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Influence of Sugarcane Genotype and Soil Moisture Level on the Arbuscular Mycorrhizal Fungi Community

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Abstract

The relationship between sugarcane genotype and symbiosis with arbuscular mycorrhizal fungi (AMF) remains poorly understood, especially regarding different soil moisture levels. Our objective was to evaluate the effect of soil moisture on the AMF community structure, spore abundance and colonization ratio in a plantation with eight sugarcane genotypes (CTC15, CTC17, RB867515, RB92579, RB931011, RB966928, IAC5000 and NCo376). The study was carried out in Piracicaba, São Paulo and Brazil in an experimental plot setup in a randomized block design, with three replicates (blocks). We collected soil and root samples in a greenhouse experiment under two water replenishment levels: 100 and 50% of soil moisture at field capacity (θFC). We extracted spores and assessed the AMF root colonization ratio by using specific dyes and determining the percentage of root length colonized in the different sugarcane genotypes. In addition, we evaluated the AMF community structure by PCR and denaturing gradient gel electrophoresis. In general, the spore abundance and root colonization ratio were higher in all varieties at 100% θFC. However, the IAC5000 and RB966928 genotypes showed higher colonization levels even at 50% θFC. The AMF community structure was also influenced by soil water levels with group separations across 100 and 50% θFC. Sugarcane productivity as measured by stalk plus root dry mass was positively correlated with AMF colonization rates in 100% θFC. Thus, the water replenishment levels used in sugarcane cultivation can influence spore abundance, colonization ratios and AMF community structure in the soil. The selection of a sugarcane genotype with greater AMF association under low water replenishment levels may be a primary factor in growing sugarcane in areas with low water availability.

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Acknowledgements

This work was supported by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo (Processes No. 2012/50083-7 and USP - ETH-FAPESP:30761).

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Correspondence to Timóteo Herculino da Silva Barros or Rubens Duarte Coelho.

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da Silva Barros, T.H., de Araujo Pereira, A.P., de Souza, A.J. et al. Influence of Sugarcane Genotype and Soil Moisture Level on the Arbuscular Mycorrhizal Fungi Community. Sugar Tech 21, 505–513 (2019). https://doi.org/10.1007/s12355-018-0640-0

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  • DOI: https://doi.org/10.1007/s12355-018-0640-0

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