4.4 Article

Effects of clonal integration and nitrogen supply on responses of a clonal plant to short-term herbivory


Volume 12, Issue 4, Pages 624-635


DOI: 10.1093/jpe/rty057


Agasicles hygrophila; Alternanthera philoxeroides; foliar herbivory; invasive species; physiological integration


  1. National Key Research and Development Program of China [2016YFC1201101, 2016YFC1202102]
  2. National Natural Science Foundation of China [31500331, 31670428]
  3. Fundamental Research Funds for the Central Universities [2015ZCQ-BH-01]
  4. Undergraduate Innovation and Entrepreneurship Training Program of Beijing Forestry University [X201710022152]

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Aims Clonal integration, i.e. resource sharing between interconnected ramets, can help clonal plants tolerate abiotic stress. However, few studies have directly examined the ecological significance of clonal integration in the ability of clonal plants to tolerate biotic stress such as herbivory. Methods We grew clonal fragments of an invasive clonal plant Alternanthera philoxeroides, each consisting of an apical part (relatively young) and a basal part (relatively old), at two levels (low and high) of soil nitrogen (N). For each fragment, the apical part was subjected to either no herbivory or herbivory for 2 weeks by a specialist insect, Agasicles hygrophila, and was either connected with or disconnected from the basal part not subjected to herbivory. Important Findings Herbivory in the apical part severely reduced leaf growth (leaf mass, leaf number or leaf area) and ramet production of both apical and basal parts, and increased root to shoot ratio of the apical part. Irrespective of herbivory and soil N, stem connection between the apical and the basal part decreased root to shoot ratio of the apical part, but did not change its growth measures. Meanwhile, connection increased stem N concentration of the apical part growing under high-N supply and decreased stem carbon (C) concentration of the apical part under low-N supply. By contrast, connection increased root to shoot ratio of the basal part, but reduced its leaf and ramet production. Connection also increased leaf and stem C concentrations of the basal part under low-N supply. Thus, clonal integration can be beneficial for the early development of young A. philoxeroides ramets, but not for their local adaptation to herbivory damage by A. hygrophila.


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