Effect of root colonization by arbuscular mycorrhizal fungi on growth, productivity and blast resistance in rice
Campo, Sonia (Centre de Recerca en Agrigenòmica)
Martín Cardoso, Héctor (Centre de Recerca en Agrigenòmica)
Olivé, Marta (Centre de Recerca en Agrigenòmica)
Pla, Eva (Institut de Recerca i Tecnologia Agroalimentàries. Camps de conreus)
Catala Forner, Mar (Institut de Recerca i Tecnologia Agroalimentàries. Camps de conreus)
Martínez Eixarch, Maite (Institut de Recerca i Tecnologia Agroalimentàries. Aigües marines i continentals)
San Segundo, Blanca (Centre de Recerca en Agrigenòmica)

Data:	2020
Resum:	Background: Arbuscular mycorrhizal (AM) fungi form symbiotic associations with roots in most land plants. AM symbiosis provides benefits to host plants by improving nutrition and fitness. AM symbiosis has also beenassociated with increased resistance to pathogen infection in several plant species. In rice, the effects of AM symbiosis is less studied, probably because rice is mostly cultivated in wetland areas, and plants in such ecosystems have traditionally been considered as non-mycorrhizal. In this study, we investigated the effect of AM inoculation on performance of elite rice cultivars (Oryza sativa, japonica subspecies) under greenhouse and field conditions, focusing on growth, resistance to the rice blast fungus Magnaporthe oryzae and productivity. Results: The response to inoculation with either Funneliformis mosseae or Rhizophagus irregularis was evaluated in a panel of 12 rice cultivars. Root colonization was confirmed in all rice varieties. Under controlled greenhouse conditions, R. irregularis showed higher levels of root colonization than F. mosseae. Compared to non-inoculated plants, the AM-inoculated plants had higher Pi content in leaves. Varietal differences were observed in the growth response of rice cultivars to inoculation with an AM fungus, which were also dependent on the identity of the fungus. Thus, positive, negligible, and negative responses to AM inoculation were observed among rice varieties. Inoculation with F. mosseae or R. irregularis also conferred protection to the rice blast fungus, but the level of mycorrhiza-induced blast resistance varied among host genotypes. Rice seedlings (Loto and Gines varieties) were pre-inoculated with R. irregularis, transplanted into flooded fields, and grown until maturity. A significant increase in grain yield was observed in mycorrhizal plants compared with non-mycorrhizal plants, which was related to an increase in the number of panicles. Conclusion: Results here presented support that rice plants benefit from the AM symbiosis while illustrating the potential of using AM fungi to improve productivity and blast resistance in cultivated rice. Differences observed in the mycorrhizal responsiveness among the different rice cultivars in terms of growth promotion and blast resistance indicate that evaluation of benefits received by the AM symbiosis needs to be carefully evaluated on a case-by-case basis for efficient exploitation of AM fungi in rice cultivation.
Ajuts:	European Commission 618105 Ministerio de Ciencia e Innovación RTI2018-101275-B-I00 Ministerio de Economía y Competitividad SEV-2015-0533
Nota:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Arbuscular mycorrhiza ; Funneliformis mosseae ; Japonica ; Magnaporthe oryzae ; Resistance ; Rhizophagus irregularis ; Rice ; Symbiosis ; Yield
Publicat a:	Rice, Vol. 13 (June 2020) , art. 42, ISSN 1939-8433

DOI: 10.1186/s12284-020-00402-7
PMID: 32572623

14 p, 1.6 MB

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