The role of organic and inorganic solutes in the osmotic adjustment of drought-stressed Jatropha curcas plants |
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| Affiliation: | 1. Laboratório de Metabolismo de Plantas, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, CP 6004, CEP 60451-970, Fortaleza, Ceará, Brazil;2. Universidade Federal de Campina Grande, Brazil;1. Department of Biochemistry and Molecular Biology, Federal University of Ceara, Brazil;2. Proteomics Analysis and Biochemical Center, Catholic University of Brasilia, Brasilia, Brazil;3. S-Inova Biotech, Catholic University Dom Bosco, Campo Grande, MS, Brazil;1. Programa de Pós-graduação em Ciências Naturais (PPGCN), Universidade do Estado do Rio Grande do Norte (UERN), Rua Professor Antônio Campos, s/n, CEP: 59600-000, Mossoró-RN, Brazil;2. Departamento de Ciências Biológicas, Faculdade de Ciências Exatas e Naturais (FANAT), Universidade do Estado do Rio Grande do Norte (UERN), Brazil;3. Departamento de Química, Faculdade de Ciências Exatas e Naturais (FANAT), Universidade do Estado do Rio Grande do Norte (UERN), Brazil;1. Arid Land and Oasis Cropping Laboratory, Institute of Arid Land, Route Eljorf, 4119 Medenine. Tunisia;2. Departamento de Bioquímica, Biología Celular y Molecular de Plantas, Estacion Experimental del Zaidín, Consejo Superior de Investigaciones Cientıfícas, 18008 Granada 18008, Spain;1. CREAF, Cerdanyola del Vallès, 08193, Spain;2. Departament d’Ecologia, Universitat de Barcelona (UB), 08028 Barcelona, Spain |
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| Abstract: | This study aimed to assess the accumulation of organic and inorganic solutes and their relative contribution to osmotic adjustment in roots and leaves of Jatropha curcas subjected to different water deficit intensity. Plants were grown in vermiculite 50% (control), 40%, 30%, 20% and 10% expressed in gravimetric water content. The water potential, osmotic potential and turgor potential of leaves decreased progressively in parallel to CO2 photosynthetic assimilation, transpiration and stomatal conductance, as the water deficit increased. However, the relative water content, succulence and water content in the leaves did not show differences between the control and stressed plants, indicating osmotic adjustment associated with an efficient mechanisms to prevent water loss by transpiration through stomatal closure. The K+ ions had greater quantitative participation in the osmotic adjustment in both leaves and roots followed by Na+ and Cl−, while the NO3− ion only showed minor involvement. Of the organic solutes studied, the total soluble sugars showed the highest relative contribution to the osmotic adjustment in both organs and its concentration positively increased with more severe water deficit. The free amino acids and glycinebetaine also effectively contributed to the osmotic potential reduction of both the root and leaves. The role of proline was quantitatively insignificant in terms of osmotic adjustment, in both the control and stressed roots and leaves. Our data reveal that roots and leaves of J. curcas young plants display osmotic adjustment in response to drought stress linked with mechanisms to prevent water loss by transpiration by means of the participation of inorganic and organic solutes and stomatal closure. Of all the solutes studied, soluble sugars uniquely display a prominent drought-induced synthesis and/or accumulation in both roots and leaves. |
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