ABA plays a central role in mediating the regulatory effects of nitrate on root branching in Arabidopsis

A - Papers appearing in refereed journals

Signora, L., De Smet, I., Foyer, C. H. and Zhang, H. 2001. ABA plays a central role in mediating the regulatory effects of nitrate on root branching in Arabidopsis. The Plant Journal. 28 (6), pp. 655-662.

AuthorsSignora, L., De Smet, I., Foyer, C. H. and Zhang, H.
Abstract

The formation of lateral roots (LR) is a major post-embryonic developmental event in plants. In Arabidopsis thaliana, LR development is inhibited by high concentrations of NO3-. Here we present strong evidence that ABA plays an important role in mediating the effects of NO3- on LR formation. Firstly, the inhibitory effect of NO3- is significantly reduced in three ABA,insensitive mutants, abi4-1, abi4-2 and abi5-1, but not in abi1-1, abi2-1 and abi3-1. Secondly, inhibition by NO3- is significantly reduced, but not completely abolished, in four ABA synthesis mutants, aba1-1, aba2-3, aba2-4 and aba3-2. These results indicate that there are two regulatory pathways mediating the inhibitory effects of NO3- in A. thaliana roots. One pathway is ABA-dependent and involves ABI4 and ABI5, whereas the second pathway is ABA-independent. In addition, ABA also, plays a role in mediating the stimulation of LR elongation by local NO3- applications.

KeywordsPlant Sciences
Year of Publication2001
JournalThe Plant Journal
Journal citation28 (6), pp. 655-662
Digital Object Identifier (DOI)doi:10.1046/j.1365-313x.2001.01185.x
PubMed ID11851911
Open accessPublished as non-open access
Funder project or code413
521
Project: 014149
ISSN09607412
0960-7412
PublisherWiley

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