blocked instantly and specifically by a voltage inhibition of the H+-ATPase due to removal of K+ ions or the addition of K+-channel blockers. Vice versa, H+ pumping and growth are immediately switched on by addition of K+ ions. Furthermore. the treatment of segments either with auxin or with fusicoccin (which activates the H+-ATPase irreversibly) or with acid buffers (from outside) causes an identical transformation and degradation pattern of cell wall constituents during cell-wall loosening and growth. These and other results described below are in agreement with the acid-growth theory of elongation growth. However, objections to this theory are also discussed.
引用
收藏
页码:483 / 505
页数:23
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