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| Impacts of Cd stress on growth,and accumulation and distribution of C,N,P and K in Toona ciliate Roem.Seedlings |
| Received:January 03, 2017 |
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| KeyWord:cadmium stress;growth and development;nutrient accumulation;Toona ciliate Roem.;biomass |
| Author Name | Affiliation | E-mail | | WANG Cen-nie | Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forest, Sichuan Agricultural University, Chengdu 611130, China
College of Tourism and Economic Management, Chengdu University, Chengdu 610106, China | | | LIU Shi-liang | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | LI Xun | Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forest, Sichuan Agricultural University, Chengdu 611130, China | | | WANG Li-ping | Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forest, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Jian | Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forest, Sichuan Agricultural University, Chengdu 611130, China
Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu 611130, China | sicauzhangjian@163.com |
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| Abstract: |
| In the presented work, the effects of different Cd stress on the growth and nutrient absorption(C, N, P, and K) of Toona ciliate Roem. seedlings were investigated. A controlled pot experiment was arranged with different treatments of six Cd dosages[control, 10, 20, 40, 80, and 160 mg·kg-1] to investigate the growth characteristics, biomass production and nutrient accumulation and distribution in the T. ciliata seedlings. The results indicated that the growth characteristic parameters(leaf growth, leaf length, leaf width, root length, base diameter, and shoot height) and tissue biomasses(i.e., root, stem, and leaf) declined with increasing Cd dosage, whereas the treatments with lower Cd dosage(<40 mg·kg-1) had no significant(P>0.05) influences on tissue index, plant height, and total biomass. Additionally, the Cd distribution pattern under different Cd treatments showed the same order, with root>stem and/or root>leaf. Moreover, with increasing Cd dosage, the accumulation of root K, stem K, leaf K, and leaf N showed a trend of increase at first and then decrease, whereas accumulation of root C, root N, stem N, root P, and leaf P gradually decreased. Furthermore, the treatments with higher Cd dosages(≥ 40.00 mg·kg-1) significantly inhibited the accumulation of stem C, leaf C, and stem P and altered their distribution patterns, whereas treatment with lower Cd dosages(<40 mg·kg-1) did not show significant effects. Results suggest that T. ciliata could adapt efficiently to Cd-contaminated environments by altering its nutrient use strategy and biomass distribution pattern. |
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