Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
763119
Reference Type
Journal Article
Title
The influence of ectomycorrhiza on nitrogen nutrition and growth of Pinus sylvestris seedlings
Author(s)
Ingestad, T; Arveby, AS; Kafar, M
Year
1986
Is Peer Reviewed?
1
Journal
Physiologia Plantarum
ISSN:
0031-9317
EISSN:
1399-3054
Volume
68
Issue
4
Page Numbers
575-582
Language
English
DOI
10.1111/j.1399-3054.1986.tb03399.x
URL
http://doi.wiley.com/10.1111/j.1399-3054.1986.tb03399.x
Exit
Abstract
Ectomycorrhizal seedlings of Scots pine (Pinus sylvestris L. cv.), inoculated with the fungus Suillus bovinus (L. ex Fr.) O. Kuntze, and non-mycorrhizal controls were grown in growth units with a circulating culture solution. Steady-state nutrition and constant relative growth rates were achieved by means of varied relative nutrient addition rates and free access of nutrients. Typical mycorrhizas always formed within a short period of time after inoculation. The nutrition/growth relationships were in principle similar to previous studies under steady-state conditions: there were close linear relationships between relative addition rate, relative growth rate and internal nitrogen concentration, i.e. an equilibrium established between nutrients added and taken up. This occurred when infected and uninfected seedlings were grown separately. When grown together in the same growth unit, there are indications that the fungus influenced the exudation pattern of the uninfected seedlings. More carbon was thus provided to the unspecified microflora in the cultivation system, and it was able to grow and withhold nitrogen from the seedlings. The mycorrhizal infection did not increase the specific uptake capacity of the roots, and the fungus constituted a sink for carbon. However, the nitrogen productivity (growth rate per unit of nitrogen per unit of time) was similar for mycorrhizal and non-mycorrhizal seedlings, so that there might be mechanisms which compensate for the carbon cost.
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity