Natural variation at XND1 impacts root hydraulics and trade-off for stress responses in Arabidopsis

Tang, Ning; Shahzad, Zaigham; Lonjon, Fabien; Loudet, Olivier; Vailleau, Fabienne; Maurel, Christophe

doi:10.1038/s41467-018-06430-8

Cited by 75 publications

(55 citation statements)

References 56 publications

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“…In group VIII, the homologous genes AhNAC127 and AhNAC63 from the A and B genomes were clustered in the same branch as Arabidopsis XND1 (AT5G64530.1), and both proteins had 70.16% sequence similarity with XND1. XND1 could indirectly affect aquaporin function to reduce its tolerance to drought stress ( Tang et al, 2018 ). The other members in this subclade, AhNAC21 and AhNAC90, also had 65.1% and 65.63% sequence identity with XND1 ( Supplementary Table 4 ).…”

Section: Resultsmentioning

confidence: 99%

Genome-Wide Identification of NAC Transcription Factors and Their Functional Prediction of Abiotic Stress Response in Peanut

Peng

et al. 2021

Front. Genet.

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The NAC transcription factor (TF) is one of the most significant TFs in plants and is widely involved in plant growth, development, and responses to biotic and abiotic stresses. To date, there are no systematic studies on the NAC family in peanuts. Herein, 132 AhNACs were identified from the genome of cultivated peanut, and they were classified into eight subgroups (I–VIII) based on phylogenetic relationships with Arabidopsis NAC proteins and their conserved motifs. These genes were unevenly scattered on all 20 chromosomes, among which 116 pairs of fragment duplication events and 1 pair of tandem duplications existed. Transcriptome analysis showed that many AhNAC genes responded to drought and abscisic acid (ABA) stresses, especially most of the members in groups IV, VII, and VIII, which were expressed at larger differential levels under polyethylene glycol (PEG) and/or ABA treatment in roots or leaves. Furthermore, 20 of them selected in response to PEG and ABA treatment were evaluated by quantitative real-time polymerase chain reaction. The results showed that these genes significantly responded to drought and ABA in roots and/or leaves. This study was helpful for guiding the functional characterization and improvement of drought-resistant germplasms in peanuts.

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Section: Resultsmentioning

confidence: 99%

Genome-Wide Identification of NAC Transcription Factors and Their Functional Prediction of Abiotic Stress Response in Peanut

Peng

et al. 2021

Front. Genet.

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“…To look for genes involved in the regulation of root xylem development and vascular lignification following GA 3 application, we identified the following sweetpotato orthologues of the respective Arabidopsis genes: IbNAC075 (upstream regulator of VND7) (Endo et al, 2015), IbVND7 (involved in xylem vessel differentiation) (Yamaguchi et al, 2008), IbSND2 (regulator of genes involved in secondary wall development) (Hussey et al, 2011), IbXND1 (negative regulator of xylem formation) (Tang et al, 2018), IbVNI2 (transcriptional repressor of VND7) (Yamaguchi et al, 2010), and IbVNI2 -like ( Table 1 ) and their transcript profiles were investigated ( Figure 9 ). The expression of all tested positive regulators ( Figure 9A ) was induced by GA 3 treatment as evident in ARs sampled at 5W after planting, while expression of IbNAC075 was upregulated earlier, already at 2W ( Figure 9A ).…”

Section: Resultsmentioning

confidence: 99%

Gibberellin Promotes Sweetpotato Root Vascular Lignification and Reduces Storage-Root Formation

et al. 2019

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Sweetpotato yield depends on a change in the developmental fate of adventitious roots into storage-roots. The mechanisms underlying this developmental switch are still unclear. We examined the hypothesis claiming that regulation of root lignification determines storage-root formation. We show that application of the plant hormone gibberellin increased stem elongation and root gibberellin levels, while having inhibitory effects on root system parameters, decreasing lateral root number and length, and significantly reducing storage-root number and diameter. Furthermore, gibberellin enhanced root xylem development, caused increased lignin deposition, and, at the same time, decreased root starch accumulation. In accordance with these developmental effects, gibberellin application upregulated expression levels of sweetpotato orthologues of Arabidopsis vascular development regulators (IbNA075, IbVND7, and IbSND2) and of lignin biosynthesis genes (IbPAL, IbC4H, Ib4CL, IbCCoAOMT, and IbCAD), while downregulating starch biosynthesis genes (IbAGPase and IbGBSS) in the roots. Interestingly, gibberellin downregulated root expression levels of orthologues of the Arabidopsis BREVIPEDICELLUS transcription factor (IbKN2 and IbKN3), regulator of meristem maintenance. The results substantiate our hypothesis and mark gibberellin as an important player in regulation of sweetpotato root development, suggesting that increased fiber formation and lignification inhibit storage-root formation and yield. Taken together, our findings provide insight into the mechanisms underlying sweetpotato storage-root formation and provide a valuable database of genes for further research.

