IAA and ZR content in leek (Allium porrum L.), as influenced by P nutrition and arbuscular mycorrhizae, in relation to plant development

Torelli, Anna; Trotta, Antonio; Acerbi, L.; Arcidiacono, G.; Berta, Graziella; Branca, C.

doi:10.1007/978-94-017-2858-4_7

Cited by 43 publications

(53 citation statements)

References 29 publications

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“…An increase of ABA level has been reported earlier in 554 maize (Danneberg et al, 1992) and soybean (Meixner et al, 2005). Likewise, an increase of IAA in AM onion (Torelli et al, 2000), AM litchi (Yao et al, 2005) and AM soybean (Meixner et al, 2005) was also well documented. In AM barley and cucumber, considerably higher JA levels had been observed, compared to non-AM controls (Hause et al, 2002;Vierheilig and Piche, 2002).…”

Section: Discussionsupporting

confidence: 68%

Exogenous Phytohormones Modulate Mycorrhiza-Induced Changes in Root Hair Configuration of Trifoliate Orange

Liu¹,

Srivastava²,

Zhang³

et al. 2016

Not Bot Horti Agrobo

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The study was carried out in a two-chambered rootbox separated by 37-μm nylon mesh to establish root+hyphae chamber carrying trifoliate orange (Poncirus trifoliata) as the test plant inoculated with Diversispora versiformis and hyphae chamber (without roots). This objective is to evaluate whether exogenous phytohormones regulate mycorrhizal effects on root hairs. Indole butyric acid (IBA), abscisic acid (ABA), and jasmonic acid (JA) (each at 0.1 μM concentration) were weekly applied into hyphae chamber, in total of six times before plant harvest. Mycorrhization strongly stimulated plant growth performance, and exogenous phytohormones, especially IBA, further magnified the mycorrhizal-stimulated growth response. Three exogenous phytohormones significantly decreased mycorrhizal colonization in taproot and first-order lateral roots, but increased in second-and third-order lateral roots, compared with non-phytohormone treatment in mycorrhozal plants. These phytohormones also increased hyphal length in nylon mesh and soil, irrespective of root+hyphae or hyphae chamber. Mycorrhizal inoculation significantly increased root hair density in different root classes, and exogenous hormones further strengthened the mycorrhizal effect. Average root hair length was stimulated by mycorrhization, but all exogenous phytohormones weakened the mycorrhizal response. Mycorrhization in combination with exogenous phytohormones showed no response on root hair diameter. Hence, the result suggested that application of exogenous phytohormones in hyphae chamber strengthened the D. versiformis-induced change in root hair density but weakened in root hair length in trifoliate orange grown in root+hyphae chamber.

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Section: Discussionsupporting

confidence: 68%

Exogenous Phytohormones Modulate Mycorrhiza-Induced Changes in Root Hair Configuration of Trifoliate Orange

Liu¹,

Srivastava²,

Zhang³

et al. 2016

Not Bot Horti Agrobo

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“…Uma vez que as plantas inoculadas apresentaram uma concentração 2 a 5 vezes maior de auxina nas raízes do que as plantas não-inoculadas, foi sugerido que a mudança na morfologia de raízes é decorrente das mudanças nos teores desse FH. Adicionalmente, o aumento na concentração de auxinas nas raízes pode estar associado à formação de células poliploides e diferenciação de arbúsculos (Torelli et al, 2000), já que há alta correlação entre poliploidia e presença de arbúsculos em células corticais (Tahiri-Alaoui et al, 2002). No entanto, as alterações das concentrações de auxinas e outros FHs devem ser examinadas nas vizinhanças das células colonizadas pelos FMAs, pois efeitos localizados podem ser mais importantes para o controle da interação planta-FMA do que efeitos sistêmicos.…”

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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“…7 However, no changes in IAA levels were observed in leek and tomato. 10,11 Auxins, in particular IBA, may facilitate the colonization of a host by increasing the number of lateral roots as preferential colonization sites for the fungi during early growth phases. 5 In accordance with this hypothesis the most active mycelium, characterized by fungal enzyme activities, was found in newly formed lateral roots.…”

Section: Introductionmentioning

confidence: 99%

Auxins as Signals in Arbuscular Mycorrhiza Formation

Ludwig‐Müller

Güther

2007

Plant Signaling & Behavior

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Plant hormones such as auxin derivatives are likely signals during the establishment of an arbuscular mycorrhizal (AM) symbiosis. Although reports on auxin levels during AM in different plant species are contradictory, the contribution of auxins to the establishment of an AM symbiosis might be an important factor especially for the development of lateral roots which are the preferred infection sites for the fungi. In addition to evidence that different auxins could be elevated after colonization with AM fungi, there are also overlapping gene expression patterns between auxin-treated and AM-inoculated roots that provide further clues on auxin-triggered colonization events. Using an auxin-inducible promoter-reporter system it was shown that the reporter was strongly induced in AM colonized roots, although co-localization with AM fungi was not observed. Our data are discussed in frame of a model together with other plant hormones which might be involved in the AM colonization processes.

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IAA and ZR content in leek (Allium porrum L.), as influenced by P nutrition and arbuscular mycorrhizae, in relation to plant development

Cited by 43 publications

References 29 publications

Exogenous Phytohormones Modulate Mycorrhiza-Induced Changes in Root Hair Configuration of Trifoliate Orange

Exogenous Phytohormones Modulate Mycorrhiza-Induced Changes in Root Hair Configuration of Trifoliate Orange

Regulação do desenvolvimento de micorrizas arbusculares

Auxins as Signals in Arbuscular Mycorrhiza Formation

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