Photosynthetic characteristics and quality of five passion fruit varieties under field conditions |
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Authors: | Vinícius Novo Gama Joilton Tavares Cunha Inorbet de Melo Lima Marcos Antonio Bacarin Diolina Moura Silva |
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Affiliation: | 1. Núcleo de Estudos da Fotossíntese, Programa de Pós-Gradua??o em Biologia Vegetal, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, no 514, Campus Universitário de Goiabeiras, Vitoria, ES, 29075-910, Brazil 2. Instituto Capixaba de Pesquisa, Extens?o Rural e Assistência Técnica (INCAPER), Linhares, ES, Brazil 3. Depto. Botanica, Laboratório de Metabolismo Vegetal, Instituto de Biologia, Universidade Federal de Pelotas, Campus Universitário, Cap?o do Le?o, RS, 96160-000, Brazil
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Abstract: | Due to photosynthetic mechanisms respond very quickly to most stressors and due to strong concerns regarding the impact of climate change on future plant productivity, the purpose of this study was to perform a comparative analysis of in vivo photosynthetic efficiencies and fruit quality of five cultivars of passion fruit (Passiflora edulis Sims. f. flavicarpa Degener). The experiments were conducted in the northern region of Espírito Santo State using cultivars FB 200, FB 300, BRS Gigante Amarelo, BRS Sol do Cerrado, and BRS Ouro Vermelho. Analyses were performed 6 months after planting, when the plants were beginning reproduction and were repeated two times during the next 4 months until fruit ripening. Chlorophyll a fluorescence transient, total chlorophyll content, and gas exchange were measured in the leaves. Physical and chemical fruit attributes were also assessed. The lowest fluorescence rates were identified in the FB 300, BRS Sol do Cerrado, and BRS Ouro Vermelho cultivars, which exhibited better capacities for quinone A (QA) reoxidation and better electron transfer efficiencies from Photosystem II to Photosystem I acceptors. Better photochemical performances (PItotal) and CO2 assimilations (A) resulted in higher fruit pulp yields, demonstrating the superior quality of the FB 300, BRS Sol do Cerrado, and BRS Ouro Vermelho cultivars. |
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