Auxins in the development of an arbuscular mycorrhizal symbiosis in maize

Fitze, Dorothee; Wiepning, Anne; Kaldorf, Michael; Ludwig‐Müller, Jutta

doi:10.1016/j.jplph.2005.01.014

Cited by 83 publications

(55 citation statements)

References 34 publications

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“…Targets for both miRNAs were confirmed independently by our degradome analysis and by Jagadeeswaran et al (2009). Auxin has been demonstrated to play a crucial role in AM symbiosis, probably in the presymbiotic phase of AM fungal development (Hanlon and Coenen, 2011), and the auxin content is elevated in mycorrhizal roots (Fitze et al, 2005;Jentschel et al, 2007). The fact that both miRNAs were significantly up-regulated in mycorrhizal roots and target transcripts of the same gene family implies that miR160c and miR167 might be involved in the fine regulation of auxin responses in AM symbiosis.…”

Section: Distinct Mirnas Are Up-regulated In Mycorrhizal Rootssupporting

confidence: 61%

Stars and Symbiosis: MicroRNA- and MicroRNA*-Mediated Transcript Cleavage Involved in Arbuscular Mycorrhizal Symbiosis

et al. 2011

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The majority of plants are able to form the arbuscular mycorrhizal (AM) symbiosis in association with AM fungi. During symbiosis development, plant cells undergo a complex reprogramming resulting in profound morphological and physiological changes. MicroRNAs (miRNAs) are important components of the regulatory network of plant cells. To unravel the impact of miRNAs and miRNA-mediated mRNA cleavage on root cell reprogramming during AM symbiosis, we carried out highthroughput (Illumina) sequencing of small RNAs and degradome tags of Medicago truncatula roots. This led to the annotation of 243 novel miRNAs. An increased accumulation of several novel and conserved miRNAs in mycorrhizal roots suggest a role of these miRNAs during AM symbiosis. The degradome analysis led to the identification of 185 root transcripts as mature miRNA and also miRNA*-mediated mRNA cleavage targets. Several of the identified miRNA targets are known to be involved in root symbioses. In summary, the increased accumulation of specific miRNAs and the miRNA-mediated cleavage of symbiosis-relevant genes indicate that miRNAs are an important part of the regulatory network leading to symbiosis development.Small silencing RNAs are a complex group of short RNAs with sizes in the range of approximately 20 to 25 nucleotides in length that can regulate gene expression at the transcriptional and posttranscriptional levels (Bartel, 2004;He and Hannon, 2004). In recent years, it has become evident that two main classes of small silencing RNAs, short interfering RNAs and microRNAs (miRNAs), are of great importance in plants. Small RNAs are involved in developmental processes, hormonal signaling, organ polarity, RNA metabolism, and abiotic and

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Section: Distinct Mirnas Are Up-regulated In Mycorrhizal Rootssupporting

confidence: 61%

Stars and Symbiosis: MicroRNA- and MicroRNA*-Mediated Transcript Cleavage Involved in Arbuscular Mycorrhizal Symbiosis

et al. 2011

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“…2). 6,13 IBA levels can be induced by abscisic acid (ABA) as demonstrated in maize. 18 Since Glomus intraradices contains considerable amounts of ABA in hyphae, the AM fungus might control IBA biosynthesis of its host via hormonal signals.…”

Section: A Self Regulatory Infection Cycle?mentioning

confidence: 99%

“…3,4 However, the literature on auxin levels during AM shows controversary results. There are several examples for an increase in auxins after inoculation of roots with AM fungi such as maize 5,6 or soybean. 7 In maize mainly indole-3-butyric acid (IBA) increased, 5,8 whereas indole-3-acetic acid (IAA) remained unaltered.…”

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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“…The phytohormones also help in alleviating the metal toxicity (Jentschek et al, 2000). Role of amino acid and sugar conjugates of IAA and IBA during AM development in maize has been described by Fitze et al, (2005). They have demonstrated the complex control mechanisms to regulate the levels of free and conjugated auxins.…”

Section: Discussionmentioning

confidence: 99%

Auxins in the development of an arbuscular mycorrhizal symbiosis in maize

Cited by 83 publications

References 34 publications

Stars and Symbiosis: MicroRNA- and MicroRNA*-Mediated Transcript Cleavage Involved in Arbuscular Mycorrhizal Symbiosis

Stars and Symbiosis: MicroRNA- and MicroRNA*-Mediated Transcript Cleavage Involved in Arbuscular Mycorrhizal Symbiosis

Auxins as Signals in Arbuscular Mycorrhiza Formation

Enzymatic and hormonal studies in Acacia eburnea infected with Ravenelia esculenta

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