Na+ extrusion from the cytosol and tissue-specific Na+ sequestration in roots confer differential salt stress tolerance between durum and bread wheat

Wu, Honghong; Shabala, Lana; Azzarello, Elisa; Huang, Yuqing; Pandolfi, Camilla; Su, Nana; Wu, Qi; Cai, Shengguan; Bazihizina, Nadia; Wang, Lu; Zhou, Meixue; Mancuso, Stefano; Chen, Zhong‐Hua; Shabala, Sergey

doi:10.1093/jxb/ery194

Cited by 76 publications

(65 citation statements)

References 97 publications

(120 reference statements)

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“…Salt overly sensitive (SOS1), which encodes a PM Na + /H + antiporter, is preferentially expressed in the root tip rather than in the mature zone in Arabidopsis (Shi, Quintero, Pardo, & Zhu, ). Outside the meristem zone, wheat ( Triticum aestivum ) exhibits hypersensitivity to salt stress with significant Na + accumulation in the cytosol but not in the vacuole, which confirms that the root apex has a stronger Na + signal (Wu et al, ). Taken together, these results confirm that the root apex exhibits a strong ion flux in various species and is associated with much of the observed electrophysiology (see review by McLamore & Porterfield, ).…”

Section: Discussionmentioning

confidence: 86%

“…Root K + and Na + levels are recognized as a key determinant of plant salt tolerance (Chen, Pottosin, et al, ; Chen, Zhou, et al, ; Lang et al, ; Shabala, ; Sun, Chen, et al, ; Sun, Dai, et al, ; Tester & Davenport, ; Wu et al, ). In the present study, we found that A. nanus roots under a combination of herbivore and salt stress had a higher K + content, a lower Na + content, and a higher K + /Na + ratio than plants subjected to salt stress alone (Figure ).…”

Section: Discussionmentioning

confidence: 99%

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Herbivore exposure alters ion fluxes and improves salt tolerance in a desert shrub

Chen

Cao²,

Guo

et al. 2019

Plant Cell & Environment

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Plants have evolved complex mechanisms that allow them to withstand multiple environmental stresses, including biotic and abiotic stresses. Here, we investigated the interaction between herbivore exposure and salt stress of Ammopiptanthus nanus, a desert shrub. We found that jasmonic acid (JA) was involved in plant responses to both herbivore attack and salt stress, leading to an increased NaCl stress tolerance for herbivore‐pretreated plants and increase in K+/Na+ ratio in roots. Further evidence revealed the mechanism by which herbivore improved plant NaCl tolerance. Herbivore pretreatment reduced K+ efflux and increased Na+ efflux in plants subjected to long‐term, short‐term, or transient NaCl stress. Moreover, herbivore pretreatment promoted H+ efflux by increasing plasma membrane H+‐adenosine triphosphate (ATP)ase activity. This H+ efflux creates a transmembrane proton motive force that drives the Na+/H+ antiporter to expel excess Na+ into the external medium. In addition, high cytosolic Ca2+ was observed in the roots of herbivore‐treated plants exposed to NaCl, and this effect may be regulated by H+‐ATPase. Taken together, herbivore exposure enhances A. nanus tolerance to salt stress by activating the JA‐signalling pathway, increasing plasma membrane H+‐ATPase activity, promoting cytosolic Ca2+ accumulation, and then restricting K+ leakage and reducing Na+ accumulation in the cytosol.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Herbivore exposure alters ion fluxes and improves salt tolerance in a desert shrub

Chen

Cao²,

Guo

et al. 2019

Plant Cell & Environment

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“…It was previously shown that the root phenotype is altered in response to soil salinity (Shelden et al, 2013). Moreover, the ability for higher Na + extrusion in the root elongation zone and better vacuolar Na + sequestration in the mature root zone was found to be essential for salinity tolerance in bread wheat genotypes (Wu et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…However, a recent study has investigated salinity effects on root development at specific phytomer positions in hydroponic culture to provide a novel understanding of salinity damage in wheat roots (Robin et al, 2016). It was shown that salt stress sensor is located in the root meristem, and meristem signaling to the shoot is essential in enabling vacuolar Na + sequestration ability in leaf mesophyll cells (Wu et al, 2018). Recently, quatitative trait loci (QTLs) and markers linked with various micronutrient concentrations and salt tolerance have been identified at seedling stage in wheat (Hussain et al, 2017).…”

mentioning

confidence: 99%

Root Growth and Architecture Responses of Bread Wheat Cultivars to Salinity Stress

