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Accueil du site → Doctorat → Mexique → Respuesta fisiología y bioquímica de Jatropha curcas y Jatropha cinerea bajo estrés por salinidad

Centro de Investigaciones Biológicas del Noroeste (CIBNOR) 2013

Respuesta fisiología y bioquímica de Jatropha curcas y Jatropha cinerea bajo estrés por salinidad

Hishida, Masako

Titre : Respuesta fisiología y bioquímica de Jatropha curcas y Jatropha cinerea bajo estrés por salinidad

Auteur : Hishida, Masako

Etablissement de soutenance : Centro de Investigaciones Biológicas del Noroeste (CIBNOR)

Grade : Doctorado en Ciencias en el Uso, Manejo y Preservación de los Recursos Naturales 2013

Résumé
Jatropha curcas is a tropical succulent plant native to Mexico and one of the most important biodiesel crops resistant to drought stress. However, responses to salinity that limit much of biomass production in arid and semi-arid regions have not been clarified enough to assess its capacity as an alternative plant in saline affected soil. Therefore, we evaluated the responses to salt stress on J. curcas, comparing with those of J. cinerea, a wild species of arid areas. At first, the two Jatropha species were subjected to salinity treatments (0 200 mM of NaCl), and the salinity effects on growth, physiology, ion contents, and biochemistry were measured at germination and seedling stage. Then, the two species were subjected to 0 100 mM of NaCl, and 4 and 8 mM of nitrogen treatment. The nutritional characteristics and nitrogen fertilization effects on growth, ion contents, and physiology under salinity stress were studied. Finally, we clarified the effect of salinity stress on growth, ion contents, physiology, biochemistry, and seed production at this stage using ground water (EC=1.9 6.1). Germination of the two Jatropha was inhibited over 50 mM of NaCl. J. curcas could germinate up to 50 mM and J. cinerea at 100 mM. Germination stage was the most sensitive to salinity during all of life stages in both species. In seedling stage, biomass production decreased mostly due to Na+ and Cl- accumulation. Growth reduction in J. curcas was greater than in J. cinerea because of higher salt accumulation in leaves. Both Jatropha showed different characteristics in nutrient absorption ; total nitrogen and NO3 - concentration was higher in J. curcas and Na+ and Cl- in J. cinerea in control. Under salinity stress, an increment of nitrogen fertilization contributed to increase biomass production by the decrease of Na+ absorption and alleviation of cation imbalance in J. curcas. Moreover, membrane stability improved in both species. In seed production stage, plant height and stem width decreased by salinity stress. However, seed production was not affected because Na+ and Cl- concentration in leaves could not reach the toxicity level in both species. Therefore, cultivation of J. curcas can be viable for bioenergy using saline affected land and salty water.

Mots Clés : estrés por salinidad ; Jatropha cinerea ; Jatropha curcas

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Page publiée le 14 octobre 2017