期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 68, 期 8, 页码 1905-1918出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erw387
关键词
Actinorhizal plants; intercellular invasion; legumes; molecular signaling; rhizobia; symbioses
资金
- Secretaria de Ciencia y Tecnica de la Universidad Nacional de Rio Cuarto (Argentina)
- Fundacion Mani Argentino (Argentina)
- CONICET (Argentina)
- ANPCyT (Argentina)
- CONICET, Argentina [PIP 112-201101-00031]
- Universidad Nacional de Quilmes, Argentina [PUNQ 1009/11]
Agricultural practices contribute to climate change by releasing greenhouse gases such as nitrous oxide that are mainly derived from nitrogen fertilizers. Therefore, understanding biological nitrogen fixation in farming systems is beneficial to agriculture and environmental preservation. In this context, a better grasp of nitrogen-fixing systems and nitrogen-fixing bacteria-plant associations will contribute to the optimization of these biological processes. Legumes and actinorhizal plants can engage in a symbiotic interaction with nitrogen-fixing rhizobia or actinomycetes, resulting in the formation of specialized root nodules. The legume-rhizobia interaction is mediated by a complex molecular signal exchange, where recognition of different bacterial determinants activates the nodulation program in the plant. To invade plants roots, bacteria follow different routes, which are determined by the host plant. Entrance via root hairs is probably the best understood. Alternatively, entry via intercellular invasion has been observed in many legumes. Although there are common features shared by intercellular infection mechanisms, differences are observed in the site of root invasion and bacterial spread on the cortex reaching and infecting a susceptible cell to form a nodule. This review focuses on intercellular bacterial invasion of roots observed in the Fabaceae and considers, within an evolutionary context, the different variants, distribution and molecular determinants involved. Intercellular invasion of actinorhizal plants and Parasponia is also discussed.
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