Chloride: a beneficial macronutrient in plants, biological functions and regulation
In the agronomic context, chloride (Cl) has been generally considered a toxic anion rather than a plant nutrient (Colmenero-Flores et al, 2007; Brumós et al, 2009; Brumós et al, 2010). However, we have recently shown that in addition to an essential micronutrient, chloride is a beneficial macronutrient (Franco-Navarro et al, 2016). Under non-saline conditions Clspecifically stimulates higher leaf cell size and leads to a moderate increase of plant fresh and dry biomass mainly due to higher shoot expansion. Clplays specific roles in regulating leaf osmotic potential and turgor, allowing plants to improve leaf water balance parameters. In addition, Clregulates water relations at the whole plant level through reduction of plant transpiration. This is a consequence of a lower stomatal conductance, which results in lower water loss and greater photosynthetic and integrated water-use efficiency (Franco-Navarro et al, 2016). The following open questions about chloride accumulation at macronutrient levels will be addressed: i) does Climprove resistance to water deficit?; ii) why Cl- mediated reduction of stomatal conductance does not result in reduction of net photosynthetic rate?; iii) why nitrate assimilation is not adversely affected?; iv) How is Claccumulation and Cl/NO3 - interaction regulated at the molecular level? We propose that the abundant uptake and accumulation of Clresponds to adaptive functions improving water homeostasis, drought tolerance, and nitrate- and Carbon-use efficiency in plants. In addition, molecular mechanisms regulating the distribution of Clbetween root and shoot according to changing environmental conditions will be proposed. Brumos, J., J.M. Colmenero-Flores, A. Conesa, P. Izquierdo, G. Sanchez, D.J. Iglesias, M.F. Lopez-Climent, A. Gomez-Cadenas, and M. Talon. 2009. Membrane transporters and carbon metabolism implicated in chloride homeostasis differentiate salt stress responses in tolerant and sensitive Citrus rootstocks. Functional & Integrative Genomics 9:293-309. Brumós, J., M. Talón, Bouhlal, R. and J.M. Colmenero-Flores. 2010. Cl- homeostasis in includer and excluder citrus rootstocks: transport mechanisms and identification of candidate genes. Plant, Cell & Environment 33:2012-2027. Colmenero-Flores, J.M., G. Martinez, G. Gamba, N. Vazquez, D.J. Iglesias, J. Brumos, and M. Talon. 2007. Identification and functional characterization of cation-chloride cotransporters in plants. The Plant Journal 50:278-292. Franco-Navarro, J.D., J. Brumós, M.A. Rosales, P. Cubero, M. Talón, and J.M. Colmenero-Flores. 2016. Chloride regulates leaf cell size and water relations in tobacco plants. Journal of Experimental Botany. 67:873-891.
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| Format: | comunicación de congreso biblioteca |
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Institut national de la recherche agronomique (France)
2016-06-23
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| Online Access: | http://hdl.handle.net/10261/160523 |
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