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Cinco genótipos de amendoim de diferentes hábitos de crescimento foram submetidos a estresse hídrico moderado durante 7 dias em casa de vegetação. O plantio foi feito em vasos de 15 litros contendo solo e substrato (Plantmax®), otimizados para a cultura. O delineamento experimental adotado foi inteiramente casualizado, com esquema bi-fatorial 5 × 2 (5 genótipos × 2 tratamentos hídricos), com cinco repetições. As atividades enzimáticas da SOD, CAT, APX e GPX foram analisadas, além do acúmulo de carboidratos, amido e prolina. Em função do déficit hídrico submetido, verificou-se aumento nas atividades da SOD e da CAT em todos os genótipos, tanto nas folhas quanto na raiz, destacando-se as cv. 55 437 e BR 1 e a linhagem LBM Branco. O acúmulo de prolina e redução do teor de amido foram verificados em todos os genótipos, em resposta ao déficit hídrico, porém o teor de carboidratos foi elevado só nos materiais mais tolerantes. Em função das respostas obtidas, destacam-se como materiais mais tolerantes as cultivares 55 437 e BR 1, seguidas por LBM Branco. LBR Branco tem comportamento intermediário e LViPE 06 é o material mais sensível. Five peanut genotypes, with different growth habits were submitted to moderate water stress in a greenhouse for seven days. Seeds were planted in 15-litre pots containing soil and a substrate (Plantmax®), both optimized for the crop. The adopted experimental design was completely randomized, using a 5 x 2 bi-factorial scheme(5 genotypes × 2 water treatments) with five replications. The enzymatic activities of SOD, CAT, APX and GPX were analyzed, as well as the carbohydrate, starch and proline. An increased activity was shown in SOD and CAT enzymes for all genotypes submitted to water stress, in both leaf and root, especially in the 55 437 and BR1 cultivars and also in LBM Branco line. Proline accumulation and reduced starch were verified in all stressed genotypes, but carbohydrate content was increased just in tolerant materials. Based on results, 55 437 and BR1 were more tolerant to water stress, followed by LBM Branco. The LBR Branco shows intermediate behavior and LViPE- 06 was more sensitive

Mudanças bioquímicas em genótipos de amendoim submetidos a déficit hídrico moderado