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“…Reduced water availability in root surroundings, caused by salt and osmotic stress, has been shown to reduce root hydraulic conductivity (Lp r )the ability of roots to transport water from soil across a water potential gradient to the shoot xylem [16][17][18][19]. Under water-limitation conditions, Lp r in both rice (Oryza sativum) and arabidopsis (Arabidopsis thaliana) was shown to be positively associated with shoot dry weight, suggesting that an increase in Lp r could improve plant performance [16,20]. Recently, the XYLEM NAC DOMAIN 1 (XND1) transcription factor was identified as a negative regulator of Lp r in arabidopsis [16].…”

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confidence: 99%

How roots and shoots communicate through stressful times

Testerink

Zhang

2021

Trends in Plant Science

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When plants face an environmental stress such as water deficit, soil salinity, high temperature, or shade, good communication between above-and belowground organs is necessary to coordinate growth and development. Various signals including hormones, peptides, proteins, hydraulic signals, and metabolites are transported mostly through the vasculature to distant tissues. How shoots and roots synchronize their response to stress using mobile signals is an emerging field of research. We summarize recent advances on mobile signals regulating shoot stomatal movement and root development in response to highly localized environmental cues. In addition, we highlight how the vascular system is not only a conduit but is also flexible in its development in response to abiotic stress. Shoot-root communication: a long-distance relationship Tissues in higher plants are highly specialized. The shoot captures solar energy by photosynthesis and carries out reproduction, whereas the root extracts water and minerals from the soil. The coordination of these specialized functions is critical for plants to thrive. The plant vascular system, comprising xylem and phloem (see Glossary), supports the plant body while also transporting many signaling molecules from shoots to roots and vice versa. Hormones are well-studied integrators of root and shoot development. Abscisic acid (ABA) [1], auxin [2], gibberellins [3], cytokinins (CKs) [4], and jasmonic acid and its relatives [5] are known to travel through the vasculature and to act in distant tissues (Figure 1, Key figure). More recently, several small peptides, proteins, and RNA molecules have been found to be mobile in xylem or phloem and to coordinate nutrient uptake and distal stress responses [6-10] (Figure 1).Localized environmental stresses such as soil salinity or light signals require controlled longdistance transport of stress signals to elicit acclimation responses at the whole-plant level [11,12]. Understanding how mobile signals activate distal stress-responsive signaling pathways and how local and distant developmental pathways are reprogrammed is an important aspect of abiotic stress tolerance. The long-distance signaling that mediates the nutrient stress response has been recently reviewed [7]. In this review we focus on recent developments in how different mobile signals coordinate shoot stomatal movements and root development in response to salinity, water-related stresses, and light and temperature changes. Furthermore, we highlight the developmental plasticity of the plant vascular system which is the central transportation path that allows mobile signals to travel over long distances in times of stress. Bottom-up approaches: stressed roots signal to shootsRoot-derived hydraulic signals mediate the plant shoot stress response Water limitation has a profound impact on plant growth [13]. Water absorbed from the soil moves radially to the root xylem both via the apoplastic pathway and via cell-to-cell pathways through transcellular transport and the symplastic pathway. Subs...

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Natural variation at XND1 impacts root hydraulics and trade-off for stress responses in Arabidopsis

Cited by 75 publications

References 56 publications

Genome-Wide Identification of NAC Transcription Factors and Their Functional Prediction of Abiotic Stress Response in Peanut

Genome-Wide Identification of NAC Transcription Factors and Their Functional Prediction of Abiotic Stress Response in Peanut

Gibberellin Promotes Sweetpotato Root Vascular Lignification and Reduces Storage-Root Formation

How roots and shoots communicate through stressful times

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