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Review
. 2003 Sep;133(1):29-36.
doi: 10.1104/pp.103.025395.

Regulation of abscisic acid biosynthesis

Liming Xiong  1 , Jian-Kang Zhu
Affiliations
Review

Regulation of abscisic acid biosynthesis

Liming Xiong et al. Plant Physiol. 2003 Sep.
No abstract available

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Figures

Figure 1.
Figure 1.
Regulation of ABA biosynthesis. ABA is derived from C40 epoxycarotenoid precursors through an oxidative cleavage reaction in plastids. The C15 intermediate xanthoxin is converted to ABA by a two-step reaction via ABA-aldehyde in cytosol. Abiotic stresses such as drought and salt activate the biosynthetic genes (italicized), probably through a Ca2+-dependent phosphorelay cascade as shown on the left. ABA feedback stimulates the expression of the biosynthetic genes, which is also likely through a Ca2+-dependent phosphoprotein cascade. Among the biosynthetic genes, NCED is strongly upregulated by stress (indicated with a thick arrow), whereas SDR is regulated by sugar. ABA biosynthetic enzymes are shown in small ovals. The NCED step probably limits ABA biosynthesis in leaves (indicated with a dashed arrow). ZEP, zeaxanthin epoxidase; NCED, 9-cis-epoxycarotenoid dioxygenase; AAO, ABA-aldehyde oxidase; MCSU, MoCo sulfurase.
See this image and copyright information in PMC

References

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