Abstract
Spatial expansion of root hemiparasitic Pedicularis kansuensis in Bayanbulak Grassland of Xinjiang Uygur Autonomous Region (China) has caused great loss of herbage yield and has threatened the local livestock industry. Current management practices using manual eradication and chemical control have been proved problematic. Arbuscular mycorrhizal (AM) fungi have been suggested to be potential biocontrol agents against a number of plant pests, but experimental evidence is lacking against weedy P. kansuensis. In this study, we tested the hypothesis that inoculation with AM fungi will cause growth depression in P. kansuensis and reduce its damage to host plants. Based on the confirmation of AM status and host community of the hemiparasite in the field, a pot cultivation experiment was conducted to test the influence of an AM fungus (Glomus mosseae) on growth of P. kansuensis and the parasitized host (Elymus nutans). AM colonization was observed in roots of P. kansuensis, but the levels were much lower than those of its adjacent host species. A negative correlation between AM levels and the numbers of haustoria was detected for the field samples of the hemiparasite. Strong suppression of haustorium formation, a significant reduction in plant dry weight (DW), as well as marked reduction in the survival rate of P. kansuensis after inoculation with AM fungi was observed. In contrast, inoculation with G. mosseae increased root DW and whole plant DW of parasitized host plants. Our findings demonstrated significantly repressive effects of AM fungi on growth performance of P. kansuensis with and without the presence of a host. The potential of AM fungi as biocontrol agents against the damaging hemiparasite was confirmed.
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Acknowledgments
We thank Dr. Yongquan Ren for his inspiring discussion for writing up the paper. We are grateful to Prof. Sally Smith and Prof. Andrew Smith from the University of Adelaide, as well as the anonymous reviewers, for their valuable comments and suggestions to improve the paper. The research was financially supported by the Natural Science Foundation of China (grant nos. 30970288 and 31370512), Natural Science Foundation of Yunnan Province (grant no. 2009CD114), and Youth Innovation Promotion Association of Chinese Academy of Sciences (CAS), and a research fund (NO. P2012-KF03) from the Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, CAS.
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Sui, XL., Li, AR., Chen, Y. et al. Arbuscular mycorrhizal fungi: potential biocontrol agents against the damaging root hemiparasite Pedicularis kansuensis?. Mycorrhiza 24, 187–195 (2014). https://doi.org/10.1007/s00572-013-0528-5
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DOI: https://doi.org/10.1007/s00572-013-0528-5