Novel culture chamber to evaluate in vitro plant-microbe volatile interactions: Effects of Trichoderma harzianum volatiles on wheat plantlets

• Published in: Plant science (Limerick) 2022-07, Vol.320, p.111286-111286, Article 111286
• Main Authors: Álvarez-García, Samuel, Manga-Robles, Alba, Encina, Antonio, Gutiérrez, Santiago, Casquero, Pedro A.
• Format: Article
• Language: English
• Subjects: BVOC; Plant-microbe VOC Chamber; Trichoderma; Trichodiene; Volatile Organic Compounds; Wheat
• ISSN: 0168-9452; 1873-2259
• DOI: 10.1016/j.plantsci.2022.111286

The field of plant-microbe interactions mediated by Biogenic Volatile Organic Compounds (BVOCs) still faces several limitations due to the lack of reliable equipment. We present a novel device designed to evaluate in vitro plant-microbe volatile interactions, the plant-microbe VOC Chamber. It was tested by evaluating the effects exerted on wheat development by volatiles from three Trichoderma harzianum strains, a wild type and two genetically modified strains; one expressing the tri5 gene, which leads to the synthesis and emission of the volatile trichodiene, and the other by silencing the erg1 gene, impairing ergosterol production. The wild type and the erg1-silenced strain enhanced fresh weight and length of the aerial part, but reduced root dry weight. Interestingly, no differences were found between them. Conversely, the tri5-transformant strain reduced root and aerial growth compared to the control and the other strains. No differences were observed regarding chlorophyll fluorescence quantum yield and leaf chlorophyll content, suggesting that the released BVOCs do not interfere with photosynthesis. The plant-microbe VOC Chamber proved to be a simple and reliable method to evaluate the in vitro effects of microbial BVOCs on plant development, perfect for the screening of microorganisms with interesting volatile traits. [Display omitted] •P-mVOC Chambers are a reliable method to test plant-microbe volatile interactions.•Trichoderma harzianum volatiles affect wheat plantlets growth and development.•erg1 silencing does not modify T. harzianum volatile effects on wheat plantlets.•T. harzianum tri5 volatiles reduce root and aerial growth of wheat plantlets.