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Suppression of reproductive characteristics of the invasive plant Mikania micrantha by sweet potato competition

文献类型： 外文期刊

作者： Shen, Shicai 1 ; Xu, Gaofeng 1 ; Clements, David Roy 2 ; Jin, Guimei 1 ; Liu, Shufang 1 ; Yang, Yanxian 1 ; Chen, Aido 1 ;

作者机构： 1.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Kunming 650205, Yunnan, Peoples R China

2.Trinity Western Univ, Dept Biol, 7600 Glover Rd, Langley, BC V2Y 1Y1, Canada

3.Kagawa Univ, Fac Agr, Dept Appl Biol Sci, Miki, Kagawa 7610795, Japan

关键词： Biological control;Mikania micrantha;Sweet potato;Competition;Flowering and fruiting phenology;Reproductive suppression

期刊名称：BMC ECOLOGY （ 影响因子：2.964； 五年影响因子：3.322 ）

ISSN： 1472-6785

年卷期： 2016 年 16 卷

页码：

收录情况： SCI

摘要： Background: As a means of biologically controlling Mikania micrantha H.B.K. in Yunnan, China, the influence of sweet potato [Ipomoea batatas (L.) Lam.] on its reproductive characteristics was studied. The trial utilized a de Wit replacement series incorporating six ratios of sweet potato and M. micrantha plants in 25 m(2) plots over 2 years. Results: Budding of M. micrantha occurred at the end of September; flowering and fruiting occurred from October to February. Flowering phenology of M. micrantha was delayed (P < 0.05), duration of flowering and fruiting was reduced (P < 0.05) and duration of bud formation was increased (P < 0.05) with increasing proportions of sweet potato. Reproductive allocation, reproductive investment and reproductive index of M. micrantha were significantly reduced (P < 0.05) with increasing sweet potato densities. Apidae bees, and Calliphoridae or Syrphidae flies were the most abundant visitors to M. micrantha flowers. Overall flower visits decreased (P < 0.05) as sweet potato increased. Thus the mechanism by which sweet potato suppressed sexual reproduction in M. micrantha was essentially two-fold: causing a delay in flowering phenology and reducing pollinator visits. The number, biomass, length, set rate, germination rate, and 1000-grain dry weight of M. micrantha seeds were suppressed (P < 0.05) by sweet potato competition. With proportional increases in sweet potato, sexual and asexual seedling populations of M. micrantha were significantly reduced (P < 0.05). The mortality of both seedling types increased (P < 0.05) with proportional increases in sweet potato. Conclusions: These results suggest that sweet potato significantly suppresses the reproductive ability of the invasive species M. micrantha, and is a promising alternative to traditional biological control and other methods of control. Planting sweet potato in conjunction with other control methods could provide a comprehensive strategy for managing M. micrantha. The scenario of controlling M. micrantha by utilizing a crop with a similar growth form may provide a useful model for similar management strategies in other systems.

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