<i>NOOT</i>‐Dependent Control of Nodule Identity: Nodule Homeosis and Merirostem Perturbation

Couzigou, Jean‐Malo; Ratet, Pascal

doi:10.1002/9781119053095.ch49

Cited by 3 publications

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“…A similar nodule to root conversion phenotype was described in Glycine max determinate nodules inoculated with Bradyrhizobium japonicum mutant strains (Δ phyR , Δ ecfG ; Gourion et al ., ) but the origin of the nodule ectopic roots was not described in this context. In this study we demonstrate that ectopic roots arising from determinate nodules are initiated from the NVB as hypothesized by Couzigou and Ratet (). This finding is in agreement with the literature describing nodule ectopic roots that initiate from NVM (VandenBosch et al ., ; Akasaka et al ., ; Voroshilova et al ., ; Ferraioli et al ., ; Ferguson and Reid, ; Sinharoy and DasGupta, ; Couzigou et al ., ; Couzigou and Ratet, ).…”

Section: Discussionsupporting

confidence: 80%

“…In this study we demonstrate that ectopic roots arising from determinate nodules are initiated from the NVB as hypothesized by Couzigou and Ratet (). This finding is in agreement with the literature describing nodule ectopic roots that initiate from NVM (VandenBosch et al ., ; Akasaka et al ., ; Voroshilova et al ., ; Ferraioli et al ., ; Ferguson and Reid, ; Sinharoy and DasGupta, ; Couzigou et al ., ; Couzigou and Ratet, ). The low penetrance of the nodule to root conversion in Ljnbcl1 compared with Pscoch1 or Mtnoot1 suggests that one of the roles of the NCM in indeterminate nodules is to maintain an active NVM to confer indeterminate growth.…”

Section: Discussionsupporting

confidence: 80%

“…Nodule identity studies were initiated with studies of P. sativum cochleata1 ( Pscoch1 ) and M. truncatula nodule‐root1 ( Mtnoot1 ) noot‐bop‐coch‐like ( nbcl ) mutants, affected in the maintenance of nodule identity (Ferguson and Reid, ; Couzigou et al ., ). These mutants are characterized by the emergence of root‐like structures from the NVM (VandenBosch et al ., ; Akasaka et al ., ; Voroshilova et al ., ; Ferraioli et al ., ; Ferguson and Reid, ; Sinharoy and DasGupta, ; Couzigou et al ., ; Couzigou and Ratet, ). In indeterminate nodules, the role of these two genes is to repress the root identity of the NVM (Couzigou et al ., ).…”

Section: Introductionmentioning

confidence: 98%

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Lotus japonicus NOOT‐BOP‐COCH‐LIKE1 is essential for nodule, nectary, leaf and flower development

et al. 2018

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The NOOT-BOP-COCH-LIKE (NBCL) genes are orthologs of Arabidopsis thaliana BLADE-ON-PETIOLE1/2. The NBCLs are developmental regulators essential for plant shaping, mainly through the regulation of organ boundaries, the promotion of lateral organ differentiation and the acquisition of organ identity. In addition to their roles in leaf, stipule and flower development, NBCLs are required for maintaining the identity of indeterminate nitrogen-fixing nodules with persistent meristems in legumes. In legumes forming determinate nodules, without persistent meristem, the roles of NBCL genes are not known. We thus investigated the role of Lotus japonicus NOOT-BOP-COCH-LIKE1 (LjNBCL1) in determinate nodule identity and studied its functions in aerial organ development using LORE1 insertional mutants and RNA interference-mediated silencing approaches. In Lotus, LjNBCL1 is involved in leaf patterning and participates in the regulation of axillary outgrowth. Wild-type Lotus leaves are composed of five leaflets and possess a pair of nectaries at the leaf axil. Legumes such as pea and Medicago have a pair of stipules, rather than nectaries, at the base of their leaves. In Ljnbcl1, nectary development is abolished, demonstrating that nectaries and stipules share a common evolutionary origin. In addition, ectopic roots arising from nodule vascular meristems and reorganization of the nodule vascular bundle vessels were observed on Ljnbcl1 nodules. This demonstrates that NBCL functions are conserved in both indeterminate and determinate nodules through the maintenance of nodule vascular bundle identity. In contrast to its role in floral patterning described in other plants, LjNBCL1 appears essential for the development of both secondary inflorescence meristem and floral meristem.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 98%

