NDLI: Growth and photosynthetic responses of ectomycorrhizal pine seedlings exposed to elevated Cu in soils

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Growth and photosynthetic responses of ectomycorrhizal pine seedlings exposed to elevated Cu in soils

Content Provider	Springer Nature Link
Author	Chen, Yahua Nara, Kazuhide Wen, Zhugui Shi, Liang Xia, Yan Shen, Zhenguo Lian, Chunlan
Copyright Year	2015
Abstract	It is still controversial whether ectomycorrhizal (ECM) mycelia filter out toxic metals in nutrient absorption of host trees. In this study, pine (Pinus densiflora) seedlings colonized by Cu-sensitive and Cu-tolerant ECM species were exposed to a wide spectrum of soil Cu concentrations to investigate functions of ECM fungi under Cu stress. The photosynthetic rates of intact needles were monitored in situ periodically. The biomass and elements of plants were also measured after harvest. The ameliorating effect of ECM infection on host plants exposed to toxic stress was metal concentration specific. Under lower-level Cu stress, ECM fungi increased seedling performance, while ECM seedlings accumulated more Cu than nonmycorrhizal (NM) seedlings. Under higher-level Cu stress, photosynthesis decreased well before visible symptoms of Cu toxicity appeared. The reduced photosynthesis and biomass in ECM seedlings compared to NM seedlings under higher Cu conditions were also accompanied by lower phosphorus in needles. There was no marked difference between the two fungal species. Our results indicate that the two ECM fungi studied in our system may not have an ability to selectively eliminate Cu in nutrient absorption and may not act as effective barriers that decrease toxic metal uptake into host plants.
Starting Page	561
Ending Page	571
Page Count	11
File Format	PDF
ISSN	09406360
Journal	Mycorrhiza
Volume Number	25
Issue Number	7
e-ISSN	14321890
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-02-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Copper uptake ECM fungi Heavy metal-contaminated soils Metal toxicity Photosynthesis Pine (Pinus densiflora) Microbiology Plant Sciences Ecology Agriculture Forestry
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Molecular Biology Ecology, Evolution, Behavior and Systematics

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