Record ID No. |
171 |
Author(s) |
Huang Y., Tao S. , 2004 |
Affiliation |
Peking University, College of Environmental Science, Beijing 100871, Peoples R China |
Title |
Influences of excessive Cu on photosynthesis and growth in ectomycorrhizal Pinus sylvestris seedlings |
Source. Vol.(no):Page |
Journal of Environmental Sciences-China. 16(3): 414-419 p. |
Categories |
Ectomycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Heavy Metals |
Host |
Scots pine, Pinus sylvestris |
Organism |
Suillus bovinus |
Country |
China, Asia |
Abstracts |
Growth and photosynthesis responses were measured for
Scots pine( Pinus sylvestris L. cv.) inoculated with
ectomycorrhizal fungi(Suillus bovinus) under 6.5 and 25 mg/L Cu
treatments to evaluate ectomycorrhizal seedlings' tolerance to
heavy metal stress. Results showed that excessive Cu can
significantly impair the growth and photosynthesis of pine
seedlings, but such impairment is much smaller, to the
ectomycorrhizal seedlings. Under 25 mg/L Cu treatment, the dry
weight of ectomycorrhizal seedlings is 25% lower than the
control in contrary to 53% of the non-mycorrhizal seedlings, and
the fresh weight of ectomycorrhizal roots was significantly
higher than those of non-mycorrhizal roots, about 25% and 42%
higher at 6.5 and 25 mg/L Cu treatments respectively.
Furthermore, ectomycorrhizal fungi induced remarkable difference
in the growth rate and pigment content of seedlings under
excessive Cu stress. At 25 mg/L Cu, the contents of total
chlorophyll, chlorophyll-a and chlorophyll-b were 30% higher in
ectomycorrhizal plants than those in non-mycorrhizal plants. 02
evolution and electron transport of PSI and PSII were restrained
by elevated Cu stress. However, no significant improvement was
observed in reducing the physiological restraining in
ectomycorrhizal seedlings over the non-mycorrhizal ones.
|