Mycorrhiza ( IF 3.3 ) Pub Date : 2021-06-26 , DOI: 10.1007/s00572-021-01039-0 Pieterjan De Bauw 1 , Damas Birindwa 1, 2 , Roel Merckx 1 , Margaux Boeraeve 3 , Wivine Munyahali 2 , Gerrit Peeters 3 , Thanni Bolaji 3 , Olivier Honnay 3
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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.
Graphical abstract
中文翻译：
改良的基因型和肥料，而不是休耕期，在不影响丛枝菌根真菌丰富度或多样性的情况下增加木薯产量
丛枝菌根真菌 (AMF) 在农业生态系统中无处不在，但它们在调节农业产量方面的作用仍然存在争议。田间试验测试集约化的现实农艺实践对 AM 真菌组成和产量的影响很少，特别是在撒哈拉以南非洲的低投入系统中。在南基伍省（刚果民主共和国）进行了一项大型全因子田间试验，测试休耕期（6 个月与 12 个月）、基因型（地方品种与改良品种）和肥料的影响 管理（对照与省略 N、P、K 和/或次要常量和微量营养素的五种组合）对木薯产量的影响，木薯是 AMF 强烈定殖的重要主粮作物。此外，我们使用 DNA 元条形码来评估这些农艺实践对根部 AM 真菌群落的影响。较短的休耕时间大大增加了 AMF 的多样性和丰富度，但这与增加的产量并不相符。木薯产量主要由基因型决定，改良基因型最大，这与显着更高的 AM 真菌序列总和相吻合。的影响肥料或基因型对社区组成的影响很小到不存在。我们没有发现任何证据表明增加 AMF 丰富度和多样性会提高木薯产量。相比之下，使用改良的基因型和矿物肥料极大地提高了产量，而不会影响 AMF 的丰富度或多样性。这项工作中的木薯-AMF 关联似乎对肥料改良和现代基因型改进很有效。
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