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| Effects of Root Exudates of Different Wheat Varieties on Cucumber Growth，Fusarium Wilt Occurrence and Pathogenic Bacteria |
| DONG Hang1，WU Jinbao2，QIN Kai2，JIANG Zhen2，FU Lianshuang3，LYU Shuang4*，LIU Shouwei2*，WU Fengzhi2 |
| 1Mudanjiang Branch，Heilongjiang Academy of Agricultuial Science，Mudanjiang 157000，Heilongjiang，China；2School of Horticulture and Landscape，Northeast Agricultural University，Harbin 150030，Heilongjiang，China；3College of Agriculture，Northeast Agricultural University，Harbin 150030，Heilongjiang，China；4Heilongjiang Agricultural Engineering Vocational College，Harbin 150025，Heilongjiang，China |
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Abstract Taking cucumber variety ‘Jinqiu No.1’ as test material，this paper studied the effects of different wheat varieties’root exudates on cucumber growth and Fusarium wilt occurrence using potted way．Meanwhile，the paper also studied the effect of root secretion on cuccumber Fusarium wilt pathogen growth and development by dish culture method．The results indicated that the Fusarium wilt incidences of cucumber treated by X04 and X12 wheat root exudates were all significantly lower than that of the contrast；and disease indexes of cucumber treated by X01，X02，X03，X04，X05，X08，X09，X10 and X12 root exudates were all significantly lower than that of the contrast．The control effects were all over 45%．Among the treatments of each variety，the disease incidence rate and disease index of cucumber treated by X04 were the lowest and control efficiency was the best．The plant height，stem thickness，dry weight of above-ground and whole plant of cucumber treated by X01，X02，X03，X04，X05，X06，X08，X09，X10 and X12 root exudates were all significantly higher than that of the contrast．Except for X11，X14 and X15 root exudates treatments，above-ground and whole plant fresh weight of cucumber treated by the rest wheat varieties were all significantly higher than that of the contrast．Among treatments of each variety，all growth indexes of cucumber treated with X04 root exudates were the highest．The colony diameters，biomasses，spore germination rates and spore yields of Fusarium wilt in pathogen from cucumber treated by X01，X02，X03，X04，X09 and X12 root exudates all were significantly lower than that of the contrast．Among the treatments of each variety，the colony diameter treated by X03 was the smallest，the spore germination rates treated by X01，X03 and X04 were lower，and the biomasses and spore yields treated by X04 were the lowest．Summing up the above，4 kinds of wheat root exudates，namely X01，X04，X09 and X12 had better effects in inhibiting the occurrence of cucumber Fusarium wilt and growth and development of pathogenic bacteria．Besides，they also had certain effect in promoting cucumber growth．Among them，X04 had the best effect．
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Received: 25 February 2022
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