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Agronomy 2019, 9(2), 52;

Didymella pinodes Affects N and P Uptakes and Their Efficiencies in a Tripartite Mutualism of Pea

Department of Crop Sciences, University of Natural Resources and Life Sciences, Gregor Mendel Strasse 33, Vienna 1180, Austria
Department of Ecogenomics and Systems Biology, University of Vienna, Althanstraße 14, Vienna 1090, Austria
Author to whom correspondence should be addressed.
Received: 13 November 2018 / Revised: 16 January 2019 / Accepted: 23 January 2019 / Published: 26 January 2019
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In pea (Pisum sativum L.) production, Didymella pinodes (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 D. pinodes infection interaction with three symbiotic treatments (Rhizobium leguminosarum biovar viciae, 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. View Full-Text
Keywords: pea; grain yield; aerial pathogen; mycorrhiza; rhizobia; nitrogen; phosphorus pea; grain yield; aerial pathogen; mycorrhiza; rhizobia; nitrogen; phosphorus

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Desalegn, G.; Turetschek, R.; Wienkoop, S.; Kaul, H.-P. Didymella pinodes Affects N and P Uptakes and Their Efficiencies in a Tripartite Mutualism of Pea. Agronomy 2019, 9, 52.

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