Biodiv Sci ›› 2019, Vol. 27 ›› Issue (4): 409-418.  DOI: 10.17520/biods.2019006

Special Issue: 土壤生物与土壤健康

• Original Papers: Animal Diversity • Previous Articles     Next Articles

Effect of soil nematode functional guilds on plant growth and aboveground herbivores

Baijing Zhu, Jingrong Xue, Rong Xia, Miaomiao Jin, You Wu, Shanyi Tian, Xiaoyun Chen*(), Manqiang Liu, Feng Hu   

  1. Soil Ecology Laboratory, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095
  • Received:2019-01-08 Accepted:2019-03-14 Online:2019-04-20 Published:2019-06-05
  • Contact: Xiaoyun Chen

Abstract:

Soil multitrophic interactions are the keystone of understanding mechanisms of ecological function. In order to test the effect of nematode functional guilds on rice growth and Nilaparvata lugens abundance, a pot experiment was conducted by growing rice with a complete factorial design manipulating microbivores (microbivorous nematodes), herbivores (herbivorous nematodes) and omnivore-carnivores (omnivore-carnivorous nematodes). Results showed that compared with no nematodes, herbivores significantly increased rice root biomass (P < 0.05) and total shoot phenolic content (P < 0.05). The microbivores significantly increased N. lugens abundance and significantly reduced root biomass (P < 0.05). Omnivore-carnivores promoted rice shoot growth (P < 0.05), decreased the number of N. lugens (P < 0.05). Higher total phenolic content occurred in treatment receiving all three nematode functional guilds, suggesting stronger potential for insect resistance. In conclusion, organisms at higher trophic levels, such as omnivore-carnivores, could promote plant defense and suppress aboveground herbivory via regulating the herbivores and microbivores. Soil biota managements play central roles in control of trophic level diversity.

Key words: soil biodiversity, biotic interactions, plant chemistry, aboveground-belowground, plant defense