Abstract
The invasive clonal plant Wedelia trilobata contains higher levels of ent-kaurane diterpenes, which are precursors of gibberellins (GAs), and higher rates of clonal growth than its native congener W. chinensis in invaded habitats. We hypothesized that the higher levels of endogenous GAs facilitate greater ramet growth in W. trilobata compared with W. chinensis. We quantified endogenous levels of GA1+3 in the two species and compared their growth responses to the changes of endogenous and exogenous GA3 by using short-term and long-term hydroponics experiments. After a period of homogeneous cultivation, levels of endogenous GA1+3 were higher in W. trilobata than in W. chinensis. The reduction of endogenous GAs repressed the emergence of adventitious roots and the growth of W. trilobata in the initial cultivation stage, and inhibited its shoot elongation and biomass. Levels of endogenous GA1+3 were positively correlated with the length of shoots and adventitious roots of W. trilobata. Adventitious roots of W. trilobata also emerged earlier and grew faster when treated with exogenous GA3. In contrast, exogenous GA3 treatment inhibited the length of adventitious roots in W. chinensis, and levels of endogenous GA1+3 did not correlate with shoot or adventitious root length. Our study suggests that GAs accelerate the rapid clonal growth of W. trilobata, more than that of its native congener W. chinensis, illustrating the relationship between plant hormones and the clonal growth of invasive plants. These findings are important for understanding the mechanisms associated with the invasiveness of clonal plants and their potential management.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (31170386, 31570414, 31200316), the Natural Science Foundation of Jiangsu (BK20150503, BK20150504), the Jiangsu University Research Foundation (14JDG010, 15JDG032), the Natural Science Research Project of Higher Education of Jiangsu (14KJB610005), the Jiangsu Planned Projects for Postdoctoral Research Funds (1501028B), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment. We thank Professor Fei-Hai Yu (Beijing Forestry University, China) and Professor Jun-Min Li (Taizhou University, China) who provided the ramets of W. chinensis. We also appreciate the editors and anonymous reviewers for their critical comments.
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Dai, ZC., Fu, W., Qi, SS. et al. Different Responses of an Invasive Clonal Plant Wedelia trilobata and its Native Congener to Gibberellin: Implications for Biological Invasion. J Chem Ecol 42, 85–94 (2016). https://doi.org/10.1007/s10886-016-0670-6
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DOI: https://doi.org/10.1007/s10886-016-0670-6