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.
References
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Zeevaart, J.A.D. Lack of evidence for distinguishing florigen and flower hormone in Perilla . Planta 98, 190–194 (1971). https://doi.org/10.1007/BF00385352
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DOI: https://doi.org/10.1007/BF00385352