Propagação de genótipos de Passiflora mucronata submetidos a estresses bióticos e abióticos
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Data
2021-02-25
Autores
Oliveira, Patrick Alves de
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Universidade Federal do Espírito Santo
Resumo
The species Passiflora mucronata Lam. has great ornamental, medicinal and genetic potential, can be used as a rootstock for commercial species, and is resistant to diseases such as bacteriosis and anthracnose. The success in the formation of seedlings depends on the knowledge about the propagation process of the plants. In sexual propagation, the stresses caused by water deficit and the presence of excess salts are highly harmful to seed germination; in asexual propagation, success depends on several factors, highlighting the standardization and quality of the cuttings used, due to the possibility of transmission of pathogens. Genotypes of P. mucronata Lam. have been suggested as resistant to soil pathogens, and may be an alternative rootstock for propagation of commercial passion fruit species. However, its stem has a smaller diameter than other species of Passifloraceae, which can hinder the grafting process. Therefore, there is a need for studies with the species. The objective was to study the seminiferous and vegetative propagation, resistance to biotic and abiotic stresses and the early rot etiology of cuttings of Passiflora mucronata Lam. Three experiments were carried out: Experiment I. Physiological quality of seeds of P. mucronata Lam genotypes. as a function of nitric oxide donor and salt stress. Four NO Tadalafil donors were studied: 0.0; 1.5; 2.5 and 5.0 mg L-1 in nine genotypes. The results showed that the G3 genotype treated with Tadalafil (1.5 mg L-1 ) had the highest germination (64%) and germination speed. The concentration of Tadalafil 5.0 mg L-1 ) reduced seed germination. Experiment II. Initial growth of clonal seedlings of Passiflora mucronata genotypes subjected to doses of Paclobutrazol (PBZ). Two genotypes (G5 and G7) and four PBZ procedures (0; 5; 10 and 15 mg plant-1 ) were studied, in which the application of PBZ promoted an increase in the diameter of plagiotropic shoots and the index of leaf area index, with increased photosynthesis and stomatal conductance. Experiment III. The etiology of P. mucronata precocious cuttings was studied. The isolation and morphological and genetic identification of the pathogen responsible for the high severity and death of P. mucronata cuttings in the cutting process was carried out. The analyzes confirmed the presence of F. incarnatum-equiseti in cuttings, making it the first report of the disease in P. mucronata in Brazil.
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Espécie silvestre , germinação , maracujá , patógeno