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Molecular characterization of a mutation affecting abscisic acid biosynthesis and consequently stomatal responses to humidity in an agriculturally important species.

McAdam SA, Sussmilch FC, Brodribb TJ, Ross JJ - AoB Plants (2015)

Bottom Line: To date, this step has only been represented by mutants in the ABA2 gene of Arabidopsis thaliana.Phylogenetic analysis of the ABA2 gene family from diverse land plants indicates that an ABA-biosynthesis-specific short-chain dehydrogenase (ABA2) evolved in the earliest angiosperms.The relatively recent origin of specificity in this step has important implications for both the evolution of ABA biosynthesis and action in land plants.

View Article: PubMed Central - PubMed

Affiliation: School of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, TAS 7005, Australia smcadam@utas.edu.au.

No MeSH data available.


The biosynthetic pathway for ABA from the carotenoid, ╬▓-carotene; known enzymes and characterized mutants of these enzymes at each step are indicated.
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PLV091F1: The biosynthetic pathway for ABA from the carotenoid, ╬▓-carotene; known enzymes and characterized mutants of these enzymes at each step are indicated.

Mentions: The phytohormone abscisic acid (ABA) is critical for land plant survival and is implicated in plant responses to water deficit. One of the earliest identified roles for ABA is closing the stomata of angiosperms (Mittelheuser and Van Steveninck 1969; Jones and Mansfield 1970). The signalling pathway for ABA-induced stomatal closure has been the subject of detailed investigation in recent years, through the use of single gene mutants, and is reasonably well understood (Geiger et al. 2011). Likewise, mutants deficient in ABA levels have been instrumental in revealing the pathway by which ABA is synthesized in plants (Nambara and Marion-Poll 2005; Taylor et al. 2005). The molecular characterization of mutants from diverse angiosperm species has provided strong evidence for the widely accepted, linear biosynthetic pathway for this hormone (Fig. 1).Figure 1.


Molecular characterization of a mutation affecting abscisic acid biosynthesis and consequently stomatal responses to humidity in an agriculturally important species.

McAdam SA, Sussmilch FC, Brodribb TJ, Ross JJ - AoB Plants (2015)

The biosynthetic pathway for ABA from the carotenoid, ╬▓-carotene; known enzymes and characterized mutants of these enzymes at each step are indicated.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4583606&req=5

PLV091F1: The biosynthetic pathway for ABA from the carotenoid, ╬▓-carotene; known enzymes and characterized mutants of these enzymes at each step are indicated.
Mentions: The phytohormone abscisic acid (ABA) is critical for land plant survival and is implicated in plant responses to water deficit. One of the earliest identified roles for ABA is closing the stomata of angiosperms (Mittelheuser and Van Steveninck 1969; Jones and Mansfield 1970). The signalling pathway for ABA-induced stomatal closure has been the subject of detailed investigation in recent years, through the use of single gene mutants, and is reasonably well understood (Geiger et al. 2011). Likewise, mutants deficient in ABA levels have been instrumental in revealing the pathway by which ABA is synthesized in plants (Nambara and Marion-Poll 2005; Taylor et al. 2005). The molecular characterization of mutants from diverse angiosperm species has provided strong evidence for the widely accepted, linear biosynthetic pathway for this hormone (Fig. 1).Figure 1.

Bottom Line: To date, this step has only been represented by mutants in the ABA2 gene of Arabidopsis thaliana.Phylogenetic analysis of the ABA2 gene family from diverse land plants indicates that an ABA-biosynthesis-specific short-chain dehydrogenase (ABA2) evolved in the earliest angiosperms.The relatively recent origin of specificity in this step has important implications for both the evolution of ABA biosynthesis and action in land plants.

View Article: PubMed Central - PubMed

Affiliation: School of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, TAS 7005, Australia smcadam@utas.edu.au.

No MeSH data available.