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Abscisic‐acid‐deficient mutants at the aba gene locus of Arabidopsis thaliana are impaired in the epoxidation of zeaxanthin
Author(s) -
DUCKHAM S. C.,
LINFORTH R. S. T.,
TAYLOR I. B.
Publication year - 1991
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1991.tb01531.x
Subject(s) - neoxanthin , violaxanthin , abscisic acid , zeaxanthin , mutant , wild type , arabidopsis , xanthophyll , biology , arabidopsis thaliana , carotenoid , locus (genetics) , antheraxanthin , biochemistry , gene , lutein
. The xanthophyll content of wild type and abscisic acid (ABA) ‐ deficient mutants of pea and Arabidopsis thaliana was determined. The wilty mutant of pea was indistinguishable from the non‐mutant control. In contrast, plants homozygous for mutant alleles at the aba locus of Arabidopsis were very different from wild type. In these mutants, zeaxanthin accumulated to abnormally high levels. The major carotenoids, violaxanthin and 9′‐ cis ‐neoxanthin were virually absent from the mutant chromatograms. It was concluded that the aba genetic lesion impairs the epoxidation of zeaxanthin to violaxanthin and that this results in an inability to accumulate ABA. This provides clear evidence that zeaxanthin is a precursor of ABA.