Volatile Organic Compounds Emitted by the Biocontrol Agent Pythium oligandrum Contribute to Ginger Plant Growth and Disease Resistance

Sheikh, Taha Majid Mahmood; Zhou, Dongmei; Ali, Haider; Hussain, Sarfraz; Wang, Nan; Chen, Siqiao; Zhao, Yishen; Wen, Xin; Wang, Xiaoyu; Zhang, Jinfeng; Wang, Lunji; Deng, Shuduan; Feng, Hui; Raza, Waseem; Fu, Pengxiao; Peng, Hao; Wei, Lihui; Daly, Paul

doi:10.1128/spectrum.01510-23

Cited by 7 publications

(1 citation statement)

References 92 publications

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“…It is likely that the tomato's defense priming in part occurs via the constitutively expressed P. oligandrum elicitin-like protein oligandrin, as oligandrin has been shown previously to induce defense responses when applied to tomato fruit [54], and also possibly via P. oligandrum Nep1-like proteins (NLPs) which were shown recently to reduce the P. capsici infection of tomato fruits [55]. Previously, volatiles from the P. oligandrum GAQ1 strain were shown to up-regulate genes involved in growthrelated hormone signaling and stress responses in ginger [56,57]. Note that the contribution of P. oligandrum-produced volatiles to the tomato seedling roots' gene expression is probably limited as the volatile compounds likely diffuse out from the culture dishes.…”

Section: Discussionmentioning

confidence: 99%

Biological Control of a Root-Knot Nematode Meloidogyne incognita Infection of Tomato (Solanum lycopersicum L.) by the Oomycete Biocontrol Agent Pythium oligandrum

Xue,

Li,

et al. 2024

JoF

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The biocontrol agent Pythium oligandrum, which is a member of the phylum Oomycota, can control diseases caused by a taxonomically wide range of plant pathogens, including fungi, bacteria, and oomycetes. However, whether P. oligandrum could control diseases caused by plant root-knot nematodes (RKNs) was unknown. We investigated a recently isolated P. oligandrum strain GAQ1, and the P. oligandrum strain CBS530.74, for the control of an RKN Meloidogyne incognita infection of tomato (Solanum lycopersicum L.). Initially, P. oligandrum culture filtrates were found to be lethal to M. incognita second-stage juveniles (J2s) with up to 84% mortality 24 h after treatment compared to 14% in the control group. Consistent with the lethality to M. incognita J2s, tomato roots treated with P. oligandrum culture filtrates reduced their attraction of nematodes, and the number of nematodes penetrating the roots was reduced by up to 78%. In a greenhouse pot trial, the P. oligandrum GAQ1 inoculation of tomato plants significantly reduced the gall number by 58% in plants infected with M. incognita. Notably, the P. oligandrum GAQ1 mycelial treatment significantly increased tomato plant height (by 36%), weight (by 27%), and root weight (by 48%). A transcriptome analysis of tomato seedling roots inoculated with the P. oligandrum GAQ1 strain identified ~2500 differentially expressed genes. The enriched GO terms and annotations in the up-regulated genes suggested a modulation of the plant hormone-signaling and defense-related pathways in response to P. oligandrum. In conclusion, our results support that P. oligandrum GAQ1 can serve as a potential biocontrol agent for M. incognita control in tomato. Multiple mechanisms appear to contribute to the biocontrol effect, including the direct inhibition of M. incognita, the potential priming of tomato plant defenses, and plant growth promotion.

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Section: Discussionmentioning

confidence: 99%

Biological Control of a Root-Knot Nematode Meloidogyne incognita Infection of Tomato (Solanum lycopersicum L.) by the Oomycete Biocontrol Agent Pythium oligandrum

Xue,

Li,

et al. 2024

JoF

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Implications in Phytohormone Research: From Lab to Field

Arif,

Mustafa,

Cheng

2024

Plant Growth Regulators: Resilience for Sustainable Agriculture

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Applications of Pythium- and Phytophthora-produced volatiles in plant disease control

Sheikh,

Chen,

Wang

et al. 2024

Appl Microbiol Biotechnol

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Volatile organic compounds (VOCs) mediate biological interactions and are produced by Pythium and Phytophthora species. These VOCs are biotechnologically relevant because the genera include important plant pathogens, whereby VOCs can aid in disease detection, and biological control agents, whereby VOCs contribute to disease control. Studies on VOC production, identification, and characterization of individual VOCs produced by Pythium and Phytophthora species are reviewed. VOCs detected in plants infected with Phytophthora species are also reviewed as potentially oomycete-derived VOCs. The Pythium- and Phytophthora-produced VOCs are compared with other microorganisms, and the main effects of these VOCs on microbial inhibition and plant-mediated effects are reviewed. These effects are summarized from direct demonstration studies and inferences based on the known functions of the identified Pythium- and Phytophthora-produced VOCs. There are two main applications of VOCs to plant disease control: the use of VOCs to detect pathogenic Pythium and Phytophthora species, e.g., e-nose detecting systems, and the use of VOC-producing biological control agents, e.g., Pythium oligandrum. Future research could understand how the VOCs are produced to engineer VOC levels in strains, analyze more oomycete species and strains, accurately quantify the VOCs produced, and exploit recent developments in analytical chemistry technology. Key points • Compiled inventory of volatiles produced by Phytophthora and Pythium species • Volatilomes contain microbe-inhibiting and plant growth-promoting compounds • Volatile potential in disease detection and control supports analyzing more species

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Volatile Organic Compounds Emitted by the Biocontrol Agent Pythium oligandrum Contribute to Ginger Plant Growth and Disease Resistance

Cited by 7 publications

References 92 publications

Biological Control of a Root-Knot Nematode Meloidogyne incognita Infection of Tomato (Solanum lycopersicum L.) by the Oomycete Biocontrol Agent Pythium oligandrum

Biological Control of a Root-Knot Nematode Meloidogyne incognita Infection of Tomato (Solanum lycopersicum L.) by the Oomycete Biocontrol Agent Pythium oligandrum

Implications in Phytohormone Research: From Lab to Field

Applications of Pythium- and Phytophthora-produced volatiles in plant disease control

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