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Centro de Investigaciones Biológicas del Noroeste (CIBNOR) 2014

Evaluación de la respuesta de albahaca (Ocimum basilicum l.) cv. Nuffar al estrés salino en dos cultivos hidropónicos orgánicos

Larrinaga Arce, Juan Ángel

Titre : Evaluación de la respuesta de albahaca (Ocimum basilicum l.) cv. Nuffar al estrés salino en dos cultivos hidropónicos orgánicos

Auteur : Larrinaga Arce, Juan Ángel

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

Grade : Maestría en Ciencias en el Uso, Manejo y Preservación de los Recursos Naturales 2014

Résumé
In arid and semi-arid regions salinity is an abiotic factor that causes reduction in crop growth and production. Due to this problem and low water availability there is a need to implement hydroponic techniques using brackish or desalinated water for agriculture. The objective of this study was to assess basil (Ocimum basilicum L. cv. Nuffar), which is considered as the most profitable organic farming in Baja California Sur, in two hydroponic systems with organic sources and analyze its growth under salinity conditions. Basil plants were exposed to four sodium chloride concentration (NaCl 0, 25, 50, and 100 mM) in two hydroponic cultivation systems (sand drip irrigation and root floating systems) in two time periods (15 and 45 days). Relative growth rate (RGR), net assimilation rate (NAR), leaf index area (LAI), photosynthetic activity, stomatal conductance, and transpiration were significantly higher in the root floating system compared to the sand drip system. Water potential was less at 100 mM in both systems. Sodium (Na+) in plants in the root floating system was significantly higher (p<0.05) after 45 days while potassium (K+), calcium (Ca2+), magnesium (Mg2+), and manganese (Mn2+) content decreased in leaf, stem, and root. The superoxide dismutase activity (SOD, E.C. 1.15.1.1) in leaves was higher in the sand drip system than floating root systems (p<0.05). No significant differences were observed in both periods (15 and 45 days) in either of the systems. Catalase activity (CAT, E.C. 1.11.1.6) at 100 mM was higher in the root floating system than in the sand drip system (p<0.05). Peroxidase activity (APX, E.C. 1.11.1.11) was significantly higher at 50 mM in the root floating system (p<0.05) while in the sand drip system it was higher at 100 mM (p<0.05). In conclusion, the antioxidant system of basil was able to mitigate the effect of free radicals caused by saline stress at 50 mM of NaCl defining this concentration as the tolerance peak to avoid oxidative damage in the sand drip and root floating systems. Based on the results of this study we suggest that the root floating system is a good choice for the production of commercially basil.

Mots Clés : Albahaca ; hidroponía ; salinidad

Présentation -> http://dspace.cibnor.mx:8080/handle...

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Page publiée le 25 novembre 2017, mise à jour le 26 décembre 2019