Auxin: at the root of nodule development?

Mathesius, Ulrike

doi:10.1071/fp08177

Cited by 133 publications

(95 citation statements)

References 175 publications

(222 reference statements)

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“…Auxin transport inhibition appears to be specific for indeterminate nodulation, possibly reflecting the different requirements for cell division in either inner or outer cortical cells in the two types of nodules (Mathesius, 2008). These data clearly indicate the importance of flavonoids in the regulation of auxin transport during nodulation.…”

Section: Rhizobia Alter Host Auxin Transportmentioning

confidence: 48%

Manipulation of Auxin Transport in Plant Roots during Rhizobium Symbiosis and Nematode Parasitism

et al. 2009

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The plant rhizosphere harbors many different microorganisms, ranging from plant growth-promoting bacteria to devastating plant parasites. Some of these microbes are able to induce de novo organ formation in infected roots. Certain soil bacteria, collectively called rhizobia, form a symbiotic interaction with legumes, leading to the formation of nitrogen-fixing root nodules. Sedentary endoparasitic nematodes, on the other hand, induce highly specialized feeding sites in infected plant roots from which they withdraw nutrients. In order to establish these new root structures, it is thought that these organisms use and manipulate the endogenous molecular and physiological pathways of their hosts. Over the years, evidence has accumulated reliably demonstrating the involvement of the plant hormone auxin. Moreover, the auxin responses during microbe-induced de novo organ formation seem to be dynamic, suggesting that plant-associated microbes can actively modify their host's auxin transport. In this review, we focus on recent findings in auxin transport mechanisms during plant development and on how plant symbionts and parasites have evolved to manipulate these mechanisms for their own purposes.

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Section: Rhizobia Alter Host Auxin Transportmentioning

confidence: 48%

Manipulation of Auxin Transport in Plant Roots during Rhizobium Symbiosis and Nematode Parasitism

et al. 2009

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“…24,29 In contrast, auxin transport in indeterminate nodulators is transiently blocked just above the site of nodule initiation, while cytokinin appears to promote cell divisions and activate the nodule developmental program in the inner cortex. 28,32 The role of ABA during lateral root and nodule development is more complex. In lateral roots, ABA appears to function later than auxin and cytokinin, regulating meristem activity during emergence from the primary root, but the effect of exogenous ABA is opposite in legumes and non-legumes: promoting lateral root elongation in legumes, but inhibiting it in non-legumes.…”

Section: Auxin Cytokinin and Abscisic Acid Regulate Lateral Root Andmentioning

confidence: 99%

Control of root architecture and nodulation by theLATD/NIPtransporter

Harris

Dickstein

2010

Plant Signaling & Behavior

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Unlike most other plants, legumes form two kinds of lateral root organs: lateral roots and nitrogen-fixing root nodules that form in conjunction with compatible symbiotic rhizobium bacteria. Although the morphology and function of these two root organs is distinct, both require the function of the LATD/NIP gene, indicating shared genetic components for these two developmental processes and providing support for a model in which legume nodules evolved from a lateral root blueprint. Both lateral roots and nodules initiate in previously differentiated root cells in response to environmental and developmental cues mediated by hormones. Interestingly, regulation of nodules and lateral roots by hormones is often opposite, allowing formation of one organ or another depending on the conditions.

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“…Auxin is a crucial regulator of lateral root (Fukaki et al, 2007) and nodule (Mathesius, 2008) development. Lateral root initiation is dependent on auxin transport from the root tip to the lateral root initiation zone (Reed et al, 1998;Casimiro et al, 2001), whereas auxin transport from the shoot to the root is required for lateral root elongation (Bhalerao et al, 2002).…”

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confidence: 99%

The Autoregulation Gene SUNN Mediates Changes in Root Organ Formation in Response to Nitrogen through Alteration of Shoot-to-Root Auxin Transport

2012

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We tested whether a gene regulating nodule number in Medicago truncatula, Super Numeric Nodules (SUNN ), is involved in root architecture responses to carbon (C) and nitrogen (N) and whether this is mediated by changes in shoot-to-root auxin transport. Nodules and lateral roots are root organs that are under the control of nutrient supply, but how their architecture is regulated in response to nutrients is unclear. We treated wild-type and sunn-1 seedlings with four combinations of low or increased N (as nitrate) and C (as CO 2 ) and determined responses in C/N partitioning, plant growth, root and nodule density, and changes in auxin transport. In both genotypes, nodule density was negatively correlated with tissue N concentration, while only the wild type showed significant correlations between N concentration and lateral root density. Shoot-to-root auxin transport was negatively correlated with shoot N concentration in the wild type but not in the sunn-1 mutant. In addition, the ability of rhizobia to alter auxin transport depended on N and C treatment as well as the SUNN gene. Nodule and lateral root densities were negatively correlated with auxin transport in the wild type but not in the sunn-1 mutant. Our results suggest that SUNN is required for the modulation of shoot-to-root auxin transport in response to altered N tissue concentrations in the absence of rhizobia and that this controls lateral root density in response to N. The control of nodule density in response to N is more likely to occur locally in the root.

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Auxin: at the root of nodule development?

Cited by 133 publications

References 175 publications

Manipulation of Auxin Transport in Plant Roots during Rhizobium Symbiosis and Nematode Parasitism

Manipulation of Auxin Transport in Plant Roots during Rhizobium Symbiosis and Nematode Parasitism

Control of root architecture and nodulation by theLATD/NIPtransporter

The Autoregulation Gene SUNN Mediates Changes in Root Organ Formation in Response to Nitrogen through Alteration of Shoot-to-Root Auxin Transport

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