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Lotus japonicus NOOT‐BOP‐COCH‐LIKE1 is essential for nodule, nectary, leaf and flower development

et al. 2018

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“…Genetic evidence supports the idea that the mechanisms used by plants for developing nodules have been co-opted and slightly modified from those used to form lateral roots in most plants [70]. For example, legume mutants in the transcription factor NOOT form nodules with a meristem that reverts to a lateral root identity [71]. Altogether, genetic and evolutionary studies indicate that root nodulation evolved from recruiting pre-existing mechanisms of arbuscular mycorrhizal associations and lateral root development, connecting NIN and possibly other proteins into the CSP, and bringing auxin and cytokinin together to drive nodule development [72–75].…”

Section: Introductionmentioning

confidence: 95%

Are we there yet? The long walk towards the development of efficient symbiotic associations between nitrogen-fixing bacteria and non-leguminous crops

et al. 2019

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Nitrogen is an essential element of life, and nitrogen availability often limits crop yields. Since the Green Revolution, massive amounts of synthetic nitrogen fertilizers have been produced from atmospheric nitrogen and natural gas, threatening the sustainability of global food production and degrading the environment. There is a need for alternative means of bringing nitrogen to crops, and taking greater advantage of biological nitrogen fixation seems a logical option. Legumes are used in most cropping systems around the world because of the nitrogen-fixing symbiosis with rhizobia. However, the world's three major cereal crops—rice, wheat, and maize—do not associate with rhizobia. In this review, we will survey how genetic approaches in rhizobia and their legume hosts allowed tremendous progress in understanding the molecular mechanisms controlling root nodule symbioses, and how this knowledge paves the way for engineering such associations in non-legume crops. We will also discuss challenges in bringing these systems into the field and how they can be surmounted by interdisciplinary collaborations between synthetic biologists, microbiologists, plant biologists, breeders, agronomists, and policymakers.

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“…The redundant BLADE‐ON‐PETIOLE transcriptional regulators in A. thaliana (BOP1 and BOP2; Fig. ) and the NODULE ROOT (NOOT) and COCHLEATA (COCH) proteins in Medicago truncatula and Pisum sativum were shown to be necessary for correct regulation of many developmental processes (reviewed in Hofer & Ellis, ; Khan et al ., ; Couzigou & Ratet, ). This includes leaf patterning in both proximo‐distal and abaxial–adaxial axes in A. thaliana , as well as stipule patterning in legumes and A. thaliana (McKim et al ., ; Couzigou et al ., ).…”

Section: Introductionmentioning

confidence: 99%

The legume NOOT‐BOP‐COCH‐LIKE genes are conserved regulators of abscission, a major agronomical trait in cultivated crops

et al. 2015

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SummaryPlants are able to lose organs selectively through a process called abscission. This process relies on the differentiation of specialized territories at the junction between organs and the plant body that are called abscission zones (AZ). Several genes control the formation or functioning of these AZ.We have characterized BLADE-ON-PETIOLE (BOP) orthologues from several legume plants and studied their roles in the abscission process using a mutant approach.Here, we show that the Medicago truncatula NODULE ROOT (NOOT), the Pisum sativum COCHLEATA (COCH) and their orthologue in Lotus japonicus are strictly necessary for the abscission of not only petals, but also leaflets, leaves and fruits. We also showed that the expression pattern of the M. truncatula pNOOT::GUS fusion is associated with functional and vestigial AZs when expressed in Arabidopsis. In addition, we show that the stip mutant from Lupinus angustifolius, defective in stipule formation and leaf abscission, is mutated in a BOP orthologue.In conclusion, this study shows that this clade of proteins plays an important conserved role in promoting abscission of all aerial organs studied so far.

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NOOT‐Dependent Control of Nodule Identity: Nodule Homeosis and Merirostem Perturbation

Cited by 3 publications

References 99 publications

Lotus japonicus NOOT‐BOP‐COCH‐LIKE1 is essential for nodule, nectary, leaf and flower development

Lotus japonicus NOOT‐BOP‐COCH‐LIKE1 is essential for nodule, nectary, leaf and flower development

Are we there yet? The long walk towards the development of efficient symbiotic associations between nitrogen-fixing bacteria and non-leguminous crops

The legume NOOT‐BOP‐COCH‐LIKE genes are conserved regulators of abscission, a major agronomical trait in cultivated crops

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