Temperature requirements for seed germination of Pereskia aculeata and Pereskia grandifolia |
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| Affiliation: | 1. Federal University of Rio Grande do Sul, Department of Horticulture and Forestry, Agronomy Faculty, Porto Alegre 91501-970, Brazil;2. Federal University of Rio Grande do Sul, Department of Forage Plants and Agro, Meteorology, Agronomy Faculty, Porto Alegre 91501-970, Brazil;1. Universidade Federal do Rio Grande do Sul (UFRGS), Faculdade de Veterinária, Setor de Suínos, Av. Bento Gonçalves 9090, CEP 91540–000 Porto Alegre, RS, Brazil;2. Faculdade de Medicina Veterinária, Universidade do Oeste de Santa Catarina, CEP 89820–000 Xanxerê, SC, Brazil;3. UFRGS, Faculdade de Agronomia,Agronomia, Departamento de Zootecnia, Av. Bento Gonçalves, 7712, CEP 91540–000 Porto Alegre, RS, Brazil;1. Centre for Biological Control (CBC), Zoology and Entomology Department, Rhodes University, Grahamstown 6139, South Africa;2. Centre for Biological Control (CBC), Botany Department, Rhodes University, Grahamstown 6139, South Africa;1. Federal University of Lavras, Department of Food Science, Laboratory of Food Refrigeration, P.O. Box 3037, 37200-000, Lavras, Minas Gerais, Brazil;2. Federal University of Lavras, Department of Exact Sciences, P.O. Box 3037, 37200-000, Lavras, Minas Gerais, Brazil;3. Federal University of Juiz de Fora, College of Pharmacy, P.O. Box 36036-330, Juiz de Fora, Minas Gerais, Brazil |
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| Abstract: | Pereskia aculeata and Pereskia grandifolia have been studied widely due to their high nutritional and therapeutic values. However, little is known about the biological requirements of their seeds for the various germination factors. Thus, this experiment aimed to evaluate the thermal effects on the germination of these species at the temperatures of 24 °C, 27 °C, 30 °C, 33 °C and 36 °C. After verification of the existence of differences in the performance of germination, a non-linear regression was carried out, relating the germination to temperature and identifying its point of maximum efficiency. We found that the lowest synchronization indexes of germination were observed close to 30 °C. The best germination response of the P. aculeata and P. grandifolia was observed at 30 °C and 33 °C, respectively, with greater germination strength and fewer days to attain 63.21% of germinations. The results obtained from the germination of P. aculeata and P. grandifolia can be described by the Weindull distribution model with three parameters, as proposed by Carneiro and Guedes (1992). |
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| Keywords: | Cactaceae Germination Pereskia aculeata Pereskia grandifolia |
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