Environmental strigolactone drives early growth responses to neighboring plants and soil volume in pea

Wheeldon, Cara D.; Hamon‐Josse, Maxime; Lund, Hannah Lotte; Yoneyama, Kaori; Bennett, Tom

doi:10.1016/j.cub.2022.06.063

Cited by 21 publications

(16 citation statements)

References 43 publications

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“…From previous results suggesting a root signal between plants in NMS (Pélissier et al ., 2021a), we were expecting to find genes related with plant–plant signalling in the NMS1 locus. For instance, environmental strigolactones were recently shown to alter growth response in neighbouring plants (Wheeldon et al ., 2022). However, we did not find any gene coding for the biosynthesis of a molecule that could be an NMS signal.…”

Section: Discussionmentioning

confidence: 99%

A major genetic locus in neighbours controls changes of gene expression and susceptibility in intraspecific rice mixtures

et al. 2023

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Summary Reports indicate that intraspecific neighbours alter the physiology of focal plants, and with a few exceptions, their molecular responses to neighbours are unknown. Recently, changes in susceptibility to pathogen resulting from such interactions were demonstrated, a phenomenon called neighbour‐modulated susceptibility (NMS). However, the genetics of NMS and the associated molecular responses are largely unexplored. Here, we analysed in rice the modification of biomass and susceptibility to the blast fungus pathogen in the Kitaake focal genotype in the presence of 280 different neighbours. Using genome‐wide association studies, we identified the loci in the neighbour that determine the response in Kitaake. Using a targeted transcriptomic approach, we characterized the molecular responses in focal plants co‐cultivated with various neighbours inducing a reduction in susceptibility. Our study demonstrates that NMS is controlled by one major locus in the rice genome of its neighbour. Furthermore, we show that this locus can be associated with characteristic patterns of gene expression in focal plant. Finally, we propose an hypothesis where Pi could play a role in explaining this case of NMS. Our study sheds light on how plants affect the physiology in their neighbourhood and opens perspectives for understanding plant–plant interactions.

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Section: Discussionmentioning

confidence: 99%

A major genetic locus in neighbours controls changes of gene expression and susceptibility in intraspecific rice mixtures

et al. 2023

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“…As known root exudates that also influence plant growth, SLs are obvious candidates to act in neighbour detection, and recent work in pea and rice suggests that this is indeed the case. Wheeldon et al (2022) found that pea SL mutants fail to respond to the presence of neighbouring plants early in their life cycle, and that this is not caused by a failure of SL mutants to respond to other signals in the rhizosphere, but by the lack of SL signals in the rhizosphere itself. In mixed genotype competition experiments, SL synthesis mutants are effectively invisible, and become out-competed by their neighbours, while SL signalling mutants are effectively blind to their neighbours, and grow too large.…”

Section: Strigolactones As Intentional Rhizosphere Signalsmentioning

confidence: 99%

“…In mixed genotype competition experiments, SL synthesis mutants are effectively invisible, and become out-competed by their neighbours, while SL signalling mutants are effectively blind to their neighbours, and grow too large. Using SL synthesis mutants grown with WTs, Wheeldon et al (2022) and Yoneyama et al (2022) both showed that rice and pea both actively take up SLs exuded by their neighbours, and respond by down-regulating SL synthesis and exudation proportionally to neighbour density. The remarkable effect of this is that exuded SL levels in a shared soil volume are constant, irrespective of the number of plants sharing that volume.…”

Section: Strigolactones As Intentional Rhizosphere Signalsmentioning

confidence: 99%

Cracking the enigma: understanding strigolactone signalling in the rhizosphere

Clark,

Bennett

2023

Journal of Experimental Botany

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The rhizosphere is a complex physical and chemical interface between plants and their underground environment, both biotic and abiotic. Plants exude large number of chemicals into the rhizosphere in order to manipulate these biotic and abiotic components. Among such chemicals are strigolactones, ancient signalling molecules that in flowering plants act as both internal hormones and external rhizosphere signals. Plants exude strigolactones to communicate with their preferred symbiotic partners and neighbouring plants, but at least some classes of parasitic organisms are able to ‘crack’ these private messages and eavesdrop on the signals. In this review, we examine the intentional consequences of strigolactone exudation, and also the unintentional consequences caused by eavesdroppers. We examine the molecular mechanisms by which strigolactones act within the rhizosphere, and attempt to understand the enigma of the strigolactone molecular diversity synthesised and exude into the rhizosphere by plants. We conclude by looking at the prospects of using improved understanding of strigolactones in agricultural contexts.

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“…Hence, SLs released by plant roots are potentially communication signals between plants. Indeed, recent studies showed that canonical SLs released by rice and pea roots can affect the growth and development of nearby plants (Wheeldon et al, 2022;Yoneyama et al, 2022). Additionally, Yoneyama et al (2022) demonstrated that coplanting of d10 and WT rice seedlings suppressed the tillering phenotypes of d10 (Yoneyama et al, 2022).…”

Section: Metabolism Of Root Released-sls Acts As Communicating Signal...mentioning

confidence: 99%

Perspectives on the metabolism of strigolactone rhizospheric signals

et al. 2022

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Strigolactones (SLs) are a plant hormone regulating different processes in plant development and adjusting plant’s architecture to nutrition availability. Moreover, SLs are released by plants to communicate with beneficial fungi in the rhizosphere where they are, however, abused as chemical cues inducing seed germination of root parasitic weeds, e.g. Striga spp., and guiding them towards host plants in their vicinity. Based on their structure, SLs are divided into canonical and non-canonical SLs. In this perspective, we describe the metabolism of root-released SLs and SL pattern in rice max1-900 mutants, which are affected in the biosynthesis of canonical SLs, and show the accumulation of two putative non-canonical SLs, CL+30 and CL+14. Using max1-900 and SL-deficient d17 rice mutants, we further investigated the metabolism of non-canonical SLs and their possible biological roles. Our results show that the presence and further metabolism of canonical and non-canonical SLs are particularly important for their role in rhizospheric interactions, such as that with root parasitic plants. Hence, we proposed that the root-released SLs are mainly responsible for rhizospheric communications and have low impact on plant architecture, which makes targeted manipulation of root-released SLs an option for rhizospheric engineering.

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Environmental strigolactone drives early growth responses to neighboring plants and soil volume in pea

Cited by 21 publications

References 43 publications

A major genetic locus in neighbours controls changes of gene expression and susceptibility in intraspecific rice mixtures

A major genetic locus in neighbours controls changes of gene expression and susceptibility in intraspecific rice mixtures

Cracking the enigma: understanding strigolactone signalling in the rhizosphere

Perspectives on the metabolism of strigolactone rhizospheric signals

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