A step towards understanding plant responses to multiple environmental stresses: a genome‐wide study

Sewelam, Nasser; Oshima, Yoshimi; Mitsuda, Nobutaka; Ohme‐Takagi, Masaru

doi:10.1111/pce.12274

Cited by 120 publications

(87 citation statements)

References 54 publications

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“…combination unique DEGs). The extent and composition of combination unique DEGs varied among different studies, but it has been shown that the multifactorial nature of stress combinations limits the ability to predict plants' transcriptional responses based on the corresponding single stresses (Prasch and Sonnewald, 2013;Rasmussen et al, 2013;Sewelam et al, 2014;Suzuki et al, 2016). Investigation of the transcriptional changes of 1,550 common stress DEGs yielded four different response patterns of triple-and double-stress combinations that varied in response mode partitions (Supplemental Fig.…”

Section: Discussionmentioning

confidence: 99%

Unique Physiological and Transcriptional Shifts under Combinations of Salinity, Drought, and Heat

Shaar-Moshe

Blumwald²,

Peleg³

2017

Plant Physiol.

110

101

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Climate-change-driven stresses such as extreme temperatures, water deficit, and ion imbalance are projected to exacerbate and jeopardize global food security. Under field conditions, these stresses usually occur simultaneously and cause damages that exceed single stresses. Here, we investigated the transcriptional patterns and morpho-physiological acclimations of Brachypodium dystachion to single salinity, drought, and heat stresses, as well as their double and triple stress combinations. Hierarchical clustering analysis of morpho-physiological acclimations showed that several traits exhibited a gradually aggravating effect as plants were exposed to combined stresses. On the other hand, other morphological traits were dominated by salinity, while some physiological traits were shaped by heat stress. Response patterns of differentially expressed genes, under single and combined stresses (i.e. common stress genes), were maintained only among 37% of the genes, indicating a limited expression consistency among partially overlapping stresses. A comparison between common stress genes and genes that were uniquely expressed only under combined stresses (i.e. combination unique genes) revealed a significant shift from increased intensity to antagonistic responses, respectively. The different transcriptional signatures imply an alteration in the mode of action under combined stresses and limited ability to predict plant responses as different stresses are combined. Coexpression analysis coupled with enrichment analysis revealed that each gene subset was enriched with different biological processes. Common stress genes were enriched with known stress response pathways, while combination unique-genes were enriched with unique processes and genes with unknown functions that hold the potential to improve stress tolerance and enhance cereal productivity under suboptimal field conditions.

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Section: Discussionmentioning

confidence: 99%

Unique Physiological and Transcriptional Shifts under Combinations of Salinity, Drought, and Heat

Shaar-Moshe

Blumwald²,

Peleg³

2017

Plant Physiol.

110

101

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“…In their natural habitats, plants are exposed to multiple stresses, and responses to them in general differ from the responses to single stresses or a sum of the individual stresses. Transcriptomics and proteomics studies were the first to reveal the complexity of the response to multiple stresses (Rizhsky et al, 2002;Koussevitzky et al, 2008;Rasmussen et al, 2013;Rivero et al, 2014;Sewelam et al, 2014). Besides the transcriptional responses to multiple stresses, their physiological consequences have been studied only recently.…”

Section: Discussionmentioning

confidence: 99%

Phosphate-dependent root system architecture responses to salt stress

et al. 2016

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Nutrient availability and salinity of the soil affect the growth and development of plant roots. Here, we describe how inorganic phosphate (Pi) availability affects the root system architecture (RSA) of Arabidopsis (Arabidopsis thaliana) and how Pi levels modulate responses of the root to salt stress. Pi starvation reduced main root length and increased the number of lateral roots of Arabidopsis Columbia-0 seedlings. In combination with salt, low Pi dampened the inhibiting effect of mild salt stress (75 mM) on all measured RSA components. At higher salt concentrations, the Pi deprivation response prevailed over the salt stress only for lateral root elongation. The Pi deprivation response of lateral roots appeared to be oppositely affected by abscisic acid signaling compared with the salt stress response. Natural variation in the response to the combination treatment of salt and Pi starvation within 330 Arabidopsis accessions could be grouped into four response patterns. When exposed to double stress, in general, lateral roots prioritized responses to salt, while the effect on main root traits was additive. Interestingly, these patterns were not identical for all accessions studied, and multiple strategies to integrate the signals from Pi deprivation and salinity were identified. By genome-wide association mapping, 12 genomic loci were identified as putative factors integrating responses to salt stress and Pi starvation. From our experiments, we conclude that Pi starvation interferes with salt responses mainly at the level of lateral roots and that large natural variation exists in the available genetic repertoire of accessions to handle the combination of stresses.

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“…It is possible that certain stress combinations cancel each other out, whereas combinations of others can be devastating for plant performance and yield. However, this cannot be predicted from knowledge of the single stresses alone: gene expression studies indicate that combining the stresses due to salt, mannitol, and heat treatments induces unique gene expression patterns that cannot be simply inferred from those induced by the individual stresses (Sewelam et al, 2014). Another study compared transcriptome changes in 10 Arabidopsis ecotypes in response to cold, heat, high light, salt, and flagellin treatments, as well as combinations of these stresses.…”

Section: Future Perspectivesmentioning

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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A step towards understanding plant responses to multiple environmental stresses: a genome‐wide study

Cited by 120 publications

References 54 publications

Unique Physiological and Transcriptional Shifts under Combinations of Salinity, Drought, and Heat

Unique Physiological and Transcriptional Shifts under Combinations of Salinity, Drought, and Heat

Phosphate-dependent root system architecture responses to salt stress

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

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