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PLANT PHYSIOLOGY , Vol 105, Issue 4 1203-1208, Copyright © 1994 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Maternal Effects Govern Variable Dominance of Two Abscisic Acid Response Mutations in Arabidopsis thaliana
R. R. Finkelstein
Department of Biological Sciences, University of California, Santa Barbara, California 93106
Three abscisic acid (ABA)-controlled responses (seed dormancy, inhibition
of germination by applied ABA, and stomatal closure) were compared in
wild-type versus homo- and heterozygotes of two Arabidopsis thaliana
ABA-insensitive mutants, abi1 and abi2. We found that sensitivity of seeds
to applied ABA is partially maternally controlled but that seed dormancy is
determined by the embryonic genotype. The effects of the abi1 and abi2
mutations on ABA sensitivity of seed germination ranged from recessive to
nearly fully dominant, depending on the parental source of the mutant
allele. This maternal effect disappeared during vegetative growth. Stomatal
regulation in heterozygotes showed substantial variability, but the average
water loss was intermediate between that of homozygous mutants and wild
type.
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