Journal
PHYTON-INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY
Volume 91, Issue 12, Pages 2719-2732Publisher
TECH SCIENCE PRESS
DOI: 10.32604/phyton.2022.021989
Keywords
AMF community; spore identification; edaphic factor; Olea europaea L.
Categories
Funding
- National Natural Science Foundation of China [31760222]
- State Forestry Administration of China 948 Project Introduction of Olive Water and Fertilizer Precise Control Technology [2014-4-23]
- Plant Nutrition and Mycorrhiza Research Discipline Team Building Project of Yunnan Academy of Forestry and Grassland [LKYTD-2018-6]
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Olive trees are important and widely cultivated fruit trees. The olive trees grown in Yunnan Province, China, have a high diversity of AMF, which can be utilized for improving the cultivation efficiency of this crop.
Olive (Olea europaea L.) is one of the most important and widely cultivated fruit trees, with high economic, ecological, cultural and scientific value. China began introducing and cultivating olive in the 1960s, and Yunnan Province is one of the main growing areas. Improving the cultivation and productivity of this tree crop species is an important challenge. Olive is a typical mycotrophic species and the potential of arbuscular mycorrhizal fungi (AMF) for this plant is well recognized; nevertheless, studies of olive AMF in China are still very limited. Roots and rhizosphere soils of olive were sampled from five representative growing sites in the Yunnan Province of China to investigate the AMF colonization status in the root systems, the AMF community in the olive orchards and the edaphic factors influencing the arbuscular mycorrhizal (AM) parameters. Root samples of olive trees from different growing sites generally showed AMF colonization, suggesting that autochthonous AMF manifest a high efficiency in colonizing the roots of olive plants. The spore density on the five sites ranged from 81.6 to 350 spores per 20 g soil. Twenty-three AMF species from 9 genera were identified in total, and Glomeraceae was the dominant family. The findings of our study suggested a high AMF diversity harbored by olive growing in different areas of the Yunnan Province, Southwestern China. Furthermore, the hyphal colonization in roots positively correlated with soil pH and EC. The arbuscule colonization in olive roots negatively correlated with soil pH, EC, OM, TN, TP and AN. The spore density positively correlated with OM, TN, AN, AP and sand content. Finally, the Shannon index of AMF in the rhizosphere soil positively correlated with the clay content, but negatively correlated with soil pH, TN and silt content. The high diversity of autochthonous AMF in Yunnan is promising for screening AMF isolates for utilization in the efficient cultivation of this crop.
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