2004 Volume 42 Issue 4 Pages 305-314
The interactions between vernalization and photoperiodic effects on inflorescence formation in radish varieties were investigated by applying a new index “flower formation index” to explain these effects quantitatively. According to “flower formation index, ” as the varieties that responded to the single treatment of either long day or low temperature by which the inflorescence formation dramatically accelerated, whereas either treatment hardly induced the inflorescence formation. Moreover, the condition of long day or short day on the varieties that showed insufficient photoperiodic induction comparatively has a dramatic effect on the inflorescence formation when it was at the condition of insufficient low temperature induction. Thus, the inflorescence formation of radish plants is dramatically influenced by photoperiod as well as by temperature, and the responses to these two factors significantly differ among the varieties. So it was supposed that interactions between vernalization and photoperiodic effects on inflorescence formation in radish varieties should be considered more that we considered until now.