2019

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The screening of genotypes that perform better in saline soils is important for food security as the arable land affected by this problem is increasing. To mimic the conditions found in saline fields, a saline soil‐based screening method was developed to distinguish genetic diversity in root growth responses and shoot growth rates of bread wheat (Triticum aestivum L.) cultivars, namely Roshan, Bam, Tabbasi, Mahooti, Shiraz, Qods, Falat, and Atrak. Soil‐filled polyvinyl chloride (PVC) tubes perfused with 50 to 200 mM NaCl and a standard nutrient solution was employed. A constant salt concentration was maintained throughout the soil profile in the PVC tubes. Genetic variation in root growth and leaf Na+ concentrations was observed between cultivars in response to salinity. Salinity decreased the relative growth rate, seminal and total root length, and the distance between root tip and the first lateral root but increased total branch roots. For most traits, the growth reductions due to salinity were higher in salt‐sensitive compared with salt‐tolerant cultivars. The seminal root length was reduced more than branch root length in all cultivars. Roshan and Tabbasi were identified as the most tolerant to salinity due to their longer seminal axile roots, shorter distance from the tip, higher distal branch root numbers, and higher branch root length compared to the other cultivars. A positive relationship between genetic variations in root growth response and relative growth rate indicates that root growth might be the key factor driving shoot growth and can be used as a criterion for screening salinity tolerance. Core Ideas Genetic variation was found in root growth traits and shoot growth rate in response to soil salinity. Salinity reduced shoot growth rate, seminal and total root length, but increased branch root length. A positive relationship was found between root growth response and shoot growth rate.

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“…The results regarding Na + and Cl - ions accumulation are rather interesting. High levels of Na + and Cl - ions were detected in roots of treated plants suggesting that the roots may act as potential sink for excessive Na + and Cl - ions deposition, inhibiting their translocation to shoot and alleviate the negative effects on actively dividing and photosynthesizing cells (Baetz et al, 2016; Peng et al, 2016; Rahneshan et al, 2018; Wu et al, 2018). Intriguingly, Ca 2+ levels were also increased with increasing Na + levels in both leaves and roots of salt treated plants, which suggest that might possible trigger of vaculoar Ca 2+ reserves to ameliorate the Na + toxicity (Saleh Plieth, 2013).…”

Section: Discussionmentioning

confidence: 99%

Systematic hormone-metabolite network provides insights of high salinity tolerance inPongamia pinnata(L.) pierre

Marriboina

Sharma

Sengupta

et al. 2020

Preprint

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Salinity stress results significant losses in plant productivity, and loss of cultivable lands. Although Pongamia pinnata is reported to be a salt tolerant semiarid tree crop, the adaptive mechanisms to saline environment are elusive. The present investigation describes alterations in hormonal and metabolic responses in correlation with physiological and molecular variations in leaves and roots of Pongamia at sea salinity level (3% NaCl) for 8 days. At physiological level, salinity induced adjustments in plant morphology, leaf gas exchange and ion accumulation patterns were observed. Our study also revealed that phytohormones including JAs and ABA play crucial role in promoting the salt adaptive strategies such as apoplasmic Na+ sequestration and cell wall lignification in leaves and roots of Pongamia. Correlation studies demonstrated that hormones including ABA, JAs and SA showed a positive interaction with selective compatible metabolites (sugars, polyols and organic acids) to aid in maintaining osmotic balance and conferring salt tolerance to Pongamia. At the molecular level, our data showed that differential expression of transporter genes as well as antioxidant genes regulate the ionic and ROS homeostasis in Pongamia. Collectively, these results shed new insights on an integrated physiological, structural, molecular and metabolic adaptations conferring salinity tolerance to Pongamia.High lightOur data, for the first time, provide new insights for an integrated molecular and metabolic adaptation conferring salinity tolerance in Pongamia. The present investigation describes alterations in hormonal and metabolic responses in correlation with physiological and molecular variations in Pongamia at sea salinity level (3% NaCl) for 8 days.

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Na+ extrusion from the cytosol and tissue-specific Na+ sequestration in roots confer differential salt stress tolerance between durum and bread wheat

Abstract: Stronger Na+ extrusion and vacuolar sequestration are essential to confer better salt tolerance in bread wheat than in durum wheat. Removal of the root meristems increased salt sensitivity in wheat.

Cited by 76 publications

References 97 publications

Herbivore exposure alters ion fluxes and improves salt tolerance in a desert shrub

Herbivore exposure alters ion fluxes and improves salt tolerance in a desert shrub

Root Growth and Architecture Responses of Bread Wheat Cultivars to Salinity Stress

Systematic hormone-metabolite network provides insights of high salinity tolerance inPongamia pinnata(L.) pierre

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