Efeito do estresse hídrico sobre os pigmentos foliares e a densidade estomática em diferentes genótipos de milho-pipoca inoculados com Bacillus cereus
Efeito do estresse hídrico sobre os pigmentos foliares e a densidade estomática em diferentes genótipos de milho-pipoca inoculados com Bacillus cereus
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DOI: https://doi.org/10.22533/at.ed.946112621015
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Palavras-chave: déficit hídrico, pigmentos foliares, rizobactérias, Zea mays L. var. everta
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Keywords: water deficit, leaf pigments, rhizobacteria, Zea mays L. var. everta
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Abstract: This study addresses the increasing threat of drought to agricultural crops, with a focus on the impact of water stress on popcorn maize cultivation. Although adapted cultivars have been developed, strategies such as inoculation with Bacillus cereus are being explored to enhance plant resilience to abiotic stress. The objective of this study was to evaluate the potential benefits of the interaction with B. cereus on leaf pigments and stomatal density in different popcorn maize genotypes under water stress. The genotypes were grown under greenhouse conditions and inoculated with the rhizobacterium B. cereus UENF LMS 71 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. Simple factorial analysis of variance and Tukey’s test at the 5% probability level were performed. The results demonstrated that inoculation increased chlorophyll content by 19,5% in L76 and by 22,5% in the hybrid, as well as the nitrogen balance index by 39,8%, 42,5%, and 26,5% in L61, L76, and the hybrid, respectively. However, inoculation reduced flavonoid content by 20,2% in L61, 19,5% in L76, and 22,5% in the hybrid, and anthocyanin content by 159%, 91,6%, and 7,88% in L61, L76, and the hybrid, respectively. These results indicate that Bacillus cereus has the potential to mitigate water stress in popcorn maize and to contribute to plant breeding efforts aimed at identifying more tolerant and efficient genotypes under water-limited conditions.
- 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