Effects of low temperature treatment on growth and flowering of Hypericum andorosaemum L cuttings
2009
Matsuno, T.(Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Kunitake, T. | Tanigawa, T. | Yamada, A. | Suyama, T.
The effects of low temperature treatment of cuttings, including potted cuttings, on growth and flowering of Hypericum andorosaemum L. 'Excellent Flair' were examined. Potted cuttings were exposed to ambient temperature from October 15, 2004 to March 9, 2005. These were repotted in 12 cm-plastic pots and grown under long day conditions in a greenhouse at a minimum temperature of 15degC. The number of nodes of the lateral branch at anthesis of the first floret and days to flowering were increased compared to those of controls treated at ambient temperature. Cuttings were treated under low temperature conditions at 2.5, 5 or 10degC for 0, 1, 2, 5 or 7 weeks. The number of roots increased when treated at 5degC or less for 5 weeks, and days to flowering were reduced when treated at 5degC for 5 or 7 weeks, compared with the other treatments. Potted cuttings were treated at 2.5, 5, 10 or 15degC for 1, 3, 5 or 7 weeks, or were untreated (control), remaining in the greenhouse for the entire experimental period. Days to flowering of plants treated at 2.5degC for 7 weeks or 5degC for 5 or 7 weeks and the number of nodes on the lateral branch at flowering were reduced after the treatment at 5degC for 5 weeks, compared to that of controls or those receiving other treatments. Based on the above findings, the low temperature treatment of cuttings increased the number of roots of cuttings and reduced the days to flowering in Hypericum 'Excellent Flair'.
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