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Elevated temperature may accelerate invasive expansion of the liana plant Ipomoea cairica

Authors

  • R-L WANG,

    1. Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou, China
    2. State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, East Campus, Guangzhou, China
    3. Key Laboratory of Ecological Agriculture, Ministry of Agriculture, South China Agricultural University, Guangzhou, China
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  • R-S ZENG,

    1. Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou, China
    2. Key Laboratory of Ecological Agriculture, Ministry of Agriculture, South China Agricultural University, Guangzhou, China
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  • S-L PENG,

    1. State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, East Campus, Guangzhou, China
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  • B-M CHEN,

    1. State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, East Campus, Guangzhou, China
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  • X-T LIANG,

    1. Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou, China
    2. Key Laboratory of Ecological Agriculture, Ministry of Agriculture, South China Agricultural University, Guangzhou, China
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  • X-W XIN

    1. Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou, China
    2. Key Laboratory of Ecological Agriculture, Ministry of Agriculture, South China Agricultural University, Guangzhou, China
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Shao-Lin Peng, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen (Zhongshan) University, East Campus, Bei San Road, Guangzhou 510006, Guangdong, China. Tel: (+86) 20 39332983; Fax: (+86) 20 39332983; E-mail: lsspsl@mail.sysu.edu.cn

Abstract

WangR-L,ZengR-S,PengS-L,ChenB-M,Liang X-T & Xin X-W (2011) Elevated temperature may accelerate invasive expansion of the liana plant Ipomoea cairica. Weed Research51, 574–580.

Summary

Numerous studies have shown that elevated CO2 levels promote liana establishment in forests, thus suggesting their increased prevalence in the future in these habitats. Limited information exists, however, concerning the effects of potentially increasing global temperatures on these plants. The invasive liana Ipomoea cairica has infested many forests in South China. We hypothesised that elevated temperature could change the resource allocation pattern and allelopathic potential of this plant, resulting in increased invasiveness. We compared seed germination, growth rates and leachate phytotoxicity of I. cairica at three temperatures (22, 26 and 30°C). The seed germination rates of I. cairica were 11.6%, 21.2% and 26.4% at 22, 26 and 30°C respectively. Elevated temperature resulted in significant changes in morphology and biomass allocation of I. cairica. Shoot biomass of the plant increased, while the root biomass decreased with increasing temperature. Phytotoxicity of aqueous leachates from fresh leaves of I. cairica varied depending on receptor plants, but showed the strongest phytotoxic effects at the highest temperature (30°C). Our results provide key information concerning the effects of elevated temperatures on the allelopathic potential, germination and growth of I. cairica and indicate that global warming could increase the invasiveness of this species.

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