Meloidogyne-SP4 effector gene silencing reduces reproduction of root-knot nematodes in rice (Oryza sativa) - ANR - Agence nationale de la recherche Accéder directement au contenu
Article Dans Une Revue Nematology Année : 2022

Meloidogyne-SP4 effector gene silencing reduces reproduction of root-knot nematodes in rice (Oryza sativa)

Résumé

The root-knot nematodes (RKN) Meloidogyne graminicola and M. incognita are responsible for rice yield losses worldwide, particularly in Asia and Africa. Previous studies demonstrated that nematode-secreted proteins are crucial for root invasion and establishment in the host. We present some characteristics of a pioneer effector, M. incognita- secreted protein 4 (Mi-SP4), which is conserved in RKN and required for infection in compatible rice-RKN interactions. In situ hybridisation assays revealed Mi-SP4 expression in the dorsal pharyngeal gland of M. incognita second-stage juveniles (J2). Meloidogyne - SP4 transcripts strongly accumulated in pre-parasitic J2 and decreased in later parasitic stages of M. incognita and M. graminicola . Transient expression of the nematode effector gene in Nicotiana benthamiana leaves and onion cells indicated that GFP-tagged Mi-SP4 was present in the cytoplasm and accumulated in the nucleus of the plant cells. In vitro RNA interference (RNAi) gene silencing, obtained by soaking J2 with small-interfering (si)RNA si4-1, decreased Mi - SP4 expression in J2 by 35% and significantly reduced M. incognita reproduction in rice by at least 30%. Similarly, host-mediated gene silencing of the nematode SP4 effector candidate gene in transgenic rice plants significantly reduced M. graminicola reproduction by 26% to 47%. The data obtained demonstrate that Mi -SP4 is a pioneer virulence effector, which plays an essential role in both M. incognita and M. graminicola pathogenicity on rice.
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Dates et versions

hal-03792369 , version 1 (30-09-2022)

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Phong V Nguyên, Thanh Lt. Biện, Linh B Tôn, Ðôn Ð. Lê, M. Kathryn Wright, et al.. Meloidogyne-SP4 effector gene silencing reduces reproduction of root-knot nematodes in rice (Oryza sativa). Nematology, 2022, 24 (5), pp.571-588. ⟨10.1163/15685411-bja10152⟩. ⟨hal-03792369⟩
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