Trichoderma gamsii strain TC959 with comprehensive functions to effectively reduce seedling damping-off and promote growth of pepper by direct and indirect action mechanisms

IF 4.6 1区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Heng-xu WANG, Hao HU, Tian-you ZHAO, Zhao-qing ZENG, Wen-ying ZHUANG
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Abstract

A few Trichoderma species have been utilized as biocontrol agents in agriculture due to their ability to inhibit growth of phytopathogens. However, the antagonistic mechanism of some strains is mainly performed by direct action. The objective of our study is to explore an effective strain that has comprehensive abilities, and preliminarily clarify its practical viability and action mechanism. Trichoderma gamsii strain TC959 possessing abilities of strong antagonism and plant growth promotion was singled out. It released secondary metabolites, siderophores and chitinase/xylanase to directly inhibit the growth of plant pathogens, or released indole-3-acetic acid/gibberellin to promote plant growth. The strain also activated induced systemic resistance by increasing chlorophyll a/b ratio and jasmonic acid content of pepper seedlings through root colonization, which resulted in the improvements of defense-related gene expression levels, antioxidant enzyme activity, and indole-3-acetic acid/gibberellin production. Thereby disease resistance and plant growth were enhanced and promoted, respectively. Furthermore, TC959 had a resistance advantage to oxidation and chemical fungicides, which helped viability of the strain to be maintained, and healthy pepper seedlings were effectively ensured. In conclusion, strain TC959 has biocontrol potential and comprehensive functions against pepper damping-off disease, which is valuable for further practical applications.

具有综合功能的 Trichoderma gamsii 菌株 TC959,通过直接和间接作用机制,有效减少辣椒幼苗受潮,促进辣椒生长
由于能够抑制植物病原体的生长,一些毛霉菌种已被用作农业生物控制剂。然而,一些菌株的拮抗机制主要是通过直接作用来实现的。我们的研究旨在探索一种具有综合能力的有效菌株,并初步阐明其实际生存能力和作用机制。我们筛选出了具有强拮抗和促进植物生长能力的 Trichoderma gamsii 菌株 TC959。它释放次生代谢产物、苷元和几丁质酶/木聚糖酶,直接抑制植物病原体的生长,或释放吲哚-3-乙酸/赤霉素促进植物生长。该菌株还通过根定植提高辣椒幼苗的叶绿素 a/b 比值和茉莉酸含量,从而激活诱导系统抗性,提高防御相关基因的表达水平、抗氧化酶活性和吲哚-3-乙酸/赤霉素的产量。因此,抗病性和植物生长分别得到了增强和促进。此外,TC959 还具有抗氧化和抗化学杀菌剂的优势,这有助于保持菌株的活力,有效确保辣椒幼苗的健康。总之,TC959 菌株具有生物防治潜力和防治辣椒落叶病的综合功能,具有进一步的实际应用价值。
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来源期刊
Journal of Integrative Agriculture
Journal of Integrative Agriculture AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
7.90
自引率
4.20%
发文量
4817
审稿时长
3-6 weeks
期刊介绍: Journal of Integrative Agriculture publishes manuscripts in the categories of Commentary, Review, Research Article, Letter and Short Communication, focusing on the core subjects: Crop Genetics & Breeding, Germplasm Resources, Physiology, Biochemistry, Cultivation, Tillage, Plant Protection, Animal Science, Veterinary Science, Soil and Fertilization, Irrigation, Plant Nutrition, Agro-Environment & Ecology, Bio-material and Bio-energy, Food Science, Agricultural Economics and Management, Agricultural Information Science.
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