Enhanced root hydraulic conductance by aquaporin regulation accounts for silicon alleviated salt-induced osmotic stress in Sorghum bicolor L

Liu, Peng; Yin, Lina; Wang, Shiwen; Zhang, Meijuan; Deng, Xin; Zhang, Suiqi; Tanaka, Kiyoshi

doi:10.1016/j.envexpbot.2014.10.006

Cited by 213 publications

(158 citation statements)

References 54 publications

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“…Diogo and Wydra (2007) found that silicon-induced resistance to bacterial wilt is more effective in the resistant genotype than in the moderately resistant genotype. By and large, in this study, silicon addition increased the CsPIPs expression levels under salt stress, which is consistent with the results of Liu et al (2015). Siliconmediated increase in CsPIPs expression might have contributed to the increase of root hydraulic conductance in cucumber under salt stress.…”

Section: Discussionsupporting

confidence: 94%

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Silicon improves salt tolerance by increasing root water uptake in Cucumis sativus L.

Zhu

et al. 2015

Plant Cell Rep

146

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Silicon enhances root water uptake in salt-stressed cucumber plants through up-regulating aquaporin gene expression. Osmotic adjustment is a genotype-dependent mechanism for silicon-enhanced water uptake in plants. Silicon can alleviate salt stress in plants. However, the mechanism is still not fully understood, and the possible role of silicon in alleviating salt-induced osmotic stress and the underlying mechanism still remain to be investigated. In this study, the effects of silicon (0.3 mM) on Na accumulation, water uptake, and transport were investigated in two cucumber (Cucumis sativus L.) cultivars ('JinYou 1' and 'JinChun 5') under salt stress (75 mM NaCl). Salt stress inhibited the plant growth and photosynthesis and decreased leaf transpiration and water content, while added silicon ameliorated these negative effects. Silicon addition only slightly decreased the shoot Na levels per dry weight in 'JinYou 1' but not in 'JinChun 5' after 10 days of stress. Silicon addition reduced stress-induced decreases in root hydraulic conductivity and/or leaf-specific conductivity. Expressions of main plasma membrane aquaporin genes in roots were increased by added silicon, and the involvement of aquaporins in water uptake was supported by application of aquaporin inhibitor and restorative. Besides, silicon application decreased the root xylem osmotic potential and increased root soluble sugar levels in 'JinYou 1.' Our results suggest that silicon can improve salt tolerance of cucumber plants through enhancing root water uptake, and silicon-mediated up-regulation of aquaporin gene expression may in part contribute to the increase in water uptake. In addition, osmotic adjustment may be a genotype-dependent mechanism for silicon-enhanced water uptake in plants.

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Section: Discussionsupporting

confidence: 94%

“…Until recently, Liu et al (2015) reported that silicon pre-treatment could improve root water uptake by up-regulating the expression of plasma membrane aquaporins in one sorghum cultivar at the early stage of salt stress. However, in their study, the role of osmotic adjustment in root water uptake under salt stress was not investigated.…”

Section: Introductionmentioning

confidence: 99%

Silicon improves salt tolerance by increasing root water uptake in Cucumis sativus L.

Zhu

et al. 2015

Plant Cell Rep

146

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“…Moreover, AM symbiosis enhances symplastic water transport through regulating the aquaporin gene expression (Aroca et al 2009;Hajiboland 2013) which helps in the transport of water as well as solutes from osmotically favourable growing mycelium or host roots to salt-stressed tissues, thereby improving water and nutrient status of the plants (Hajiboland 2013;Augé et al 2014). Recently, role of Si in up-regulating the transcription of genes responsible for aquaporin activity has also been observed in Sorghum bicolor L. under salt stress (Liu et al 2015), which resulted in enhanced salt resistance. Additionally, Si helps in retaining water in plants tissues by inducing reduction in transpiration and partial blocking the transpiration bypass flow (Yeo et al 1999) which not only improves water economy of the plant, but also contributes to salt dilution effect (Gong et al 2006).…”

Section: Discussionmentioning

confidence: 94%

Silicon nutrition and mycorrhizal inoculations improve growth, nutrient status, K+/Na+ ratio and yield of Cicer arietinum L. genotypes under salinity stress

2015

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Salinity is a major abiotic stress that limits plant growth and productivity. Role of silicon (Si) nutrition and arbuscular mycorrhiza (AM) in mitigating salt stress has gained importance in recent years. Legumes are sensitive to salinity and are considered low Si-accumulators. AM have been reported to increase Si uptake in mycorrhizal plants. However, little is known about the alleviative role of Si and/ or AM in mitigating salt stress in Cicer arietinum L. (chickpea). Therefore, the present study was aimed to evaluate the individual and cumulative effect of Si and AM (Funneliformis mosseae) on nutrient status, growth and productivity of salt tolerant HC 3 and salt sensitive CSG 9505 genotypes of chickpea under salinity stress conditions. The genotypes were subjected to 0, 60, 80,100 mM NaCl and 0, 4 mM potassium silicate-K 2 SiO 3 treatments in the presence and absence of AM fungi. The results indicated that the Si and AM treatments improve the endogenous nutrients profile, growth characteristics and yield attributes under salinity stress. AM was found to be more efficient in improving growth and productivity while Si was more beneficial in improving K ? /Na ? ratio. Mycorrhization mediated significant improvement in Si uptake and as a result, Si supplementation along with mycorrhization reduced Na ? content significantly, improved growth, yield and nutrient uptake, arrested chlorophyll pigment damage and increased RUBISCO activity. HC 3 was more responsive to mycorrhization and Si nutrition than CSG 9505. The study will contribute to our understanding of Si and/or AM mediated salinity tolerance mechanism for developing chickpea genotypes resistance to salt stress.

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“…In another study, Hattori et al (2007) found that the higher stomatal conductance in silicon-supplied sorghum seedlings under water stress was attributed to increased leaf water potential due to silicon-induced enhancement of hydraulic conductance. In Sorghum plants exposed to salt stress, Liu et al (2015) found that the supply of Si alleviated osmotic stress by upregulating aquaporin genes, thereby enhancing the root hydraulic conductance. Nevertheless, in another study (Chen et al, 2011) Si application significantly increased transpiration rates in rice plants under drought stress, which suggests that the impact of Si on transpiration may be not species-specific.…”

Section: Plant Water Relationsmentioning

confidence: 98%

Biostimulant activity of silicon in horticulture

Savvas

Ntatsi

2015

Scientia Horticulturae

228

139

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Enhanced root hydraulic conductance by aquaporin regulation accounts for silicon alleviated salt-induced osmotic stress in Sorghum bicolor L

Cited by 213 publications

References 54 publications

Silicon improves salt tolerance by increasing root water uptake in Cucumis sativus L.

Silicon improves salt tolerance by increasing root water uptake in Cucumis sativus L.

Silicon nutrition and mycorrhizal inoculations improve growth, nutrient status, K+/Na+ ratio and yield of Cicer arietinum L. genotypes under salinity stress

Biostimulant activity of silicon in horticulture

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