Lack of evidence for distinguishing florigen and flower hormone in Perilla

Summary The minimal duration of short-day (SD) treatment necessary to cause flower formation in the SD plant Perilla is 9 days, whereas leaves exposed to at least 12 SD can function as donors in grafting experiments. Zhdanova's report that SD given consecutively to different individual leaves for 2 or 3 days resulted in flowering, could not be confirmed.