Solicoccozyma aeria YCPUC79 Promotes Tomato Seedling Root Growth by Volatile Organic Compounds Emission
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Date
2024
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Abstract
Beneficial microorganisms promote plant growth through different mechanisms, such asthe production of plant hormones, the synthesis of 1-aminocyclopropane-1-carboxylic aciddeaminase (ACCD), or, through volatile organic compounds (VOCs) emission. There are numerousstudies describing a biostimulant action mediated by VOCs released by bacteria and filamentousfungi. However, in soil yeasts, research in this regard is still incipient. In a previous study, wepresent the stimulatory action of Solicoccozyma aeria YCPUC79 on tomato seedling growth byinoculating the rootzone with this yeast. The positive effect of S. aeria was related to the synthesis ofindole acetic acid (IAA) and the presence of ACCD activity by the yeast. In the present study, weevaluated whether S. aeria is capable of emitting VOCs with biostimulant activity. For this, anexperiment was conducted to test the release of VOCs in four treatments: S. aeria (Sa), tomatoseedlings (T), tomato seedlings sharing the ambient with S. aeria but with no physical contact (TSa)plus a control with no yeast nor tomato seedlings (C). Tomato seedlings exposed to S. aeria inoculum(TSa) presented 1.2-fold shorter main roots but increased the number of lateral roots by 80%compared to T. Regarding the analysis of VOCs, 59 compounds were identified excluding thosefound in the control treatment. These compounds represent twelve chemical families, includingalcohols, esters, furans, hydrocarbons, ketones and terpenes. The treatment TSa shows an increasedabundance of ketones, alcohols, esters, sulfur-containing compounds, and pyrazines in comparisonto T treatment. Three compounds (butyl hept-4-yl ester-phthalic acid, (E)1.3-pentadiene and 1-propenylthiol) were exclusively present in the TSa treatment. This study provides, for the first time,information on a soil yeast capable of promoting the production of lateral roots in tomato throughVOCs.
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Keywords
Yeast, VOCs, Biostimulants, Root, Tomato seedling