Journal
PLANT GROWTH REGULATION
Volume 58, Issue 2, Pages 173-179Publisher
SPRINGER
DOI: 10.1007/s10725-009-9365-0
Keywords
Abscisic acid; Arachis hypogaea L.; Lateral roots; 9-cis-epoxycarotenoid dioxygenase (NCED)
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Funding
- Natural Science Fund of Guangdong Province in P. R. China [8151063101000011]
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ABA has been found to play a significant role in post-embryonic developmental in peanut seedlings. The results from the current study indicate that in the presence of exogenous 10 mu mol l(-1) ABA, lateral roots (LRs) number decreased and seedling development was delayed. This effect was eliminated by 25 mu mol l(-1) naproxen, an inhibitor of ABA biosynthesis. The Arabidopsis mutant deficient in ABA biosynthesis, nced3, displays a phenotype with more and longer LRs. We found that ABA decreased root-branching in peanut in a dose-dependent way. ABA-treated seedlings showed higher endogenous ABA levels than the control and naproxen-treated seedlings. RT-PCR results indicated that the expression of AhNCED1, a key gene in the ABA biosynthetic pathway, was significantly up-regulated by exogenous ABA in peanut. The mRNA levels of AhNCED1 began to increase 2 days after ABA treatment. The results from the current study show that ABA inhibits peanut LR development by increasing endogenous ABA contents.
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