Applied Microbiology and Biotechnology

, Volume 91, Issue 3, pp 741–755 | Cite as

Trichoderma harzianum strain SQR-T37 and its bio-organic fertilizer could control Rhizoctonia solani damping-off disease in cucumber seedlings mainly by the mycoparasitism

  • Xinqi Huang
  • Lihua Chen
  • Wei Ran
  • Qirong Shen
  • Xingming Yang
Applied Microbial and Cell Physiology


Damping-off disease is caused by Rhizoctonia solani and leads to serious loss in many crops. Biological control is an efficient and environmentally friendly way to prevent damping-off disease. Optical micrographs, scanning electron micrographs, and the determination of hydrolytic enzymes were used to investigate the antagonism of Trichoderma harzianum SQR-T37 (SQR-T37) against R. solani. Experiments were performed in pots to assess the in vivo disease-control efficiency of SQR-T37 and bio-organic fertilizer. The results indicate that the mycoparasitism was the main mechanism accounting for the antagonistic activity of SQR-T37. In one experiment, the population of R. solani was decreased from 106 internal transcribed spacer (ITS) copies per gram soil to 104 ITS copies per gram soil by the presence of the antagonist. In this experiment, 45% of the control efficiency was obtained when 8 g of SQR-T37 hyphae per gram soil was applied. In a second experiment, as much as 81.82% of the control efficiency was obtained when bio-organic fertilizer (SQR-T37 fermented organic fertilizer, BIO) was applied compared to only 27.27% of the control efficiency when only 4 g of SQR-T37 hyphae per gram soil was applied. Twenty days after incubation, the population of T. harzianum was 4.12 × 107 ITS copies per gram soil in the BIO treatment, which was much higher than that in the previous treatment (8.77 × 105 ITS copies per gram soil), where only SQR-T37 was applied. The results indicated that SQR-T37 was a potent antagonist against R. solani in a mycoparasitic way that decreased the population of the pathogen. Applying BIO was more efficient than SQR-T37 application alone because it stabilized the population of the antagonist.


Trichoderma harzianum SQR-T37 Rhizoctonia solani Mycoparasitism Bio-organic fertilizer (BIO) Quantification real-time PCR DGGE 



This research was financially supported by the Chinese Ministry of Science and Technology (2007CB109304 and 2009120) and by the Science and Technology Bureau of Jiangsu Province (BE2009672 and BA2008027).


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Xinqi Huang
    • 1
  • Lihua Chen
    • 1
  • Wei Ran
    • 1
  • Qirong Shen
    • 1
  • Xingming Yang
    • 1
  1. 1.Jiangsu Key Laboratory for Organic Solid Waste UtilizationNanjing Agricultural UniversityNanjingChina

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