Biodiversity of Culturable Endophytic Actinobacteria Isolated from High Yield Camellia oleifera and Their Plant Growth Promotion Potential

Ting Xu, Kunpeng Cui, Jiawei Chen, Rui Wang, Xiangnan Wang, Longsheng Chen, Zhen Zhang, Zhilong He, Caixia Liu, Wei Tang, Yonghua Zhu and Yongzhong Chen
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Ting Xu: Hunan Academy of Forestry, Changsha 410004, China
Kunpeng Cui: Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha 410082, China
Jiawei Chen: Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha 410082, China
Rui Wang: Hunan Academy of Forestry, Changsha 410004, China
Xiangnan Wang: Hunan Academy of Forestry, Changsha 410004, China
Longsheng Chen: Hunan Academy of Forestry, Changsha 410004, China
Zhen Zhang: Hunan Academy of Forestry, Changsha 410004, China
Zhilong He: Hunan Academy of Forestry, Changsha 410004, China
Caixia Liu: Hunan Academy of Forestry, Changsha 410004, China
Wei Tang: Hunan Academy of Forestry, Changsha 410004, China
Yonghua Zhu: Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha 410082, China
Yongzhong Chen: Hunan Academy of Forestry, Changsha 410004, China

Agriculture, 2021, vol. 11, issue 11, 1-14

Abstract: Camellia oleifera Abel. is one of the world’s four famous woody oil trees and has drawn increasing attention because of its high commercial value. Endophytes are microorganisms inhabiting inside plant tissues, and their functions vary with the change of host status and environmental parameters. To deepen our understanding of the interactions between C. oleifera and their endophytic actinobacteria, the present study investigated the four endophytic actinobacterial composition-residing high-yield C. oleifera trees. A total of 156 endophytic actinobacterial isolates were obtained distributed in 17 genera. Among them, Streptomyces was the dominant endophytic actinobacteria, followed by Nocardia , Amycolatopsis , Microbiospora , Micromonospora and other rare actinobacteria genera. Soil characteristics including soil pH and organic matter were found to play crucial roles in shaping the endophytic actinobacterial community composition. Furthermore, all isolates were studied to determine their plant growth-promotion traits, 86.54% could produce Indole 3-Acetic Acid, 16.03% showed nitrogen-fixing, 21.15% showed phosphorus solubilizing, and 35.26% produced siderophore. Under the glasshouse condition, some isolates exhibited growth promotion effects on C. oleifera seedlings with significant increase in spring shoot length and ground diameter. Altogether, this study demonstrated that C. oleifera plants harbored a high diversity and novelty of culturable endophytic actinobacteria, which represent important potential as natural biofertilizers for the high production of C. oleifera .

Keywords: Camellia oleifera; endophytic actinobacteria; biodiversity; plant growth promotion (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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