Looking for a common bean ideotype with high photosynthesis and water-use efficiency under light fluctuation

Autor(es)

Almeida, Rafael L. ; Silveira, Neidiquele M. ; Miranda, Marcela T. ; Chiorato, Alisson F. ; Carbonell, Sergio A. M. ; Machado, Eduardo C. ; Ribeiro, Rafael, V

• Tipo de documento: Artigo Científico
• Fonte: Plant Physiology and Biochemistry; v. 229, p. 13-pg., 2025-12-01.

Resumo

High crop yield is needed to feed the global population but limiting environmental conditions constrain food production. Since high photosynthesis and water-use efficiency are two key traits for crop yield in a changing world, we aimed to evaluate the photosynthetic performance and stomatal dynamics of twenty-six common bean genotypes under fluctuating light. Leaf gas exchange and chlorophyll fluorescence were evaluated on the middle leaflet of the first fully expanded leaf during high-low-high light transitions. Photosynthetic response curves to increasing light were also performed and key photosynthetic traits estimated. Seventeen physiological traits explained 94.5 % of the variation among common bean genotypes. Significant variability for photosynthesis, stomatal conductance and water-use efficiency was observed both during light fluctuation and under light saturation. TAA Dama, ANFC9, IAC Veloz and IPR Urutau presented the highest photosynthetic capacity to increasing light availability. Furthermore, IAC Sintonia, IAC2156 and IAC2157 were the most water-use efficient cultivars, due to their stomatal sluggishness and asynchronous behaviour between stomatal conductance and photosynthesis. The genetic diversity for photosynthesis and stomatal conductance found in this study provides the basis for breeding and illustrates the potential of exploiting natural variation for increasing photosynthesis and yield while optimizing water-use efficiency. (AU)

• Processo FAPESP: 18/09834-5 - Vulnerabilidade ao embolismo em espécies cítricas: características hidráulicas, variação sazonal e relações entre copa e porta-enxerto
• Beneficiário: Marcela Trevenzoli Miranda
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 23/13662-3 - Desvendando o papel do óxido nítrico na tolerância à seca em plantas de citros
• Beneficiário: Neidiquele Maria Silveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular