Resposta fotossintética de Guadua angustifolia Kunth e Bambusa vulgaris Schrad. ex-J.C. Wendl. em diferentes intensidades de luz
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Resumo
Estudos da resposta fotossintética a diversas intensidades luminosas facilitam o entendimento da fisiologia vegetal, otimizam o manejo e o uso sustentável das espécies. O objetivo da pesquisa foi avaliar a resposta fotossintética de G. angustifolia e B. vulgaris a diferentes intensidades luminosas. As medidas de assimilação fotossintética foram realizadas utilizando um sistema portátil iFL - LCpro-SD. O ponto de compensação (% U ) foi determinado usando três curvas A/Ci sob três níveis diferentes de intensidade de luz. A avaliação da resposta fotossintética ao aumento da intensidade luminosa foi de 25 a 1800 PPFD µmol m-2s-1. G. angustifolia apresentou % U de 73,9 µmol CO, m{ ²s{ ¹, indicando maior eficiência na captura de carbono em concentrações mais baixas em comparação com B. vulgaris, que apresentou % U de 88,1 µmol CO, m{ ²s{ ¹. Além disso, G. angustifolia exibiu menor taxa de respiração diurna (Rd) (0,33 µmol CO, m{ ²s{ ¹), o que otimiza sua eficiência energética, enquanto B. vulgaris apresentou maior Rd (1,08 µmol CO, m{ ²s{ ¹), o que implica maior consumo de energia em condições de baixa intensidade luminosa. G. angustifolia não apresentou fotoinibição, pois sua taxa de assimilação fotossintética aumentou continuamente com a luz. Em contraste, B. vulgaris experimentou fotoinibição de 700 µmol m{ ²s{ ¹ PPFD. Essas descobertas mostram que G. angustifolia está melhor adaptada para capturar carbono em condições de baixas concentrações de CO, e altas intensidades luminosas, enquanto B. vulgaris parece se adaptar melhor a ambientes com maiores concentrações de CO.
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