干旱区生态环境知识资源中心(Arid): Effect of Epichloe endophyte-tall fescue symbiosis on rhizosphere aggregate stability and quality indicators under oxygen-limited conditions

Arid

DOI	10.1016/j.geoderma.2020.114624
	Effect of Epichloe endophyte-tall fescue symbiosis on rhizosphere aggregate stability and quality indicators under oxygen-limited conditions
	Saedi, T.; Mosaddeghi, M. R.; Sabzalian, M. R.; Mamedov, A., I
通讯作者	Mosaddeghi, MR
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2021
卷号	381
英文摘要	Endophytic fungus-tall fescue symbiosis can improve the rhizosphere physical quality, but contribution of oxygen-limited conditions on this change, particularly in semiarid and arid regions has not been established yet. Therefore, the objective of this study was to evaluate the effects of endophyte-tall fescue symbiosis on the rhizosphere quality indicators under different aeration conditions in a greenhouse pot experiment. The treatments were seven levels of air-filled porosity, AFP (0, 0.025, 0.050, 0.750, 0.100, 0.125 and 0.150 m(3 )m(-3)) in a sandy loam soil, and two genotypes (75C and 75B) of tall fescue (Festuca arundinacea = Schedonorus arundinaceus Schreb.) each with endophytic fungus Epichloe coenophiala (E+) and without endophyte (E-). Soil biophysical properties were determined on the intact soil aggregates from rhizosphere zone: structural stability (by HEMC, high energy moisture characteristic), percent of water-stable aggregates, water repellency, basal soil respiration and soil organic matter. The results showed that by decreasing the AFP, and reducing redox potential to < 300 mV, (i) all biophysical indices, and the activity and population of soil microorganisms (especially fungi) significantly decreased, (ii) the role of biological and chemical aggregators was reduced and soil structure degradation was intensified, and (iii) aggregate stability indices and water repellency were associated with the quality of soil organic matter, rather than its quantity. Soil structural stability under genotype 75B was higher and lower than genotype 75C for the oxygen-limited and non-limited conditions, respectively. Stability indices, water repellency and soil organic matter content were greater in the rhizosphere of E+ plants compared to E-ones. No significant differences were observed for the HEMC stability indices between 75B and 75C genotypes for E+ plants, whereas for the E- plants, they were significantly greater in genotype 75C. Endophytic fungi increased the rhizosphere aggregate stability through the water-repellent exudates, extension of root system and enhanced organic carbon storage especially under oxygen-limited conditions.
英文关键词	Rhizosphere Epichloe endophyte Air-filled porosity High energy moisture characteristic Water-stable aggregates Soil water repellency
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000582381600006
WOS关键词	SOIL ORGANIC-MATTER ; WATER-REPELLENCY ; HYDRAULIC CONDUCTIVITY ; REDOX ; INFECTION ; DYNAMICS ; CARBON ; CLAY ; FRACTIONS ; DRAINAGE
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327941
作者单位	[Saedi, T.; Mosaddeghi, M. R.] Isfahan Univ Technol, Coll Agr, Dept Soil Sci, Esfahan 8415683111, Iran; [Sabzalian, M. R.] Isfahan Univ Technol, Coll Agr, Dept Agron & Plant Breeding, Esfahan 8415683111, Iran; [Mamedov, A., I] Tottori Univ, Fac Agr, Arid Land Res Ctr, Tottori 668000, Japan
推荐引用方式 GB/T 7714	Saedi, T.,Mosaddeghi, M. R.,Sabzalian, M. R.,et al. Effect of Epichloe endophyte-tall fescue symbiosis on rhizosphere aggregate stability and quality indicators under oxygen-limited conditions[J],2021,381.
APA	Saedi, T.,Mosaddeghi, M. R.,Sabzalian, M. R.,&Mamedov, A., I.(2021).Effect of Epichloe endophyte-tall fescue symbiosis on rhizosphere aggregate stability and quality indicators under oxygen-limited conditions.GEODERMA,381.
MLA	Saedi, T.,et al."Effect of Epichloe endophyte-tall fescue symbiosis on rhizosphere aggregate stability and quality indicators under oxygen-limited conditions".GEODERMA 381(2021).