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.
Highlights
Camellia oleifera Abel., a member of the Theaceae, is an edible oil tree species of China
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Summary
Camellia oleifera Abel., a member of the Theaceae, is an edible oil tree species of China. It is widely distributed in southern China especially in Hunan, Jiangxi and Guangxi province [1,2]. C. oleifera has a long high-yielding period (approximately one hundred years), and the secondary metabolites it produces, such as camellia seed oil, saponins, polyphenols and flavonoids, are widely used in daily life [3]. Camellia seed oil, well known as “eastern olive oil” [4], contains more than 90% unsaturated fatty acid content and can boost human immunity, reduce blood pressure, prevent cardiovascular and cerebrovascular diseases [5,6]. To develop the great value of this excellent economic and ecological tree, the exploration of the relationship between C. oleifera and associated microorganisms, and the management involved plant microbiome selection, are gaining increasing interests for plant traits improvement [9]
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