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Vita 3 and Vita 5 are two Vigna unguiculata cultivars that differ in their capacities for survival in saline environments; Vita 3 is more tolerant and Vita 5 more sensitive. Both cultivars were submitted to salt stress with 0.1 M NaCl. After 8 days, root and shoot growth from both cultivars was reduced but reduction was more pronounced in Vita 5. Furthermore, leaf area was also reduced in this cultivar. Chlorophyll content and chlorophyll fluorescence parameters were not affected by salt stress, but the specific activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) decreased in Vita 3 and increased in Vita 5. The use of immunological techniques also revealed that the Rubisco content from Vita 3 decreased while that of Vita 5 increased. The discussion of these results is aimed at reaching a better understanding of the differences between these cultivars in relation to salt stress. Vita 3 e Vita 5 são cultivares de Vigna unguiculata que diferem na capacidade de sobrevivência em ambiente salino: Vita 3 é mais tolerante e, Vita 5, mais suscetível. Ambas as cultivares foram submetidas a um tratamento salino com NaCl 0,1 M. Após 8 dias da germinação, o crescimento das raízes e das partes aéreas foram reduzidas, sendo a redução mais acentuada na cultivar Vita 5. Além do mais, houve uma diminuição na sua área foliar. Os conteúdos de clorofila, bem como seus parâmetros de fluorescência não foram afetados pelo estresse salino, mas as atividades da ribulose-1,5-bisfosfato carboxilase/oxigenase (Rubisco) diminuiu na Vita 3 e aumentou na Vita 5. Uma abordagem imunológica mostrou que o conteúdo da proteína Rubisco diminuiu para a cultivar Vita 3 e aumentou para a cultivar Vita 5. Esses resultados são discutidos para obter melhor entendimento das diferenças entre essas cultivares em relação ao estresse salino

Differential responses of ribulose-1,5-bisphosphate carboxylase/oxygenase activities of two Vigna unguiculata cultivars to salt stress