http://www.cnr.it/ontology/cnr/individuo/prodotto/ID26562
Differential Effects of Combined N Sources on Early Steps of the Nod Factor-Dependent Transduction Pathway in Lotus japonicus (Articolo in rivista)
- Type
- Label
- Differential Effects of Combined N Sources on Early Steps of the Nod Factor-Dependent Transduction Pathway in Lotus japonicus (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1094/MPMI-20-8-0994 (literal)
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- Barbulova A.; Rogato A.; D'Apuzzo E.; Omrane S.; Chiurazzi M. (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Institute of Genetics and Biophysics A, Buzzati Traverso, Via P. Castellino 111, 80131, Napoli, Italy (literal)
- Titolo
- Differential Effects of Combined N Sources on Early Steps of the Nod Factor-Dependent Transduction Pathway in Lotus japonicus (literal)
- Abstract
- The development of nitrogen-fixing nodules in legumes is induced by perception of lipochitin-oligosaccharide signals secreted by a bacterial symbiont. Nitrogen (N) starvation is a prerequisite for the formation, development, and function of root nodules, and high levels of combined N in the form of nitrate or ammonium can completely abolish nodule formation. We distinguished between nitrate and ammonium inhibitory effects by identifying when and where these combined N sources interfere with the Nod-factor-induced pathway. Furthermore, we present a small-scale analysis of the expression profile, under different N conditions, of recently identified genes involved in the Nod-factor-induced pathway. In the presence of high levels of nitrate or ammonium, the NIN gene fails to be induced 24 h after the addition of Nod factor compared with plants grown under N-free conditions. This induction is restored in the hypernodulating nitrate-tolerant har1-3 mutant only in the presence of 10 and 20 mM KNO3. These results were confirmed in Lotus plants inoculated with Mesorhizobium loti. NIN plays a key role in the nodule organogenesis program and its downregulation may represent a crucial event in the nitrate-dependent pathway leading to the inhibition of nodule organogenesis. (literal)
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