Abstract
Piriformospora indica, which is an endophytic fungus that grows on various media in the absence of a host, emits plant growth promoting volatile organic compounds (VOCs). Kaefer medium (KF) has been shown to be the most suitable medium for P. indica growth; however, different media may differentially affect fungal metabolism which may in turn influence the VOC profiles of P. indica. To date, how the VOCs emitted from P. indica cultured on different media affect plant growth has not been well characterized. Here, we show that poor nutrient medium (PNM) promoted the growth of P. indica more effectively than potato dextrose agar (PDA) or KF medium. By contrast, plant total biomass and root fresh weight were increased 1.8-fold and 2.1-fold, when co-cultivated with P. indica cultured on PDA medium in comparison with KF or PNM medium, respectively. Furthermore, sucrose in the plant culture medium downregulated the fold-induction ratio of the plant growth promoted by P. indica VOCs.
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