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Rodrigues MGF, Firmino AC, Valentim JJ, Pavan BE, Ferreira AFA, Monteiro LNH, Ramos ES, Soutello RVG. Correlation of genome methylation of fig tree accessions with natural nematode and rust incidence. BRAZ J BIOL 2024; 84:e263041. [DOI: 10.1590/1519-6984.263041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 06/24/2022] [Indexed: 11/22/2022] Open
Abstract
Abstract Commercial fig tree cultivation in Brazil involves a single cultivar, ‘Roxo-de-Valinhos’. The use of a single cultivar results in serious diseases and related problems. The aim of this study was to characterize fig accessions by analyzing the natural root-knot nematode and leaf rust incidence in relation to the epigenomic profile of the plant, since epigenetic variations affect plant–pathogen interactions. All plants were attacked by nematodes, indicating susceptibility; Meloidogyne incognita was the root-knot nematode species involved. Joint analysis of data showed that methylation and leaf rust incidence were correlated when observed in the same phenological phase, presenting initial evidence of the same factorial pressure loads in genotypes, suggesting similar behavior within these genotypes.
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Affiliation(s)
| | - A. C. Firmino
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brasil
| | - J. J. Valentim
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brasil
| | - B. E. Pavan
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brasil
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Santos TP, Sá ME, Malagutti ES, Pinto MS, Ferreira AFA, Monteiro LNH, Silva ACC, Soutello RVG, Rodrigues MGF. Effects of gibberellic acid concentration and fruit maturation stage on seed germination and vigor of pitahaya seedlings. BRAZ J BIOL 2024; 84:e260650. [DOI: 10.1590/1519-6984.260650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 05/13/2022] [Indexed: 11/22/2022] Open
Abstract
Abstract With increased interest in cultivation, the study of white-fleshed pitahaya (Selenicereus undatus (Haw.) D.R. Hunt, Cactaceae family) seedling production is of fundamental importance in the search for novel techniques to increase cultivation and guarantee homogeneous and productive orchards. The present study investigated the influence of various gibberellic acid (GA3) concentrations and fruit maturation stages on seed germination and vigor of white-fleshed pitahaya seedlings, considering the physiological quality of seedlings produced to support genetic breeding and conservation programs of the species. White-fleshed pitahaya seeds at two maturation stages (physiologically ripe and maintained at 10 °C in Biochemical Oxygen Demand incubators for three months) were treated with varying GA3 concentrations of 0, 50, 100, and 500 mg/L. We observed the influence of fruit storage on seedling germination, emergence, and growth as a function of GA3 concentration. According to the results, seeds extracted from ripe white-fleshed pitahaya fruits grown under the conditions tested here required GA3 application to increase seedling emergence and vigor, with optimal doses in the 150–300-mg/L range. In the case of pitahaya fruits intended for storage for future seed removal and maintained under the same sowing conditions, the application of higher doses of GA3 was necessary when compared to the previous condition, with a minimum dose of 500 mg/L GA3. The present study shows that the maturation stage of white-fleshed pitahaya fruits intended for seed removal influences the quality of seedlings; therefore, the use of seeds extracted from ripe pitahaya fruits without fermentation is more appropriate for the purpose.
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Affiliation(s)
| | - M. E. Sá
- Universidade Estadual Paulista, Brasil
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