Viability ofPícea abiesseedlings with damaged roots and shoots
作者:
Bjørnr. Langerud,
Pasi Puttonen,
Erik Troeng,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1991)
卷期:
Volume 6,
issue 1-4
页码: 59-72
ISSN:0282-7581
年代: 1991
DOI:10.1080/02827589109382649
出版商: Taylor & Francis Group
关键词: containerized seedlings;photosynthesis;Picea abies;root boiling;shoot pruning;transpiration;viability
数据来源: Taylor
摘要:
Cold stored, one‐year‐old Norway spruce seedlings were manipulated to obtain seedlings with different viabilities. Either half or whole root systems were submerged in boiling water for five minutes, or 40 or 75%of the shoot volume was cut away. The seedlings were grown in a climate chamber, and transpiration rates were estimated daily for 20 days after treatment by weighing individual seedlings. Rates of transpiration and photosynthesis were also measured by porometry after 20 days. Root and shoot growth was assessed after 21 days. Buds of treated seedlings broke earlier than the buds of untreated ones. The transpiration rate increased with time for the undamaged seedlings, while the severely damaged seedlings transpired at a uniform low rate throughout the experiment. Root growth capcity Failed to detect the different magnitudes of root damage, whereas the reduction in both transpiration and photosynthesis rates did. Transpiration rates estimated by weighing correlated linearly with those measured by porometer after 20 days, and both correlated with the rate of photosynthesis and the shoot volume. Also, the dry weight of roots grown during the experiment (root growth capacity) correlated significantly with the rate of photosynthesis.
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