Communities of Arbuscular Mycorrhizal Fungi in Pyrus pyrifolia var. culta (Japanese Pear) and an Understory Herbaceous Plant Plantago asiatica

Summary

This research examined the relationship between Japanese pear trees and common lawn plants in orchards, specifically looking at beneficial fungi that help both plants acquire nutrients. The study found that these fungi can form networks connecting orchard trees and surrounding plants, potentially benefiting both. This has practical implications for orchard management: • Natural ground cover plants could help maintain healthy fungal communities that benefit fruit trees • Reducing excessive fertilizer use may help preserve these beneficial fungal relationships • Understanding these plant-fungal partnerships could lead to more sustainable orchard practices • Maintaining diverse plant species in orchards may improve overall ecosystem health • This research could help farmers reduce chemical inputs while maintaining productivity

Background

Arbuscular mycorrhizal fungi (AMF) form mutualistic associations with most plant species and promote growth through improved mineral nutrient uptake, particularly phosphorus. In orchards, excessive fertilization often leads to high soil phosphorus levels which can reduce AMF colonization. Various herbaceous plants found around orchard trees may serve as hosts for AMF communities that could benefit the trees.

Objective

To investigate the AMF communities in the fine roots of Japanese pear (Pyrus pyrifolia var. culta) and an understory herbaceous plant (Plantago asiatica) to understand their relationship in AMF symbioses and determine if they share AMF communities that could allow herbaceous plants to function as AMF inoculum sources for orchard trees.

Results

The study identified 23 AMF phylotypes, with 12 phylotypes including AMF from both host plants. Most sequences (689/811) were affiliated with these shared phylotypes. Host plant species did not significantly affect AMF phylotype distribution, while sampling site and soil properties did. The mean observed overlap of AMF phylotypes between paired hosts (27.1%) was significantly higher than random chance (14.2%). Identical AMF sequences were found in both plants in 8 of 12 soil cores.

Conclusion

Pyrus pyrifolia and Plantago asiatica share significant AMF communities in orchard environments, suggesting that understory herbaceous plants may function as AMF inoculum sources for orchard trees. This relationship could be important for maintaining AMF networks in orchard ecosystems.
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