Efeito do estresse hídrico na heterose de diferentes genótipos de milho-pipoca inoculado com Bacillus cereus
Efeito do estresse hídrico na heterose de diferentes genótipos de milho-pipoca inoculado com Bacillus cereus
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DOI: https://doi.org/10.22533/at.ed.946112621013
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Palavras-chave: déficit hídrico, heterose, rizobactérias, Zea mays L. var. everta
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Keywords: water deficit, heterosis, rhizobacteria, Zea mays L. var. everta
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Abstract: Popcorn maize is highly sensitive to drought, and plant breeding combined with the inoculation of plant growth–promoting bacteria represents a viable strategy to mitigate the effects of soil water limitation. In this context, the objective of this study was to evaluate heterosis for morphophysiological traits in different popcorn maize genotypes grown under greenhouse conditions and inoculated with the rhizobacterium Bacillus cereus under water deficit (WS). Water stress was 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 was conducted in 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 carried out in PVC tubes containing a substrate composed of 70% Basaplant and 30% perlite, and inoculated treatments received 1 mL of Bacillus cereus. Heterosis was calculated based on the mid-parent mean, and heterobeltiosis was estimated relative to the best parent. The results showed that under control conditions, most morphological traits and leaf pigment parameters exhibited greater expression of heterosis, except for plant height, root dry mass, chlorophyll, flavonoids, and non-photochemical quenching, which showed greater heterobeltiosis. Gas exchange traits showed higher heterosis expression, except for the quantum yield of PSII, which exhibited greater heterobeltiosis. Under inoculated conditions, greater heterosis expression was observed for most traits, except for nitrogen balance and the quantum yield of photosystem II, which showed higher heterobeltiosis. In conclusion, the hybrid was superior to its parental lines, and when associated with Bacillus cereus inoculation, it showed potential to mitigate the effects of drought-induced water stress.
- Monique de Souza Santos
- Antônio Teixeira do Amaral Júnior
- Gabriella Rodrigues Gonçalves
- Uéliton Alves de Oliveira
- Samuel Henrique Kamphorst
- Valter Jário de Lima
- Talles de Oliveira Santos
- Flávia Nicácio Viana
- Danielle Leal Lamêgo
- Samuel Pereira da Silva
- Jardel da Silva Figueiredo