Chloride on the Move

Li, Bo; Tester, Mark; Gilliham, Matthew

doi:10.1016/j.tplants.2016.12.004

Cited by 165 publications

(153 citation statements)

References 106 publications

(201 reference statements)

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“…chloride) uptake under saline conditions (Fig. c, see also Li et al ., , for review). Future studies are required to show whether there is also a more direct and faster regulation of the SLAH1/SLAH3 heteromer activity than the currently known and rather slow transcriptional control.…”

Section: Anion Channels In Shoot and Rootmentioning

confidence: 99%

Biology of SLAC1‐type anion channels – from nutrient uptake to stomatal closure

2017

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Contents 46I.46II.47III.50IV.53V.56VI.575858References58 Summary Stomatal guard cells control leaf CO2 intake and concomitant water loss to the atmosphere. When photosynthetic CO2 assimilation is limited and the ratio of CO2 intake to transpiration becomes suboptimal, guard cells, sensing the rise in CO2 concentration in the substomatal cavity, deflate and the stomata close. Screens for mutants that do not close in response to experimentally imposed high CO2 atmospheres identified the guard cell‐expressed Slowly activating anion channel, SLAC1, as the key player in the regulation of stomatal closure. SLAC1 evolved, though, before the emergence of guard cells. In Arabidopsis, SLAC1 is the founder member of a family of anion channels, which comprises four homologues. SLAC1 and SLAH3 mediate chloride and nitrate transport in guard cells, while SLAH1, SLAH2 and SLAH3 are engaged in root nitrate and chloride acquisition, and anion translocation to the shoot. The signal transduction pathways involved in CO2, water stress and nutrient‐sensing activate SLAC/SLAH via distinct protein kinase/phosphatase pairs. In this review, we discuss the role that SLAC/SLAH channels play in guard cell closure, on the one hand, and in the root–shoot continuum on the other, along with the molecular basis of the channels’ anion selectivity and gating.

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Section: Anion Channels In Shoot and Rootmentioning

confidence: 99%

Biology of SLAC1‐type anion channels – from nutrient uptake to stomatal closure

2017

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“…In this way, a larger reduction of DM occurred in the tissues with higher Cl -accumulation (leaves and stems) and, as the smallest DM reduction was in the root, where there was less accumulation of DM. The Cl -is a predominant anion under saline conditions (Tavakkoli, Rengasamy, & McDonald, 2010), when absorbed by the roots is easily translocated to the tissues of the aerial part (Li, Tester, & Gilliham, 2017), justifying its large accumulation in leaves and roots.…”

Section: Assay Imentioning

confidence: 99%

Tolerance of Basil Genotypes to Salinity

Menezes¹,

Neto²,

Gheyi³

et al. 2017

JAS

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Basil (Ocimum basilicum L.) is a medicinal species of Lamiaceae family, popularly known for its multiple benefits and high levels of volatile compounds. The species is considered to be one of the most essential oil producing plants. Also cultivated in Brazil as a condiment plant in home gardens. The objective of this study was to evaluate the effect of salinity on the growth of basil in nutrient solution of Furlani and to identify variables related to the salinity tolerance in this species. The first assay was performed with variation of five saline levels (0 -control, 20, 40, 60 and 80 mM NaCl). In the second assay six genotypes were evaluated in two salinity levels 0 and 80 mM NaCl. The height, stem diameter, number of leaves, dry mass and inorganic solutes in different organs, photosynthetic pigments, absolute membrane integrity and relative water content were evaluated. All biometric variables in basil were significantly reduced by salinity. Dry matter yield and percentage of membrane integrity were the variables that best discriminated the characteristics of salinity tolerance among the studied basil genotypes. Basil genotypes showed a differentiated tolerance among the genotypes, the 'Toscano folha de alface' being considered as the most tolerant and 'Gennaro de menta' as the most sensitive, among the species studied.

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“…Positive effects on cell size, biomass increase, osmotic regulation and WUE were specific for Cl − relative to other mineral macronutrient anions (Franco‐Navarro et al ., ). But it is still unclear how Cl − could be beneficial, especially in comparison with nitrate (NO 3 − ), which in addition to being an essential source of nitrogen, shares with Cl − similar physical and osmotic properties, as well as common transport mechanisms (Flowers, ; Cubero‐Font et al ., ; Li et al ., ; Wege et al ., ). Therefore, in this study, we aimed: (i) to confirm whether macronutrient levels of Cl − in plants reduces g s without a concomitant reduction in A N ; (ii) to identify physiological/anatomical mechanisms responsible for the observed Cl − ‐dependent g s reduction; (iii) to verify whether Cl − nutrition modifies g m and which physiological/anatomical alterations rely behind this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Chloride as a macronutrient increases water‐use efficiency by anatomically driven reduced stomatal conductance and increased mesophyll diffusion to CO₂

et al. 2019

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Summary Chloride (Cl−) has been recently described as a beneficial macronutrient, playing specific roles in promoting plant growth and water‐use efficiency (WUE). However, it is still unclear how Cl− could be beneficial, especially in comparison with nitrate (NO3−), an essential source of nitrogen that shares with Cl− similar physical and osmotic properties, as well as common transport mechanisms. In tobacco plants, macronutrient levels of Cl− specifically reduce stomatal conductance (gs) without a concomitant reduction in the net photosynthesis rate (AN). As stomata‐mediated water loss through transpiration is inherent in the need of C3 plants to capture CO2, simultaneous increase in photosynthesis and WUE is of great relevance to achieve a sustainable increase in C3 crop productivity. Our results showed that Cl−‐mediated stimulation of larger leaf cells leads to a reduction in stomatal density, which in turn reduces gs and water consumption. Conversely, Cl− improves mesophyll diffusion conductance to CO2 (gm) and photosynthetic performance due to a higher surface area of chloroplasts exposed to the intercellular airspace of mesophyll cells, possibly as a consequence of the stimulation of chloroplast biogenesis. A key finding of this study is the simultaneous improvement of AN and WUE due to macronutrient Cl− nutrition. This work identifies relevant and specific functions in which Cl− participates as a beneficial macronutrient for higher plants, uncovering a sustainable approach to improve crop yield.

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Chloride on the Move

Cited by 165 publications

References 106 publications

Biology of SLAC1‐type anion channels – from nutrient uptake to stomatal closure

Biology of SLAC1‐type anion channels – from nutrient uptake to stomatal closure

Tolerance of Basil Genotypes to Salinity

Chloride as a macronutrient increases water‐use efficiency by anatomically driven reduced stomatal conductance and increased mesophyll diffusion to CO₂

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Chloride on the Move

Cited by 165 publications

References 106 publications

Biology of SLAC1‐type anion channels – from nutrient uptake to stomatal closure

Biology of SLAC1‐type anion channels – from nutrient uptake to stomatal closure

Tolerance of Basil Genotypes to Salinity

Chloride as a macronutrient increases water‐use efficiency by anatomically driven reduced stomatal conductance and increased mesophyll diffusion to CO2

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Chloride as a macronutrient increases water‐use efficiency by anatomically driven reduced stomatal conductance and increased mesophyll diffusion to CO₂