The perception of strigolactones in vascular plants

Lumba, Shelley; Holbrook-Smith, Duncan; McCourt, Peter

doi:10.1038/nchembio.2340

Cited by 56 publications

(42 citation statements)

References 96 publications

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“…Our results are also reminiscent of a recent study of the SMAX1‐LIKE (SMXL) family of proteins (Liang et al ., ). The SMXLs are repressors of strigolactone signaling that are degraded in response to the hormone strigolactone (Lumba et al ., ). Because the SMXLs have an EAR domain, it has been proposed that they are transcriptional repressors.…”

Section: Discussionmentioning

confidence: 97%

Mutational studies of the Aux/IAA proteins in Physcomitrella reveal novel insights into their function

Tao

Estelle

2018

New Phytologist

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Summary • The plant hormone auxin regulates many aspects of plant growth and development. Auxin signaling involves hormone perception by the TRANSPORT INHIBITOR RESPONSE/AUXIN F-BOX (TIR1/AFB)–Aux/IAA co-receptor system, and the subsequent degradation of the Aux/IAA transcriptional repressors by the ubiquitin proteasome pathway. This leads to the activation of downstream gene expression and diverse physiological responses. Here, we investigate how the structural elements in the Aux/IAAs determine their function in Auxin perception and transcriptional repression. • We took advantage of the facile genetics of the moss Physcomitrella patens to determine the activity of wild-type and mutant PpIAA1a proteins in a Δaux/iaa null background. In this way, Aux/IAA function was characterized at the molecular and physiological levels without the interference of genetic redundancy. • We identified and characterized degron variants in Aux/IAAs that affect their stability and Auxin response. We also demonstrated that neither the Aux/IAA EAR motif nor Aux/IAA oligomerization is essential for the repressive function of Aux/IAA. • Our study demonstrates how key elements within the Aux/IAA proteins fine tune stability and repressor activity, as well as the long-term developmental outcome.

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Section: Discussionmentioning

confidence: 97%

Mutational studies of the Aux/IAA proteins in Physcomitrella reveal novel insights into their function

Tao

Estelle

2018

New Phytologist

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“…Because many previous reviews have described SL biosynthesis, signalling, and perception in detail (Al‐Babili & Bouwmeester, ; Lopez‐Obando, Ligerot, Bonhomme, Boyer, & Rameau, ; Lumba, Holbrook‐Smith, & McCourt, ; Morffy, Faure, & Nelson, ; Waters, Gutjahr, Bennett, & Nelson, ), in this review, we will only briefly cover SL biosynthesis and signalling. Subsequently, exclusive focus will be given to the putative mechanisms of SLs in regulating plant adaptation to abiotic stresses, particularly nutrient deficiency, drought, and salinity.…”

Section: Introductionmentioning

confidence: 99%

Strigolactones in plant adaptation to abiotic stresses: An emerging avenue of plant research

Mostofa

Nguyen

et al. 2018

Plant Cell & Environment

158

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Phytohormones play central roles in boosting plant tolerance to environmental stresses, which negatively affect plant productivity and threaten future food security. Strigolactones (SLs), a class of carotenoid-derived phytohormones, were initially discovered as an "ecological signal" for parasitic seed germination and establishment of symbiotic relationship between plants and beneficial microbes. Subsequent characterizations have described their functional roles in various developmental processes, including root development, shoot branching, reproductive development, and leaf senescence. SLs have recently drawn much attention due to their essential roles in the regulation of various physiological and molecular processes during the adaptation of plants to abiotic stresses. Reports suggest that the production of SLs in plants is strictly regulated and dependent on the type of stresses that plants confront at various stages of development. Recently, evidence for crosstalk between SLs and other phytohormones, such as abscisic acid, in responses to abiotic stresses suggests that SLs actively participate within regulatory networks of plant stress adaptation that are governed by phytohormones. Moreover, the prospective roles of SLs in the management of plant growth and development under adverse environmental conditions have been suggested. In this review, we provide a comprehensive discussion pertaining to SL-mediated plant responses and adaptation to abiotic stresses.

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“…Future work is also needed to understand this SL‐dependent cell wall sensing mechanism. The SL field is making great advances to identify and measure the SL compounds which are active in different plant species, and to unravel how they are perceived and the signal transduced in some SL‐regulated processes (Reviewed in Lumba, Holbrook‐Smith, & McCourt, ; and Waters et al., ). SL signal transduction controlling shoot branching seems to be based upon hormone‐activated proteolysis of SL target proteins.…”

Section: Discussionmentioning

confidence: 99%

Growth‐ and stress‐related defects associated with wall hypoacetylation are strigolactone‐dependent

et al. 2018

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Mutants affected in the Arabidopsis TBL 29/ ESK 1 xylan O‐acetyltransferase display a strong reduction in total wall O ‐acetylation accompanied by a dwarfed plant stature, collapsed xylem morphology, and enhanced freezing tolerance. A newly identified tbl29/esk1 suppressor mutation reduces the expression of the MAX 4 gene, affecting the biosynthesis of methyl carlactonoate (Me CLA ), an active strigolactone ( SL ). Genetic and biochemical evidence suggests that blocking the biosynthesis of this SL is sufficient to recover all developmental and stress‐related defects associated with the TBL 29/ ESK 1 loss of function without affecting its direct effect—reduced wall O ‐acetylation. Altered levels of the MAX 4 SL biosynthetic gene, reduced branch number, and higher levels of Me CLA , were also found in tbl29/esk1 plants consistent with a constitutive activation of the SL pathway. These results suggest that the reduction in O ‐acetyl substituents in xylan is not directly responsible for the observed tbl29/esk1 phenotypes. Alternatively, plants may perceive defects in the structure of wall polymers and/or wall architecture activating the SL hormonal pathway as a compensatory mechanism.

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The perception of strigolactones in vascular plants

Cited by 56 publications

References 96 publications

Mutational studies of the Aux/IAA proteins in Physcomitrella reveal novel insights into their function

Mutational studies of the Aux/IAA proteins in Physcomitrella reveal novel insights into their function

Strigolactones in plant adaptation to abiotic stresses: An emerging avenue of plant research

Growth‐ and stress‐related defects associated with wall hypoacetylation are strigolactone‐dependent

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