Strigolactones fine-tune the root system

Rasmussen, Amanda; Depuydt, Stephen; Goormachtig, Sofie; Geelen, Danny

doi:10.1007/s00425-013-1911-3

Cited by 55 publications

(40 citation statements)

References 108 publications

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“…Additionally, SLs may reduce localized availability of free auxin, thereby altering AR/LR development response. 69 The present work reports for the first time a negative modulation of CCD activity by endogenous nitric oxide, since NO depletion by cPTIO treatment significantly enhances CCD activity. The basic molecular structure of CCDs shows that they contain a Fe 2C in the active site, which is coordinated by 4 conserved histidine residues.…”

Section: Discussionmentioning

confidence: 88%

“…SLs may bring about these changes in the localized auxin level either by altering auxin biosynthesis or its polar transport. 69 Role of SLs in reducing polar auxin transport has also been made evident through its effect on PIN distribution. Recently, a depletion of PIN1 from the xylem parenchyma cells was observed in response to SL.…”

Section: Discussionmentioning

confidence: 99%

“…68 Among higher plants, SLs regulate plant architecture through a modulation of shoot branching and root growth and development. 69 They are known to be synthesized both in root and stem and are transported across xylem. 70 In Petunia, ATP binding cassette (ABC transporter) PDR1 has been reported to be critical for SL transport.…”

Section: Discussionmentioning

confidence: 99%

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Nitric oxide mediates strigolactone signaling in auxin and ethylene-sensitive lateral root formation in sunflower seedlings

Bharti

Bhatla²

2015

Plant Signaling & Behavior

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Strigolactones (SLs) play significant role in shaping root architecture whereby auxin-SL crosstalk has been observed in SL-mediated responses of primary root elongation, lateral root formation and adventitious root (AR) initiation. Whereas GR24 (a synthetic strigolactone) inhibits LR and AR formation, the effect of SL biosynthesis inhibitor (fluridone) is just the opposite (root proliferation). Naphthylphthalamic acid (NPA) leads to LR proliferation but completely inhibits AR development. The diffusive distribution of PIN1 in the provascular cells in the differentiating zone of the roots in response to GR24, fluridone or NPA treatments further indicates the involvement of localized auxin accumulation in LR development responses. Inhibition of LR formation by GR24 treatment coincides with inhibition of ACC synthase activity. Profuse LR development by fluridone and NPA treatments correlates with enhanced [Ca 2C ] cyt in the apical region and differentiating zones of LR, indicating a critical role of [Ca 2C ] in LR development in response to the coordinated action of auxins, ethylene and SLs. Significant enhancement of carotenoid cleavage dioxygenase (CCD) activity (enzyme responsible for SL biosynthesis) in tissue homogenates in presence of cPTIO (NO scavenger) indicates the role of endogenous NO as a negative modulator of CCD activity. Differences in the spatial distribution of NO in the primary and lateral roots further highlight the involvement of NO in SL-modulated root morphogenesis in sunflower seedlings. Present work provides new report on the negative modulation of SL biosynthesis through modulation of CCD activity by endogenous nitric oxide during SL-modulated LR development.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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Nitric oxide mediates strigolactone signaling in auxin and ethylene-sensitive lateral root formation in sunflower seedlings

Bharti

Bhatla²

2015

Plant Signaling & Behavior

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“…Nitrogen and phosphorus deficiency responses were lost in the rice strigolactone mutants (Sun et al, 2014), demonstrating the importance of the strigolactone signaling pathway for nutrient responses in monocot roots (Umehara, 2011). However, the exact nature of the interaction between low nutrients, increased strigolactones, and changes in root architecture is not well understood (Rasmussen et al, 2013).…”

Section: Nutrient Changes Alter Hormone Signaling In Adventitious Rootsmentioning

confidence: 99%

The Physiology of Adventitious Roots

2015

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Adventitious roots are plant roots that form from any nonroot tissue and are produced both during normal development (crown roots on cereals and nodal roots on strawberry [Fragaria spp.]) and in response to stress conditions, such as flooding, nutrient deprivation, and wounding. They are important economically (for cuttings and food production), ecologically (environmental stress response), and for human existence (food production). To improve sustainable food production under environmentally extreme conditions, it is important to understand the adventitious root development of crops both in normal and stressed conditions. Therefore, understanding the regulation and physiology of adventitious root formation is critical for breeding programs. Recent work shows that different adventitious root types are regulated differently, and here, we propose clear definitions of these classes. We use three case studies to summarize the physiology of adventitious root development in response to flooding (case study 1), nutrient deficiency (case study 2), and wounding (case study 3).

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“…Strigolactones are known to affect RSA by inhibiting adventitious root formation, increasing PR length and affecting LR formation depending on the nutrient conditions (Rasmussen et al, 2013a). Recently, they were shown to be important for water stress responses, as strigolactone-deficient max mutants were hypersensitive to drought and salinity, most likely because of their increased stomatal density, However, as the effect of root branching was not examined in great detail in that study, a role for the root system in this response cannot be excluded (Ha et al, 2014).…”

Section: Other Phytohormones In Rsa Controlmentioning

confidence: 99%

The Art of Being Flexible: How to Escape from Shade, Salt, and Drought

2014

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Environmental stresses, such as shading of the shoot, drought, and soil salinity, threaten plant growth, yield, and survival. Plants can alleviate the impact of these stresses through various modes of phenotypic plasticity, such as shade avoidance and halotropism. Here, we review the current state of knowledge regarding the mechanisms that control plant developmental responses to shade, salt, and drought stress. We discuss plant hormones and cellular signaling pathways that control shoot branching and elongation responses to shade and root architecture modulation in response to drought and salinity. Because belowground stresses also result in aboveground changes and vice versa, we then outline how a wider palette of plant phenotypic traits is affected by the individual stresses. Consequently, we argue for a research agenda that integrates multiple plant organs, responses, and stresses. This will generate the scientific understanding needed for future crop improvement programs aiming at crops that can maintain yields under variable and suboptimal conditions.

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Strigolactones fine-tune the root system

Cited by 55 publications

References 108 publications

Nitric oxide mediates strigolactone signaling in auxin and ethylene-sensitive lateral root formation in sunflower seedlings

Nitric oxide mediates strigolactone signaling in auxin and ethylene-sensitive lateral root formation in sunflower seedlings

The Physiology of Adventitious Roots

The Art of Being Flexible: How to Escape from Shade, Salt, and Drought

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