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.
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