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Short-day treatment during the growing period limits shoot growth and increases frost hardiness of hybrid aspen plants in the nursery
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作者 Zhang Gang Jaana Luoranen Heikki Smolander 《Forestry Studies in China》 CAS 2007年第4期262-266,共5页
In Finland, under nursery conditions hybrid aspen may continue their shoot growth until early September. Thus, frost hardening is usually delayed. To solve this problem, we used a three-week period of short-day (SD)... In Finland, under nursery conditions hybrid aspen may continue their shoot growth until early September. Thus, frost hardening is usually delayed. To solve this problem, we used a three-week period of short-day (SD) treatment between late July and mid-August. During autumn after frost exposure, frost hardiness (FH) was assessed three times with a stem-browning test. The resuits showed that after SD treatment shoot growth ceased and FH increased when compared to untreated hybrid aspen. Furthermore, the height of SD-treated hybrid aspen varied much less than that of the control plants. We conclude that SD treatment in the nursery during the growing period can be used as a supplementary method for producing well-hardened and uniform hybrid aspen plants. 展开更多
关键词 frost hardiness nursery performance POPULUS shoot elongation short-day treatment
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