首页   按字顺浏览 期刊浏览 卷期浏览 Frost hardiness gradients in shoots and roots ofpicea marianaseedlings
Frost hardiness gradients in shoots and roots ofpicea marianaseedlings

 

作者: StephenJohn Colombo,   Sheyun Zhao,   Eduardo Blumwald,  

 

期刊: Scandinavian Journal of Forest Research  (Taylor Available online 1995)
卷期: Volume 10, issue 1-4  

页码: 32-36

 

ISSN:0282-7581

 

年代: 1995

 

DOI:10.1080/02827589509382864

 

出版商: Taylor & Francis Group

 

关键词: cold hardiness;electrolyte leakage;freezing. Index of Injury;Picea mariana;root;shoot

 

数据来源: Taylor

 

摘要:

Frost hardiness of tissues along the length of the stem and the root was investigated in first‐year black spruce (Picea mariana(Mill.) B.S.P.) seedlings. Frost hardiness of 1 cm long stem and root segments was evaluated based on Index of Injury, calculated from post‐freezing electrolyte leakage. Frost hardiness was tested approximately weekly beginning seven weeks after seedlings were transferred from an 18 to a 10 h photoperiod, both at day/night temperatures of 26°C/16°C. Trees were transferred to temperatures of 10°C day and 5°C night at a 10 h photoperiod after a further 18 days. Frost hardiness was greater at the terminal bud and least at the root tips. Although shoots were generally more frost hardy than roots, differences in hardiness along the stem and root axes were gradual, rather than abruptly differing at the shoot‐root interface. All tissues, including root tips, increased in frost hardiness after conditioning for 18 days under short photoperiods (10 h) and warm temperatures (26ˆC/16°C, day/night). Under cold temperatures (10°C/5°C, day/night) all tissues, excepting the root tips, tolerated — 16°C with little subsequent electrolyte leakage.

 

点击下载:  PDF (493KB)



返 回