Abstract

FACCINI, D.  and  PURICELLI, E.. Effect of temperature and the light on germination of Nicotiana longiflora Cavaniles and Oenothera indecora Camb. Agriscientia [online]. 2006, vol.23, n.1, pp.15-21. ISSN 1668-298X.

Nicotiana longiflora and Oenothera indecora are species of recent appearance in croplands in the Argentine humid pampa zone and there is a lack of knowledge about the environmental factors affecting their germination. The temperature and light requirements for germination and the base temperature of both species were determined. Under constant temperatures, germination was higher between 20 and 35 °C for N. longiflora and between 10 and 20 °C for O. indecora. Under fluctuating temperatures, N. longiflora showed higher germination rates in a wide range of temperatures with light. In darkness, germination was higher only between 10-20 °C for N. longiflora, whereas O. indecora germinated only with light, within a wide range of fluctuating temperatures. Base temperature under light and darkness conditions was approximately 14 °C for N. longiflora and approximately 6 °C for O. indecora. Base temperature indicates that N. longiflora is a species with a spring-summer growing season and O. indecora shows an autumn-spring-summer growing season.

Keywords : Germination; Temperature; Light; Nicotiana longiflora; Oenothera indecora.

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