Strigolactones and Auxin Cooperate to Regulate Maize Root Development and Response to Nitrate

Ravazzolo, Laura; Boutet-Mercey, Stéphanie; Perreau, François; Forestan, Cristian; Varotto, Serena; Ruperti, Benedetto; Quaggiotti, Silvia

doi:10.1093/pcp/pcab014

Cited by 25 publications

(13 citation statements)

References 84 publications

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“…In contrast, strigolactone is involved in the nutrient-responsive suppression of shoot axillary bud outgrowth ( Gomez-Roldan et al, 2008 ; Umehara et al, 2008 ; Minakuchi et al, 2010 ; Umehara et al, 2010 ). Strigolactone biosynthetic genes are known to be upregulated in the roots of O. sativa and maize ( Zea mays ) under nitrogen-deficient ( Sun et al, 2014 ; Xu et al, 2015 ; Ravazzolo et al, 2019 , 2021 ; Bellegarde and Sakakibara, 2021 ) and phosphorus-deficient ( Umehara et al, 2010 ) conditions.…”

Section: Introductionmentioning

confidence: 99%

Regulation of ammonium acquisition and use in Oryza longistaminata ramets under nitrogen source heterogeneity

et al. 2022

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Oryza longistaminata, a wild rice, vegetatively reproduces and forms a networked clonal colony consisting of ramets connected by rhizomes. Although water, nutrients, and other molecules can be transferred between ramets via the rhizomes, inter-ramet communication in response to spatially heterogeneous nitrogen availability is not well understood. We studied the response of ramet pairs to heterogeneous nitrogen availability using a split hydroponic system that allowed each ramet root to be exposed to different conditions. Ammonium uptake was compensatively enhanced in the sufficient-side root when roots of the ramet pairs were exposed to ammonium-sufficient and -deficient conditions. Comparative transcriptome analysis revealed that a gene regulatory network for effective ammonium assimilation and amino acid biosynthesis was activated in the sufficient-side roots. Allocation of absorbed nitrogen from the nitrogen-sufficient to the -deficient ramets was rather limited. Nitrogen was preferentially used for newly growing axillary buds on the sufficient-side ramets. Biosynthesis of trans-zeatin, a cytokinin, was up-regulated in response to the nitrogen supply, but trans-zeatin appeared not to target the compensatory regulation. Our results also implied that the O. longistaminata putative ortholog of rice (Oryza sativa) C-terminally encoded peptide1 (OsCEP1) plays a role as a nitrogen-deficient signal in inter-ramet communication, providing compensatory up-regulation of nitrogen assimilatory genes. These results provide insights into the molecular basis for efficient growth strategies of asexually proliferating plants growing in areas where the distribution of ammonium ions is spatially heterogeneous.

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Section: Introductionmentioning

confidence: 99%

Regulation of ammonium acquisition and use in Oryza longistaminata ramets under nitrogen source heterogeneity

et al. 2022

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“…Besides NO, strigolactones (SLs) also are supposed to take part to the nitrate regulation of root development in maize, possibly through a combined action with auxin [20,29,30]. However, the exact interplay among NO, SLs, and auxin in the overall process is still far from being fully understood.…”

Section: Discussionmentioning

confidence: 99%

“…Recent papers [29,30] evidenced a crucial involvement of both auxin and strigolactones, which act both in a connected and synergistic way or autonomously to regulate maize root response to nitrate. The present results suggest that the auxin signaling might at least in part depend on the NO production occurring immediately after the provision of nitrate, as also hypothesized by Manoli et al [27].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, Ravazzolo et al [29] demonstrated that N-deficiency strongly induces SL exudation by maize roots and that the supply of nitrate rapidly switches off this process. More recently, it has been also suggested that nitrate induces lateral root development at least in part through auxin and that this mechanism depends on the upstream inhibition of SL production observed after nitrate supply [30]. Previous results by Manoli et al [27] seem to suggest that NO production, being an early fine-tuned signature of nitrate perception, might induce SL inhibition and the concomitant auxin action, thus lastly regulating the lateral root growth.…”

Section: Introductionmentioning

confidence: 96%

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Nitrate Regulates Maize Root Transcriptome through Nitric Oxide Dependent and Independent Mechanisms

