Survival Dynamics of Trichoderma longibrachiatum Tr58 in Conidia- and Chlamydospore-Amended Soils with Different Moisture Levels

Qiulin Cao, Yao Liang, Ying Tian, Hua Lian, Xiliang Jiang and Mei Li ()
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Qiulin Cao: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Yao Liang: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Ying Tian: Henan International Joint Laboratory of Green Pest Control, College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, China
Hua Lian: College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing 163319, China
Xiliang Jiang: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Mei Li: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Agriculture, 2023, vol. 13, issue 2, 1-10

Abstract: Two types of Trichoderma longibrachiatum Tr58 propagules, conidia and chlamydospores, were added to soils with different moisture levels. The survival dynamics of Tr58 in soils were determined. There are positive linear relationships between soil moisture levels and germination rates of the two propagules. In natural non-sterilized soil, the germination of more than 95% conidia and 60% chlamydospores was inhibited, while a high soil moisture content and sterilization were beneficial to spore germination. The inhibitory effect of soil with 80% moisture content on the germination of chlamydospores was almost completely eliminated after sterilization. Twelve months after the conidia inoculated to the natural soil, the Tr58 propagules decreased continuously, which was hastened in soils with lower moisture content and almost near zero 24 months later, in all soils. In chlamydospore-amended soils, the Tr58 propagules generally showed a dynamic process of decreasing in the first month, increasing in the 2nd month, and then decreasing gradually. The average Tr58 content in chlamydospore-amended soils with 5, 10, 20, 40, and 80% moisture content was 19.2 times that of conidia-amended soils at 12 months. At 24 months, the Tr58 content was about 2.2% of the initial Tr58 content and 114 times that of conidia in soils with 20% moisture content. However, for 80% moisture content, the Tr58 content in soil was 0.0038% of the initial content of Tr58. According to the results of this study, 10–20% soil moisture content was the most favorable for the long-term survival of Tr58, and the survival ability of chlamydospores was stronger than that of conidia and had greater application potential in disease control.

Keywords: fungal propagules; soil moisture level; Trichoderma longibrachiatum Tr58; survival dynamics; soil fungistasis (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
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