Allelopathic effects of root exudates of Chinese onion on tomato growth and the pathogen Fusarium oxysporum(Sch1) f.sp lycopersici

作者：Liu, Shuqin; Wu, Fengzhi^*; Wen, Xiangying

来源：Allelopathy Journal, 2013, 31(2): 387-403.

• Chinese onion
• root exudates
• allelopathy
• ISSR
• F. oxysporum f.sp lycopersici

Fusarium wilt [caused by Fusarium oxysporum (Sch1) f.sp. lycopersici (Sacc.) Snyder et Hansen] is a serious soil-borne disease of tomato worldwide, especially in continuous monocropping. Rotations with Chinese onion [Allium. cepa L. var. aggregatum G. Don (syn. var. multipilcans Bailey)] improved the tomato growth and reduced the occurrence of Fusarium wilt. We investigated the mechanism underlying this phenomenon. Root exudates of 47 accessions of Chinese onion were assayed for effects on germination and seedling growth of tomatoes in the laboratory and field. Genetic similarity of accessions was determined using ISSR-PCR technique. Allelopathic potential of root exudates of onion different accessions were also assayed on F. oxysporum f.sp lycopersici. The root exudates of most Chinese onion accessions stimulated the seedling growth of tomato. The allelopathic potential was accession dependent, and not correlated to DNA-fingerprinting. Two pairs of accessions, 'Sui Hua-Ning An Hongcheng' and 'Wu Chang Hongqishe-Qi Tai He II' with similar DNA-fingerprints but with different allelopathic potential were screened. Their root exudates inhibited the spore germination, mycelial growth, biomass and sporulation of F. oxysporum f.sp lycopersici. Sui Hua and Wu Chang Hongqishe was more inhibitory to pathogen than Qi Tai He II and Ning An Hongcheng(except biomass) (p < 0.05). Our results suggested that in crop rotations, the root exudates of Chinese onion accessions promoted the tomato growth and decreased the incidence of Fusarium wilt. The accession Sui Hua and Wu Chang Hongqishe decreased the incidence of pathogen and thereby improve the tomato yield.

• 出版日期2013-4
• 单位东北农业大学