Suficiência amostral, superação de dormência, características fisiológicas, fitoquímicas e fitormonais, óleos essenciais e mecanismos alelopáticos na propagação de Passiflora spp.
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Data
2023-02-17
Autores
Lima, Paula Aparecida Muniz de
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Universidade Federal do Espírito Santo
Resumo
Passion fruit trees have an important role in Brazilian fruit growing. For many genotypes and hybrids, however, essential information is lacking to guide the propagation process and, therefore, the success of their cultivation. The objective of this work was to study and analyze the sample sufficiency, aspects related to dormancy and physiological, phytochemical and phytohormonal characteristics of seeds, the effect of using essential oils to control fungi in seeds and allelopathic mechanisms in the propagation of Passiflora spp. For experiments on overcoming dormancy, physiological, biochemical, phytohormonal characteristics and the use of essential oils, seeds of P. mucronata genotypes were used. Essential oils in the control of fungal contamination was analyzed in yellow and purple passion fruit seeds. The following were analyzed: germination, vigor, reserve substances and hormones. For analysis of allelopathy, bark extract of P. mucronata genotypes was used on the germination and vigor of Lactuca sativa seeds. For the analysis of sample sufficiency, seeds of the passion fruit hybrid (BRS Rubi do Cerrado – BRS RC) were used. The following parameters were analyzed: germination, germination speed index, shoot and root length, dry mass of normal seedlings and the ratio of root length to shoot length. The seeds of P. mucronata show integumentary dormancy. Treatments with mechanical scarification and immersion in sulfuric acid do not overcome seed dormancy of P. mucronata genotypes. The temperatures of 60 and 70 °C overcame the dormancy of seeds of the P. mucronata genotypes and provided greater germination and vigor. Seeds of P. mucronata genotypes G3, G7 and G8 showed greater germination and vigor when submitted to treatments to overcome dormancy. Seeds of the G2 and G8 genotypes showed the highest means of germination and vigor. Seeds of P. mucronata genotypes submitted to thermotherapy treatment have lower averages of nutritional reserves. Seeds of the G6 genotype have lower averages of germination, vigor, nutritional reserves and hormones. Seeds of the G2 genotype show higher averages of proteins and lipids, and of the AIA hormones, proline, ethylene precursor ACC, spermine and spermidine. Essential oils of citronella and cinnamon are efficient in controlling fungi in Passiflora spp seeds. The essential oils of citronella and cinnamon affect the germination and vigor of the studied P. mucronata seeds. Cinnamon oil at a concentration of 0.5% is efficient in controlling fungi and does not affect the physiological quality of Passiflora spp seeds. L. sativa seeds have their physiological cycle affected by allelopathic substances present in the peel of P. mucronata fruits. The concentration of bark extracts from 50% inhibits the germination of L. sativa seeds. For passion fruit seeds, the behavior of the experiment and the adjustment was the same, regardless of the variable, number of repetitions and treatment, with and without saline stress. Using 14 repetitions, regardless of the number of seeds, there is a 50% reduction in the amplitude of the bootstrap confidence interval.
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Maracujazeiro , Citogenética , Precisão experimental , Qualidade fisiológica