Secondary messengers and phospholipase A2 in auxin signal transduction

被引:56
作者
Scherer, GFE [1 ]
机构
[1] Leibniz Univ Hannover, Inst Zierpflanzenbau Baumschule & Pflanzenzuchtun, Abt Spezielle Ertragsphysiol, D-30419 Hannover, Germany
关键词
auxin; fatty acid; phospholipase A(2); second messenger; signal transduction;
D O I
10.1023/A:1015290510483
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Despite recent progress auxin signal transduction remains largely scetchy and enigmatic. A good body of evidence supports the notion that the ABP1 could be a functional receptor or part of a receptor, respectively, but this is not generally accepted. Evidence for other functional receptors is lacking, as is any clearcut evidence for a function of G proteins. Protons may serve as second messengers in guard cells but the existing evidence for a role of calcium remains to be clearified. Phospholipases C and D seem not to have a function in auxin signal transduction whereas the indications for a role of phospholipase A(2) in auxin signal transduction accumulated recently. Mitogen-activated protein kinase (MAPK) is modulated by auxin and the protein kinase PINOID has a role in auxin transport modulation even though their functional linkage to other signalling molecules is ill-defined. It is hypothesized that signal transduction precedes activation of early genes such as IAA genes and that ubiquitination and the proteasome are a mechanism to integrate signal duration and signal strength in plants and act as major regulators of hormone sensitivity.
引用
收藏
页码:357 / 372
页数:16
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