Variability in photoperiod and the inhibition of flowering in a high latitude population of Saxifraga rivularis

• Published in: Canadian Journal of Botany
• Main Authors: Teeri, J. A., Tonsor, S. J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1981
• Subjects: Plant Science; Canada; Devon Island; Saxifraga rivularis
• Online Access: http://dx.doi.org/10.1139/b81-052; http://www.nrcresearchpress.com/doi/pdf/10.1139/b81-052

A population of Saxifraga rivularis L. collected at Truelove Lowland, Devon Island, N.W.T., Canada (75°41′ N) exhibits a photoperiodic control of flowering in controlled environment chambers. The plants respond in a manner typical of long-day plants with flowering inhibited by either a 6-h daily dark period, or by a 6-h daily low intensity irradiance regime of incandescent light. The inhibition of flowering by 6 h day −1 of incandescent light does not occur if the incandescent light is given in twelve 0.5-h doses, each followed by 1 h of red-rich high intensity irradiance.