HIPÓTESE
Mudas de cajueiro na presença de alta pressão de CO2 e salinidade apresentam maior
fotossíntese, menores danos no sistema fotoquímico e, como consequência maior proteção oxidativa.
OBJETIVOS
OBJETIVO GERAL
Investigar o sistema fotossintético e o metabolismo oxidativo em folhas de plantas de cajueiro submetidas aos efeitos do estresse salino quando cultivadas em elevado CO2, a fim de
compreender respostas desencadeadas pela maior disponibilidade de CO2 as plantas e,
estabelecer relações entre a assimilação fotossintética e alterações oxidativas.
OBJETIVOS ESPECÍFICOS:
1) Avaliar os efeitos isolados e combinados do CO2 elevado e da salinidade sobre
variáveis fisiológicas relacionadas à condutância estomática, taxa fotossintética e, variáveis de fluorescência da clorofila a em folhas de mudas de cajueiro.
2) Analisar alterações oxidativas causadas pelos efeitos isolados e combinados do CO2
elevado e salinidade sobre a peroxidação lipídica (TBARS), acúmulo de peróxido de hidrogênio, e alterações na relação Na+/K+.
3) Avaliar conteúdo de pigmentos fotossintéticos (Clorofila total), pigmentos relacionados a proteção oxidativa (Flavonóides e Antocianinas) , o teor de aminoácidos e de prolina como indicativos de estresse frente aos efeitos isolados e combinados do CO2 elevado e salinidade em folhas de cajueiro.
4) Estimar o papel exercido pelo acumulo de carboidratos solúveis, sacarose e amido induzidos pelos efeitos isolados, e combinados, do alto CO2 e da salinidade na
atividade fotossintética.
5) Avaliar o metabolismo fotorrespiratório, estimando-o pela atividade e produtos de enzimas relacionadas com esta via: Oxidase do Glicolato, Glioxilato, Sintetase da Glutamina e Amônio;
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