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Effects of Simulated Defoliation on Growth and Photosynthetic Characteristics of an Invasive Liana, Ipomoea cairica (Convolvulaceae)

文献类型： 外文期刊

作者： Li, Weihua 1 ; Tian, Xingshan 2 ; Luo, Jianning 3 ; Dai, Yanhong 1 ; Peng, Changlian 1 ;

作者机构： 1.S China Normal Univ, Key Lab Ecol & Environm Sci Guangdong Higher Educ, Coll Life Sci, Guangzhou, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Plant Protect Res Inst, Guangzhou, Guangdong, Peoples R China

3.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangzhou, Guangdong, Peoples R China

关键词： Invasive weeds;Ipomoea cairica;photosynthetic characteristics;plant biomass

期刊名称：INVASIVE PLANT SCIENCE AND MANAGEMENT （ 影响因子：1.273； 五年影响因子：1.347 ）

ISSN： 1939-7291

年卷期： 2012 年 5 卷 2 期

页码：

收录情况： SCI

摘要： To better understand the response of Ipomoea cairica (Cairo morningglory) to herbivory, the compensatory growth and photosynthetic characteristics of plants were measured after simulated herbivory by leaf trimming at four intensities: 25, 50, 75, and 100% removal, starting from the apex. Defoliation at 25% had no significant influence on plant biomass, but the total biomass (-19 to -66%) and root biomass (-31 to -75%) of the plants decreased significantly when defoliation intensity was >= 50% (P < 0.05). Photosynthetic rates (P-n) increased with defoliation intensity (P < 0.01), and P-n values in the defoliated plants were 10 to 72% greater than those in the control plants, a relationship that could be attributed to a decrease in stomatal limitation (-11 to -34%) and the increase in rubisco content (9 to 18%) as well as higher photosynthetic efficiency and less light energy dissipated as heat. At defoliation intensities up to 50%, plants needed more energy to compensate photosynthetically, which could influence the plant photosynthetic characteristics as well as the allocation of assimilates, resulting in less root development. Since the spread of I. cairica depends primarily on clonal growth, smaller roots could limit uptake of nutrients from the soil. These direct and indirect effects indicate that leaf-feeding herbivores may have potential for biological control of I. cairica but to have any effect the herbivores would need to consume >= 50% of the leaf biomass.

  • 相关文献

[1]Patterns of defoliation and their effect on the plant growth and photosynthetic characteristics of Ipomoea cairica. Li, Weihua,Peng, Changlian,Zhou, Xianye,Luo, Jianning,Tian, Xingshan.

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