Fotoperíodo, temperatura e reguladores vegetais na germinação de sementes de Passiflora cincinnata Mast.
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Data
2009-01-01
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Associação Brasileira de Tecnologia de Sementes (ABRATES)
Resumo
A espécie Passiflora cincinnata Mast., pertencente à família Passifloraceae, é silvestre e popularmente conhecida como maracujá-do-mato, sendo considerada importante na produção de porta-enxertos, uma vez que é tolerante à seca, a doenças causadas por bactérias e a nematóides, além de poder ser utilizada em programas de melhoramento genético. O trabalho teve como objetivos estudar o efeito da luz e da temperatura e a interação entre temperatura e reguladores vegetais na germinação de sementes de Passiflora cincinnata Mast. Foi constituído de três experimentos: no primeiro, estudou-se o efeito da luz e da temperatura na germinação de sementes; no segundo, o efeito de diferentes concentrações dos reguladores vegetais GA4+7 + N-(fenilmetil)-aminopurina na germinação das sementes e, no terceiro, a interação entre temperatura e reguladores vegetais na germinação das sementes. O delineamento experimental foi inteiramente casualizado para todos os experimentos e os dados foram submetidos à análise de variância e comparação das médias pelo teste Tukey, a 5% de probabilidade. É possível observar que a luz exerce efeito inibitório sobre a germinação das sementes, e que os reguladores vegetais, GA4+7 + N-(fenilmetil)-aminopurina, são eficientes na superação da dormência, além de ampliarem os limites de temperatura da germinação. A temperatura alternada 20-30ºC mostra-se a mais adequada para a germinação de sementes dessa espécie.
The species Passiflora cincinnata Mast., which belongs to the Passifloraceae family, is wild and commonly known as Crato Passion Fruit and it is also considered potentially important for rootstock production due to its tolerance to drought, bacterial diseases and nematodes. It can also be used in genetic breeding programs. This objective of this research was to study the effect of light and temperature and the interaction between temperature and plant growth regulators, on Passiflora cincinnata Mast. seed germination. Three experiments were developed: the first verified the effect of light and temperature on seed germination; the second, the effect of different concentrations of GA4+7 + N-(phenylmethyl)-1H-purine-6-amine plant growth regulators on seed germination; and the third, the interaction between temperature and plant growth regulators on seed germination. A randomized complete design was used in all the experiments and data were subjected to analysis of variance followed by mean comparison by the Tukey test, at 0.05 significance. Light had an inhibitory effect on seed germination, and GA4+7 + N-(phenylmethyl)-1H-purine-6-amine were efficient in breaking dormancy and increasing temperature limits. Alternating temperatures, 20-30ºC, were the most appropriate for seed germination in this species.
The species Passiflora cincinnata Mast., which belongs to the Passifloraceae family, is wild and commonly known as Crato Passion Fruit and it is also considered potentially important for rootstock production due to its tolerance to drought, bacterial diseases and nematodes. It can also be used in genetic breeding programs. This objective of this research was to study the effect of light and temperature and the interaction between temperature and plant growth regulators, on Passiflora cincinnata Mast. seed germination. Three experiments were developed: the first verified the effect of light and temperature on seed germination; the second, the effect of different concentrations of GA4+7 + N-(phenylmethyl)-1H-purine-6-amine plant growth regulators on seed germination; and the third, the interaction between temperature and plant growth regulators on seed germination. A randomized complete design was used in all the experiments and data were subjected to analysis of variance followed by mean comparison by the Tukey test, at 0.05 significance. Light had an inhibitory effect on seed germination, and GA4+7 + N-(phenylmethyl)-1H-purine-6-amine were efficient in breaking dormancy and increasing temperature limits. Alternating temperatures, 20-30ºC, were the most appropriate for seed germination in this species.
Descrição
Palavras-chave
maracujá, passifloráceas, propagação, passion fruit, Passifloraceae, propagation
Como citar
Revista Brasileira de Sementes. Associação Brasileira de Tecnologia de Sementes, v. 31, n. 3, p. 106-114, 2009.