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Timing of cold temperature exposure affects root and shoot frost hardiness ofPicea Marianacontainer seedlings

 

作者: StephenJ. Colombo,  

 

期刊: Scandinavian Journal of Forest Research  (Taylor Available online 1994)
卷期: Volume 9, issue 1-4  

页码: 52-59

 

ISSN:0282-7581

 

年代: 1994

 

DOI:10.1080/02827589409382812

 

出版商: Taylor & Francis Group

 

关键词: Picea mariana;cold hardiness;freezing damage;temperature;root;shoot.

 

数据来源: Taylor

 

摘要:

Seventeen‐week‐old black spruce seedlings were hardened under short daylengths and one of three short day length environments, which were either warm (24/16°C, day/night) throughout a 10 week hardening period (WW), cool (10/5°C) throughout hardening (CC), or warm for three weeks followed by seven weeks of cool temperatures (WC). Greatest root and shoot frost hardiness resulted from the exposure of seedlings to three weeks of warm followed by seven weeks of cool temperatures. Seedlings receiving warm temperatures throughout hardening increased in root and shoot frost hardiness, but to a lesser extent than seedlings exposed to cool temperatures. The frost hardiness of woody roots was generally greater than that of fine roots, but the extent of the difference in frost hardiness depended on the time since bud initiation and on the hardening treatment.

 

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