Ravazzolo

Trevisan

Iori

et al. 2021

IJMS

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Maize root responds to nitrate by modulating its development through the coordinated action of many interacting players. Nitric oxide is produced in primary root early after the nitrate provision, thus inducing root elongation. In this study, RNA sequencing was applied to discover the main molecular signatures distinguishing the response of maize root to nitrate according to their dependency on, or independency of, nitric oxide, thus discriminating the signaling pathways regulated by nitrate through nitric oxide from those regulated by nitrate itself of by further downstream factors. A set of subsequent detailed functional annotation tools (Gene Ontology enrichment, MapMan, KEGG reconstruction pathway, transcription factors detection) were used to gain further information and the lateral root density was measured both in the presence of nitrate and in the presence of nitrate plus cPTIO, a specific NO scavenger, and compared to that observed for N-depleted roots. Our results led us to identify six clusters of transcripts according to their responsiveness to nitric oxide and to their regulation by nitrate provision. In general, shared and specific features for the six clusters were identified, allowing us to determine the overall root response to nitrate according to its dependency on nitric oxide.

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“…The cell organelles of corn plants respond quickly to variations in ambient temperature, sometimes causing the alteration of biochemical and molecular pathways in all parts of the cells ( Kosová et al, 2018 ). ‘HS’ conditions trigger a biochemical response in maize plants where phenolic compounds increase to work against oxidative stress in the cells ( Ravazzolo et al, 2021 ). Phenolic compounds are biochemical materials involved in the vital activities of plants that reduce oxidative effects ( Halliwell, 2006 ; Dong et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Physiological and biochemical responses of hybrid maize (Zea mays L.) varieties grown under heat stress conditions

Taş¹

2022

PeerJ

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Maize (Zea mays L.) is the second most commonly produced and consumed crop after wheat globally and is adversely affected by high heat, which is a significant abiotic stress factor. This study was carried out to determine the physiological and biochemical responses of hybrid corn varieties under heat stress (‘HS’) compared to control (‘C’) conditions during the 2020 and 2021 growing seasons. The experiment was conducted under natural conditions in the Southeastern region of Turkey, where the most intense temperatures are experienced. This experiment used split plots in randomized blocks with three replications, with ‘HS’ and ‘C’ growing conditions applied to the main plots and the different hybrid corn varieties (FAO 650) planted on the sub plots. Mean values of days to 50% tasseling (DT, day), grain yield (GY, kg ha−1), leaf water potential (LWP, %), chlorophyll-a (Chl-a, mg g−1), cell membrane damage (CMD, %), and total phenol content (TPC, μg g−1) were significantly different between years, growing conditions, and hybrid corn varieties. Changes in the climate played a significant role in the differences between the years and growing conditions (GC), while the genetic characteristics of the different corn varieties explained the differences in outcomes between them. The values of DT, GY, LWP, Chl-a, CMD, and TPC ranged from 49.06–53.15 days, 9,173.0–10,807.2 kg ha−1, 78.62–83.57%, 6.47–8.62 mg g−1, 9.61–13.54%, and 232.36–247.01 μg g−1, respectively. Significant correlations were recorded between all the parameters. Positive correlations were observed between all the variables except for CMD. The increased damage to cell membranes under ‘HS’ caused a decrease in the other measured variables, especially GY. In contrast, the GY increased with decreased CMD. CMD was important in determining the stress and tolerance level of corn varieties under ‘HS’ conditions. The GY and other physiological parameters of ADA 17.4 and SYM-307 candidate corn varieties surpassed the control hybrid corn cultivars. The results revealed that the ADA 17.4 and SYM-307 cultivars might have ‘HS’-tolerate genes.

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Strigolactones and Auxin Cooperate to Regulate Maize Root Development and Response to Nitrate

Cited by 25 publications

References 84 publications

Regulation of ammonium acquisition and use in Oryza longistaminata ramets under nitrogen source heterogeneity

Regulation of ammonium acquisition and use in Oryza longistaminata ramets under nitrogen source heterogeneity

Nitrate Regulates Maize Root Transcriptome through Nitric Oxide Dependent and Independent Mechanisms

Physiological and biochemical responses of hybrid maize (Zea mays L.) varieties grown under heat stress conditions

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