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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 1087-1098.doi: 10.19802/j.issn.1007-9084.2020207

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Response of sesame root exudates at different growing stages to continuous cropping and its autotoxicity

Feng-juan LYU(), Zhi-hua ZHANG, Rui-qing WANG, Zhan-qi YUAN, Hong-xin LIN, Lin-gen WEI(), Yun-ping XIAO()   

  1. Soil and Fertilizer & Resources and Environment Institute, Jiangxi Academy of Agricultural Sciences, Key Laboratory of Crop Ecophysiology and Farming System for the Middle and Lower Reaches of the Yangtze River, Ministry of Agriculture and Rural Affairs, National Engineering and Technology Research Center for Soil Improvement, Nanchang 330200, China
  • Received:2020-07-13 Online:2021-12-22 Published:2021-12-23
  • Contact: Lin-gen WEI,Yun-ping XIAO E-mail:fengjuanlv@126.com;lgw0021@163.com;xyp-801@163.com;lgw0021@163.com

Abstract:

The objective of this study was to explore the potential allelochemicals in sesame root exudates that might cause sesame continuous cropping obstacles. Cultivar Jinhuangma was selected as material during budding, blooming and maturing stages under normal rotation (CK) and continuous cropping (CC). Sesame root exudates showed "low promotion and high inhibition" to seed germination. 18 to 28 organic compounds were identified in sesame root exudates at budding, blooming and maturing stages under CK and CC treatments. Sesame root exudates at budding and blooming stages contained esters, hydrocarbons, acids, phenols, amines, alcohols and ketones. Among them, the relative abundance of trans-(2,3-diphenylcyclopropyl)-methyl phenyl sulfoxide was the highest. Polyethers were found at maturing stage, but not at budding and blooming stages. The relative abundance of octaethyleneglycol monododecylether at maturing stage was the highest. Esters was important part in sesame root exudates, with the total relative abundance to 75.12% (CK) and 52.96% (CC) respectively at budding stage. Compared to CK, the relative abundance of diisooctyl phthalate and octaethyleneglycol monododecylether was 9.48 and 5.73 percentage points higher in root exudates of continuous cropping sesame. As the main source of allelochemicals, acidic substances had the highest content in root exudates at maturing stage. The total relative abundance of acids reached to 17.53% and 42.71% in exudates under CK and CC treatments respectively. Compared to CK, the relative abundances of palmitic acid, linoleic acid and stearic acid were higher by 15.78, 1.33 and 1.15 points respectively. Both oleic acid and myristic acid were detected in root exudates of continuous cropping sesame only, with the relative abundance of 10.66 and 1.62 points respectively. Compared with CK, the relative abundance of erucamide was 21.68 and 11.51 points higher at budding and blooming stages in the continuous cropping sesame root exudate, while the corresponding oleic acid amide was 2.16 and 7.44 points higher respectively. In summary, continuous cropping changed the compounds of sesame root exudates.

Key words: sesame, continuous cropping, root exudates, allelochemical, growing stage

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