Characterization of the ABA‐deficient tomato mutant notabilis and its relationship with maize Vp14

Characterization of the ABA‐deficient tomato mutant notabilis and its relationship with maize Vp14 Summary The notabilis ( not ) mutant of tomato has a wilty phenotype due to a deficiency in the levels of the plant hormone abscisic acid (ABA). The mutant appears to have a defect in a key control step in ABA biosynthesis – the oxidative cleavage of a 9‐ cis xanthophyll precursor to form the C15 intermediate, xanthoxin. A maize mutant, viviparous 14 ( vp14 ) was recently obtained by transposon mutagenesis. This maize genetic lesion also affects the oxidative cleavage step in ABA synthesis. Degenerate primers for PCR, based on the VP14 predicted amino acid sequence, have been used to provide probes for screening a wilt‐related tomato cDNA library. A full‐length cDNA clone was identified which is specific to the not gene locus. The ORFs of the tomato cDNA and maize Vp14 are very similar, apart from parts of their N‐terminal sequences. The not mutation has been characterized at the DNA level. A specific A/T base pair deletion of the coding sequence has resulted in a frameshift mutation, indicating that not is a null mutant. This observation is discussed in connection with the relatively mild phenotype exhibited by not mutant homozygotes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Characterization of the ABA‐deficient tomato mutant notabilis and its relationship with maize Vp14

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Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
D.O.I.
10.1046/j.1365-313X.1999.00386.x
Publisher site
See Article on Publisher Site

Abstract

Summary The notabilis ( not ) mutant of tomato has a wilty phenotype due to a deficiency in the levels of the plant hormone abscisic acid (ABA). The mutant appears to have a defect in a key control step in ABA biosynthesis – the oxidative cleavage of a 9‐ cis xanthophyll precursor to form the C15 intermediate, xanthoxin. A maize mutant, viviparous 14 ( vp14 ) was recently obtained by transposon mutagenesis. This maize genetic lesion also affects the oxidative cleavage step in ABA synthesis. Degenerate primers for PCR, based on the VP14 predicted amino acid sequence, have been used to provide probes for screening a wilt‐related tomato cDNA library. A full‐length cDNA clone was identified which is specific to the not gene locus. The ORFs of the tomato cDNA and maize Vp14 are very similar, apart from parts of their N‐terminal sequences. The not mutation has been characterized at the DNA level. A specific A/T base pair deletion of the coding sequence has resulted in a frameshift mutation, indicating that not is a null mutant. This observation is discussed in connection with the relatively mild phenotype exhibited by not mutant homozygotes.

Journal

The Plant JournalWiley

Published: Feb 1, 1999

References

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