Rizobios aislados de leguminosas forrajeras de un ecosistema ganadero árido de Holguín, Cuba. Tolerancia a estrés abiótico y producción de catalasa (Fase II)
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Abstract
triflorum), the rest grew at pH 4, and 9 of them at pH 10. All isolates grew in 0.4 % NaCl, but only one (D. triflorum) grew in 1.2 %. There was no growth in 2.4 % NaCl. All isolates reacted positively to H2O2. It was concluded that there were isolates tolerant to different stressing abiotic factors, as well as with catalase production. In addition, there were isolates that, independently of the macrosymbionts from which they originated and of the morpho-cultural group to which they were circumscribed, showed
tolerance to different abiotic factors, such as acidity and alkalinity, high salt concentrations and growth at 35 ºC. All this gives them potential for future application in agricultural practice under adverse environmental conditions. Inoculation tests of grasses and legumes under stressing environmental conditions are recommended to select the isolates with the highest positive effect on these cultures.
Key words: forage legumes, Bradyrhizobium, abiotic stress,
catalase
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