Efeito do estresse hídrico nas trocas gasosas foliares, quenching não-fotoquímico e no rendimento quântico do PSII de diferentes genótipos de milho-pipoca inoculado com Bacillus cereus
Efeito do estresse hídrico nas trocas gasosas foliares, quenching não-fotoquímico e no rendimento quântico do PSII de diferentes genótipos de milho-pipoca inoculado com Bacillus cereus
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DOI: https://doi.org/10.22533/at.ed.946112621014
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Palavras-chave: déficit hídrico, trocas gasosas, rizobactérias, Zea mays L. var. everta
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Keywords: water deficit, gas exchange, rhizobacteria, Zea mays L. var. everta
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Abstract: Water stress is the main limiting factor for crop productivity worldwide, causing substantial losses in agricultural production. Drought affects plant water potential and turgor, interfering with physiological processes and altering plant functional traits. In this context, the search for technologies that enhance plant adaptation and resilience has become critically important. Given this scenario, studies involving plant growth–promoting bacteria have gained considerable attention, as they represent a sustainable practice capable of providing multiple benefits to plants. Therefore, the objective of this study was to analyze the potential beneficial effects on the physiology of different popcorn maize genotypes resulting from their interaction with the bacterium Bacillus cereus under water stress conditions. The genotypes were grown under greenhouse conditions and inoculated with the rhizobacterium B. cereus under water deficit (WS), with stress imposed 24 days after emergence until plants reached 40% of field capacity (FC). Two popcorn maize inbred lines (L61 and L76) and their hybrid (UENF WS01) were evaluated. The experiment followed a randomized complete block design arranged in a triple factorial scheme, combining water conditions, genotypes, and inoculation type (control and inoculated), with three replications. Treatments were conducted in PVC tubes containing a substrate composed of 70% Basaplant and 30% perlite, and inoculated treatments received 1 mL of B. cereus. The results showed that, in the hybrid UENF WS01, inoculation improved several physiological parameters, including transpiration rate, internal CO₂ concentration, and stomatal conductance. In conclusion, the use of hybrids associated with Bacillus cereus inoculation has the potential to mitigate the effects of drought-induced water stress.
- Monique de Souza Santos
- Antônio Teixeira do Amaral Junior
- Gabriella Rodrigues Gonçalves
- Uéliton Alves de Oliveira
- Valter Jário de Lima
- Talles de Oliveira Santos
- Flávia Nicácio Viana
- Danielle Leal Lamêgo
- Samuel Pereira da Silva
- Jardel da Silva Figueiredo