Improved genotypes and fertilizers, not fallow duration, increase cassava yields without compromising arbuscular mycorrhizal fungus richness or diversity
| Autor: | Gerrit Peeters, Thanni Bolaji, Damas Birindwa, Pieterjan De Bauw, Margaux Boeraeve, Roel Merckx, Wivine Munyahali, Olivier Honnay |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Agroecosystem Manihot Genotype Field experiment Plant Science engineering.material Biology 010603 evolutionary biology 01 natural sciences Plant Roots Crop Mycorrhizae Genetics Fertilizers Molecular Biology Ecology Evolution Behavior and Systematics Soil Microbiology Nutrient management business.industry fungi food and beverages General Medicine Agronomy Agriculture engineering Fertilizer Species richness business 010606 plant biology & botany |
| Zdroj: | Mycorrhiza. 31(4) |
| ISSN: | 1432-1890 |
| Popis: | Arbuscular mycorrhizal fungi (AMF) are ubiquitous in agroecosystems, but their role in mediating agricultural yield remains contested. Field experiments testing effects of realistic agronomic practices of intensification on AM fungus composition and yields are scarce, especially in the low-input systems of sub-Saharan Africa. A large, full-factorial field experiment was conducted in South-Kivu (DR Congo), testing effects of fallow duration (6 vs. 12 months), genotype (landrace vs. improved), and fertilizer management (control vs. five combinations omitting N, P, K, and/or secondary macro- and micronutrients) on yields of cassava, an important staple crop strongly colonized by AMF. Furthermore, we used DNA-metabarcoding to evaluate effects of these agronomic practices on the AM fungal communities on the roots. The shorter fallow duration strongly increased diversity and richness of AMF, but this did not correspond with increased yields. Cassava yield was mainly determined by genotype, being largest for the improved genotype, which coincided with a significantly higher sum of AM fungal sequences. Effects of fertilizer or genotype on community composition were minor to absent. We found no evidence that increased AMF richness and diversity enhanced cassava yields. In contrast, the use of the improved genotype and mineral fertilizers strongly benefitted yields, without compromising richness or diversity of AMF. Cassava-AMF associations in this work appear robust to fertilizer amendments and modern genotype improvement. ispartof: Mycorrhiza vol:31 issue:4 pages:1-14 ispartof: location:Germany status: Published online |
| Databáze: | OpenAIRE |
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