Potential to breed for mycorrhizal association in durum wheat

Canadian Journal of Microbiology
Walid EllouzeA K Singh

Abstract

The selection of genotypes under high soil fertility may alter the effectiveness of mycorrhizal symbioses naturally forming between crop plants and the mycorrhizal fungi residing in cultivated fields. We tested the hypothesis that the mycorrhizal symbiosis of 5 landraces functions better than the mycorrhizal symbiosis of 27 cultivars of durum wheat that were bred after the development of the fertilizer industry. We examined the development of mycorrhiza and the response of these genotypes to mycorrhiza formation after 4 weeks of growth under high and low soil fertility levels in the greenhouse. The durum wheat genotypes were seeded in an established extraradical hyphal network of Rhizophagus irregularis and in a control soil free of mycorrhizal fungi. The percentage of root length colonized by mycorrhizal fungi was lower in landraces (21%) than in cultivars (27%; P = 0.04) and in the most recent releases (29%; P = 0.02), which were selected under high soil fertility levels. Plant growth response to mycorrhiza varied from -36% to +19%. Overall, durum wheat plant breeding in Canada has increased the mycorrhizal development in wheat grown at a low soil fertility level. However, breeding had inconsistent effects on mycorrhizal deve...Continue Reading

References

Dec 3, 1998·Applied and Environmental Microbiology·H VierheiligY Piche
Sep 11, 2009·Proceedings. Biological Sciences·Jeff R PowellHafiz Maherali
Apr 18, 2012·Ecology Letters·Kurt O ReinhartMatthew J Rinella
Sep 3, 2013·Applied and Environmental Microbiology·Mulan DaiDerek Lynch
Sep 24, 2014·BioMed Research International·Walid EllouzeChantal Hamel

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