J Plant Ecol ›› 2020, Vol. 13 ›› Issue (1): 20-26.DOI: 10.1093/jpe/rtz050

• Research Articles • Previous Articles     Next Articles

The invasive potential of a hybrid species: insights from soil chemical properties and soil microbial communities

Feng Sun1,2, Yuyi Ou1, Qiaojing Ou1, Lingda Zeng1, Hanxia Yu1, Jin Zheng1, Lei Gao1, Weihua Li1, Na Li3,* and Changlian Peng1,*   

  1. 1Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Sciences, South China Normal University, Guangzhou 510631, China, 2State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing 100000, China, 3CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
  • Received:2019-06-14 Revised:2019-11-04 Accepted:2019-11-13 Online:2019-11-15 Published:2020-02-01

Abstract:

Aims

Natural hybridization between invasive and native species, as a form of adaptive evolution, threatens biodiversity worldwide. However, the potential invasive mechanisms of hybrids remain essentially unexplored, especially insights from soil chemical properties and soil microbial communities.

Methods

In a field experiment, soil microbial community, potassium-solubilizing bacteria, phosphorus-solubilizing bacteria, enzyme activities, and light-saturated photosynthetic rate were measured in invasive Sphagneticola trilobata and its hybrid with native Sphagneticola calendulacea in 2 years.

Important Findings

In general, soil dissolved organic carbon and the biomass of phosphorus-solubilizing bacteria were significantly higher under the hybrid treatment than S. trilobata and S. calendulacea. However, there were no significant differences in acid phosphatase, total PLFAs, bacterial PLFAs, fungi PLFAs, cellulase, and urase in these treatments. The hybrids had significantly higher light-saturated photosynthetic rate, photosynthetic nitrogen-, phosphorus-, potassium- use efficiencies than the invasive S. trilobata, but no significant difference with S. calendulacea. The total biomass and root biomass of hybrids were higher than S. calendulacea. Our results indicate that the hybrids species have a higher invasive potential than S. calendulacea, which may aggravate the local extinction of S. calendulaceain the future.

Key words: Sphagneticola trilobata, hybrid, soil microbial community, enzyme activity, light-saturated photosynthetic rate

摘要:
作为适应性进化,入侵物种与本土物种的自然杂交威胁着全球生物多样性。然而,杂交种的潜在入侵机制尚未得到系统研究,尤其是在土壤化学性质和土壤微生物群落方面。在一个为期两年的田间试验中,对入侵种南美蟛蜞菊(Sphagneticola trilobata)和杂交蟛蜞菊(南美蟛蜞菊与本地蟛蜞菊S. calendulacea杂交)的土壤微生物群落、土壤解钾菌和解磷菌菌落数、土壤酶活性以及叶片光饱和速率进行了测定。结果表明:杂交蟛蜞菊土壤可溶性有机碳和解磷菌菌落数显著高于南美蟛蜞菊和本地蟛蜞菊。土壤酸性磷酸酶、总PLFA、细菌PLFA、真菌PLFA、纤维素酶、脲酶在三种处理间无显著差异。杂交蟛蜞菊光饱和光合速率、光合氮、磷和钾利用效率显著高于入侵种南美蟛蜞菊,但与本地蟛蜞菊无显著差异。杂交蟛蜞菊总生物量和根生物量显著高于本地蟛蜞菊。因此,与本地蟛蜞菊相比,杂交蟛蜞菊仍然有较高的入侵性,其未来可能加剧本地蟛蜞菊的灭绝。

关键词: 南美蟛蜞菊, 杂交种, 土壤微生物群落, 酶活性, 光饱和光合速率