Download Annual Plant Reviews, Plant Hormone Signaling (Volume 24) by Peter Hedden, Stephen G. Thomas PDF

By Peter Hedden, Stephen G. Thomas

Plant development is regulated through developmental programmes that may be transformed via environmental cues appearing via endogenous signaling molecules together with plant hormones.

This quantity offers an outline of the biosynthesis, catabolism, belief and sign transduction of the person hormone periods, via chapters on hormone distribution and delivery, and the jobs of hormone signaling in particular developmental tactics. specific awareness is paid to the legislation of hormone signaling by means of environmental and developmental cues, websites of hormone metabolism and motion, and interactions among hormone signaling pathways. The publication is directed at researchers and execs in plant biochemistry and molecular biology.

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3b). , 1996). The CE1 motif, at least in maize, has been shown to be a target of the ERF/AP2-type transcription factor ABI4 (Fig. 3b) (Niu & Bate, 2002). ZmABI4 is probably the ortholog of ABI4 in Arabidopsis, as the former complements the abi4 mutant. , 2002). Important motifs for its proper regulation by ABA and drought are recognized by the MYC helix–loop–helix (CACATG) and MYB (TGGTTAG) classes of transcription factors. , 2003; Yamaguchi-Shinozaki & Shinozaki, 2005). , 1997) have produced a wealth of mutants affected in ABA responses.

Recent evidence showed that ABA suppresses the hydrolytic activity of the Hϩ-ATPase, most likely by decreasing the phosphorylation of this proton pump, which in turn would have lower affinity for the binding of 14-3-3 proteins (Zhang, X. , 2004). There is no firm idea concerning the types of kinases and protein phosphatases that ensure the correct balance of the Hϩ-ATPase activity. , 2004), which are expressed in guard cells, might also be interesting to explore as potential regulators of light–ABA cross-talk.

The increase in ABA levels in response to stress is achieved in part by its higher synthesis relative to its degradation rate. , 2004) but the level is still lower than that for NCED3. Upon rehydration the relative levels of the two transcripts are reversed with a notable increase in PA. The sites of ABA synthesis under water stress conditions are controversial. It is thought to be synthesized in the roots when soil dries and subsequently translocated to the shoot for regulation of transpiration (Wilkinson & Davies, 2002).

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