<i>Didymella pinodes</i> Affects N and P Uptakes and Their Efficiencies in a Tripartite Mutualism of Pea
Getinet Desalegn | Reinhard Turetschek | Stefanie Wienkoop | Hans-Peter Kaul
In pea (<i>Pisum sativum</i> L.) production, <i>Didymella pinodes</i> (Berk. & A. Bloxam) Petr. is the most damaging aerial pathogen globally. In two completely randomized pot experiments with four replicates, we studied the effects of <i>D. pinodes</i> infection interaction with three symbiotic treatments (<i>Rhizobium</i> <i>leguminosarum biovar viciae</i>, arbuscular mycorrhizal fungi (AMF) and co-inoculation of both) and a non-symbiotic control on one or two pea cultivars. Grain yield and yield components of pea, uptakes and physiological efficiencies of N and P and nitrogen fixation were recorded. The results show that there were significant interaction effects among treatments. Therefore, productivity of crops and their uptakes and efficiencies of N and P are dependent on plant health conditions, effectiveness of microbial symbionts and response of pea genotypes. For cv. Protecta inoculated with both symbionts, pathogen infection compared to healthy plants significantly enhanced P acquisition. Overall, plants inoculated with rhizobia alone had higher grain yield by 20⁻30% and nitrogen fixation by 20⁻25% than in dual symbiosis independent of plant health conditions. In conclusion, aerial pathogen, pea genotypes and microbial symbionts interactions modified N and P uptake and their efficiencies, which can lead to improving final grain yield quantity and quality in a sustainable farming system.
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