Reduced arbuscular mycorrhizal colonization in tomato ethylene mutants

Scientia Agricola

Agustin Zsögön²  Marcio Rodrigues Lambais¹  Vagner Augusto Benedito¹  Antonio Vargas De Oliveira Figueira¹  Lázaro Eustáquio Pereira Peres² 

[1] ,USP ESALQ Piracicaba SP ,Brasil

关键词: Lycopersicon;    Micro-Tom;    defense-related genes;    hormones;    phosphate;    Lycopersicon;    Micro-Tom;    genes relacionados à defesa;    fosfato;    hormônios;   

DOI  :  10.1590/S0103-90162008000300006

来源: SciELO

【 摘 要 】

Plant hormones are likely key regulators of arbuscular mycorrhizae (AM) development. However, their roles in AM are not well known. Here mutants in five hormone classes introgressed in a single tomato (Lycopersicon esculentum Mill. Syn Solanum lycopersicum L.) background (cv. Micro-Tom) were used to determine their effects on AM development and the expression of defense-related genes (chitinases and b-1,3-glucanases) in roots. Under low P conditions, mutant epinastic (epi) and Never ripe (Nr), ethylene overproducer and low sensitivity, respectively, had the intraradical colonization by Glomus clarum highly inhibited, as compared to the control Micro-Tom (MT). No significant alterations in fungal colonization were observed in mutants affecting other hormone classes. Under low P conditions, the steady state levels of transcripts encoding a class I basic chitinase (chi9) were higher in mycorrhizal epi and Nr mutant roots as compared to MT controls. In contrast the steady state levels of a class III acidic b-1,3-glucanase (TomPR-Q'a) transcripts in mycorrhizal epi mutant roots were significantly lower than in mycorrhizal MT roots. Root colonization in epi mutants was accompanied by several alterations in fungal morphology, as compared to root colonization in MT controls. The data suggest that ethylene may play an important role in controlling intraradical arbuscular mycorrhizal fungal growth.

【 授权许可】

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