In the rhizosphere, the role of yeasts in microbial interactions and signaling is an open question. To study the influence of fungicides on yeast inactivation of N-acyl homoserine lactone quorum sensing signals, we evaluated the resistance of Papiliotrema laurentii strains from tomato rhizosphere to CuSO₄ and Cu₂(OH)₃Cl fungicides, and the copper effect on yeast quorum quenching. Copper resistance profiles and colony morphologies allowed the distinction of two groups of P. laurentii strains: mucoid, green and resistant, and brown-orange and more sensitive. Most of the strains inactivated C6-HSL and C10-HSL QS signals. Inactivation and copper divided the strains in three with weak activity independently of the metal, and 11 with activities affected by copper. The lack of alkalinization allows the hypothesis of an enzymatic inactivation of the signals. These results suggest that yeasts contribute to communications in the rhizosphere, and that copper fungicides can modify their interactions with other rhizosphere microorganisms.

在根际中，酵母在微生物相互作用和信号传导中的作用是一个悬而未决的问题。为了研究杀真菌剂对N-酰基高丝氨酸内酯内酯群体感应信号的酵母失活的影响，我们评估了番茄根际的劳氏凤蝶菌株对CuSO ₄和Cu ₂（OH）₃ Cl杀真菌剂的抗性，以及铜对酵母群体的影响。淬火。铜抗性概况和菌落形态允许区分劳伦对虾的两组菌株：粘液样，绿色和抗性，棕橙色，更敏感。大多数菌株使C6-HSL和C10-HSL QS信号失活。灭活和铜将菌株分为三类，其活性与金属无关，而活性较弱，而11种则受铜影响。碱化的缺乏允许对信号进行酶灭活的假设。这些结果表明，酵母有助于根际中的通讯，铜杀真菌剂可以改变其与其他根际微生物的相互作用。