Bulk Soil
Different maize genotypes and their hybrids seeds were sown in the soil pots with natural soil, low nitrogen and low phosphorus soil, and then the root from the whole primary root were harvested at 7 days. The genomic DNA was isolated from the rhizosphere of those roots and subjected to 16S rRNA gene sequencing. The RNA was isolated from cortex of roots and subjected to transcriptomic sequencing.