Monoxenic nodulation process of Acacia mangium (Mimosoideae, Phyllodineae) by Bradyrhizobium sp

Perrineau Marie-Mathilde, Galiana Antoine, De Faria Sergio Miana, Béna Gilles, Duponnois Robin, Reddell Paul, Prin Yves. 2012. Monoxenic nodulation process of Acacia mangium (Mimosoideae, Phyllodineae) by Bradyrhizobium sp. Symbiosis, 56 (2) : 87-95.

https://doi.org/10.1007/s13199-012-0163-5

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Quartile : Q4, Sujet : MICROBIOLOGY

Résumé : Acacia mangium Willd., a native tree in Australia and Papua New Guinea, has been introduced to countries in Asia and South America where plantations have been established that cover several hundred thousand ha. The present study investigated the early stages of the nodulation process in A. mangium using an homologous Australian Bradyrhizobium strain. After optimizing the axenic nodulation, histological and cytological studies were conducted using light and electron microscopy. These documented the proliferation of Bradyrhizobium, the lysis of mucilage at the root surface, root hair deformation and initiation, as well as the development and growth of multiple infection threads. A belt of tanninfilled cells was shown to surround the central nodular fixation zone. The nodules were of the indeterminate type and the bacteroids had a rod shape, without size modification and with few polyhydroxybutyrate (PHB) granules. Several bacteroids can share the same symbiosome. A. mangium exhibits both classical and novel features in its nodulation.

Mots-clés Agrovoc : Acacia mangium, Bradyrhizobium, Fixation de l'azote, microscopie, système racinaire, nodosité racinaire, cytologie

Mots-clés géographiques Agrovoc : Australie

Classification Agris : F62 - Physiologie végétale - Croissance et développement
K10 - Production forestière

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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