Effects of jasmonic acid on mycorrhizal <i>Allium sativum</i>

Regvar, Marjana; Gogala, N.; Zalar, Polona

doi:10.1111/j.1469-8137.1996.tb04936.x

Cited by 54 publications

(29 citation statements)

References 17 publications

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“…However, in symbiotic interactions, putative signals, including jasmonates, are poorly understood. To date, only a few hints for a possible involvement of JA in mycorrhization have been shown: Treatment with JA stimulated the mycorrhizal development of an ectomycorrhiza (Regvar et al, 1996(Regvar et al, , 1997, and accumulation of secondary compounds occurring in AM barley roots is inducible in nonmycorrhizal roots by jasmonates (Peipp et al, 1997). Here, we analyzed the involvement of jasmonates in the formation of an AM symbiosis established by colonization of barley roots with G. intraradices.…”

Section: Discussionmentioning

confidence: 99%

Induction of Jasmonate Biosynthesis in Arbuscular Mycorrhizal Barley Roots,

Hause¹,

Maier²,

et al. 2002

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Colonization of barley (Hordeum vulgare cv Salome) roots by an arbuscular mycorrhizal fungus, Glomus intraradices Schenck & Smith, leads to elevated levels of endogenous jasmonic acid (JA) and its amino acid conjugate JA-isoleucine, whereas the level of the JA precursor, oxophytodienoic acid, remains constant. The rise in jasmonates is accompanied by the expression of genes coding for an enzyme of JA biosynthesis (allene oxide synthase) and of a jasmonate-induced protein (JIP23). In situ hybridization and immunocytochemical analysis revealed that expression of these genes occurred cell specifically within arbuscule-containing root cortex cells. The concomitant gene expression indicates that jasmonates are generated and act within arbuscule-containing cells. By use of a near-synchronous mycorrhization, analysis of temporal expression patterns showed the occurrence of transcript accumulation 4 to 6 d after the appearance of the first arbuscules. This suggests that the endogenous rise in jasmonates might be related to the fully established symbiosis rather than to the recognition of interacting partners or to the onset of interaction. Because the plant supplies the fungus with carbohydrates, a model is proposed in which the induction of JA biosynthesis in colonized roots is linked to the stronger sink function of mycorrhizal roots compared with nonmycorrhizal roots.

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Section: Discussionmentioning

confidence: 99%

Induction of Jasmonate Biosynthesis in Arbuscular Mycorrhizal Barley Roots,

Hause¹,

Maier²,

et al. 2002

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“…Da mesma forma, foi observado que a aplicação exógena de AJ promove a colonização intrarradicular e aumenta o desenvolvimento de arbúsculos e vesículas em raízes de Allium sativum colonizadas por Glomus spp. (Regvar et al, 1996). Por outro lado, a supressão da expressão do gene MtAOC, que codifica uma oxidoalenociclase (AOC) envolvida na biossíntese do AJ, em raízes de M. truncatula, resulta na redução dos teores de AJ e na formação de MAs por G. intraradices (Isayenkov et al, 2005).…”

Section: Regulação Por Fitormôniosunclassified

Regulação do desenvolvimento de micorrizas arbusculares

Kiriachek¹,

Azevedo²,

Peres³

et al. 2009

Rev. Bras. Ciênc. Solo

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RESUMOAs micorrizas arbusculares (MAs) são associações simbióticas mutualistas entre fungos do filo Glomeromycota e a maioria das plantas terrestres. A formação e o funcionamento das MAs depende de um complexo processo de troca de sinais, que resulta em mudanças no metabolismo dos simbiontes e na diferenciação de uma interface simbiótica no interior das células das raízes. Os mecanismos que regulam a formação das MAs são pouco conhecidos, mas sabe-se que a concentração de fosfato (P) na planta é um fator determinante para o desenvolvimento da simbiose. A disponibilidade de P na planta pode afetar o balanço de açúcares e de fitormônios (FHs), além da expressão de genes de defesa vegetal. Com o advento da genômica e proteômica, vários genes essenciais para o desenvolvimento das MAs já foram identificados e seus mecanismos de regulação estão sendo estudados. Até o presente, sabe-se que as plantas secretam substâncias que estimulam a germinação de esporos e o crescimento de fungos micorrízicos arbusculares (FMAs). Há evidências também de que os FMAs sintetizam moléculas sinalizadoras, que são reconhecidas pelas plantas hospedeiras. Pelo menos três genes são essenciais para o reconhecimento dessa molécula e a transdução do sinal molecular. Discutem-se os papéis desses genes e os possíveis mecanismos que regulam sua expressão, bem como os papéis dos FHs na regulação de MAs são discutidos.Termos de indexação: micorriza arbuscular, sinalização, fitormônios, genes de defesa, fosfato.(1) Recebido para publicação em junho de 2008 e aprovado em novembro de 2008.

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“…Still, the regulatory role of JAs and other oxylipins on the symbiosis is far from clear. Studies involving foliar application of JA and wounding have resulted in promotion of mycorrhizal root colonization (Landgraf et al 2012;Regvar et al 1996), while the use of JA-impaired mutants in different plant species has resulted in both promotion (Herrera-Medina et al 2008;Ludwig-Müller et al 2002) and reduction (Isayenkov et al 2005) of mycorrhizal colonization, supporting a multifunctional role on the symbiosis. In summary, current data on defense-related phytohormone homeostasis in AM roots are often fragmented and highly contradictory, opening the hypothesis that the changes in mycorrhizal roots are dependent on the plant and the AMF genotype.…”

Section: Introductionmentioning

confidence: 99%

Defense Related Phytohormones Regulation in Arbuscular Mycorrhizal Symbioses Depends on the Partner Genotypes

et al. 2014

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Arbuscular mycorrhizal (AM) symbioses are mutualistic associations between soil fungi and most vascular plants. Modulation of the hormonal and transcriptional profiles, including changes related to defense signalling, has been reported in many host plants during AM symbioses. These changes have been often related to the improved stress tolerance common in mycorrhizal plants. However, results on the alterations in phytohormones content and their role on the symbiosis are controversial.Here, an integrative analysis of the response of phylogenetically diverse plants (i.e., tomato, soybean, and maize) to two mycorrhizal fungi -Funneliformis mosseae and Rhizophagus irregularis-was performed. The analysis of the defense-related hormones salicylic acid, abscisic acid, and jasmonates, and the expression of marker genes of the pathways they regulate, revealed significant changes in the roots of mycorrhizal plants. These changes depended on both the plant and the AM fungus (AMF) involved. However, general trends can be identified: roots associated with the most effective colonizer R. irregularis showed fewer changes in these defense-related traits, while the colonization by F. mosseae led to significant modifications in all plants tested. The up-regulation of the jasmonate pathway by F. mosseae was found to be highly conserved among the different plant species, suggesting an important role of jasmonates during this AM interaction. Our study evidences a strong influence of the AMF genotype on the modulation of host defense signalling, and offers hints on the role of these changes in the symbiosis.

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Effects of jasmonic acid on mycorrhizal Allium sativum

Cited by 54 publications

References 17 publications

Induction of Jasmonate Biosynthesis in Arbuscular Mycorrhizal Barley Roots,

Induction of Jasmonate Biosynthesis in Arbuscular Mycorrhizal Barley Roots,

Regulação do desenvolvimento de micorrizas arbusculares

Defense Related Phytohormones Regulation in Arbuscular Mycorrhizal Symbioses Depends on the Partner Genotypes

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