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...The response of the invasive weed


The response of the invasive weed Mikania micrantha to infection density of the obligate parasite Cuscuta campestris and its implications for biological control of M. micrantha

موضوع: مقاله ای راجع به علفهای هرز و تراکم عفونت انگل 

زبان: انگلیسی

فرمت فایل: pdf

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The response of the invasive weed Mikania micrantha to infection density of the obligate parasite Cuscuta campestris and its implications for biological control of M. micrantha

Hao SHEN1,3, Lan HONG1'2'3, Hua CHEN1,2, Wan-Hui YE1*, Hong-Lin CAO1, and Zhang-Ming

1. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, P.R. China
2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, P.R. China
(Received February 12, 2008; Accepted May 28, 2010)

ABSTRACT. The efficacy of a biological control agent depends upon the impact it has on the target species.
We investigate the use of the obligate parasitic plant, Cuscuta campestris Yuncker as a biological control for the invasive weed Mikania micrantha H.B.K. In this experiment we test whether the impacts of the parasite on host growth, biomass allocation, photosynthesis, chlorophyll content, and soluble protein are affected by the density of the parasite. We examined the response of M. micrantha to infection densities of 0, 1, 2, 4 and 8 C. campestris seedlings per host plant. By day 30 after parasitization, C. campestris infection had significantly reduced M. micrantha biomass and the net photosynthetic rate of the 8th fully expanded leaf. These negative effects were greater as the number of parasites increased from 1 to 4 per host, but not from 4 to 8. Mikania micrantha stomatal conductance and transpiration rate were significantly reduced by C. campestris infection, but among 2, 4, 8 parasites per host there were no significant effects of infection densities on the host plants. Water use efficiency remained stable. The aerial parts of the infected M. micrantha plants at densities of 1, 2, 4 and 8 parasites per host died 83, 62, 50 and 46 d after parasitization on average, respectively. All infection densities decreased host chlorophyll content (a and b), and the infection by more than 1 parasite also signifi cantly lowered soluble protein concentration. The results indicated that the effects of C. campestris infection on M. micrantha are density dependent, which provides a basis for refining the use of the parasite for biologi cal control of M. micrantha. The optimal cost-effective number of parasites to control M. micrantha is 4 per host plant in the field.

Keywords: Biological control; Chlorophyll content; Growth; Invasive weed; Parasitic plant; Photosynthesis; Soluble protein; Weed management.

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