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Copyright of Brazilian Journal of Agricultural Sciences / Revista Brasileira de Ciências Agrárias is the property of Universidade Federal Rural de Pernambuco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The objective of this research was to evaluate the effect of temperature and light on germination of Vernonia polyanthes Less. seeds. Therefore were tested six constant temperatures (15, 20, 25, 30, 35 and 40°C), and four combinations of alternating temperatures (15-20, 15-25, 20-30 and 20-35°C) in the presence and absence, which was provided during periods of higher temperatures, when evaluating the rotation. The variables evaluated were: degree of moisture, germination and vigor (first count of germination and speed of germination). The completely random design was used and the results were submitted to analysis of variance with means compared by Tukey test at 5% probability. Seeds of the Vernonia polyanthes species are preferential photoblastic with germination favored in the presence of light. The highest percentage of germination and seed vigor levels of the seeds of V. polyanthes were obtained in temperatures of 25°C constant and alternating 15-25°C in the presence of light. [ABSTRACT FROM AUTHOR]