两种基因型大豆根分泌物对大豆根腐病菌的化感作用

采用生物模拟试验、化学分析等方法,研究了两种大豆基因型(9536、吉林30)的根分泌物中的糖、氨基酸、有机酸组分对大豆根腐病菌的化感作用.结果表明,两种大豆基因型(9536、吉林30)根分泌物糖组分表现出低浓度显著促进、高浓度显著抑制半裸镰孢菌、尖镰孢菌生长的规律,对粉红粘帚菌的生长影响不明显;氨基酸组分对上述三种病原菌所表现出的促进、抑制规律不同,9536基因型根分泌物氨基酸组分的中、高浓度处理对半裸镰孢菌、粉红粘帚菌、尖镰孢菌的生长表现出显著的抑制作用,而吉林30多表现出显著的促进作用;有机酸组分对半裸镰孢菌、粉红粘帚菌、尖镰孢菌生长都有显著的抑制作用.两种基因型大豆根分泌物(糖、氨基酸、有机酸组分)与根腐病害发生密切相关,大豆基因型不同,根分泌物对根腐病菌的化感促进或抑制作用有差异.

Allelopathy of root exudates from two genotypes soybeans on root rot pathogenic fungi

With biological simulation experiment and chemical analysis,this paper studied the allelopathy of carbohydrates,amino acids and organic acids in the root exudates from two genotypes soybeans (9536 and Jilin 30) on the pathogenic fungi of root rot.The results showed that the water soluble carbohydrates in the root exudates from test soybeans significantly promoted the growth of Fusarium oxysporium and Fusarium semitectum at low concentrations and inhibited their growth at high concentrations,but had no evident influence on Gliocladium roseum.The water soluble amino acids from the root exudates demonstrated different actions, i.e.,at middle and high concentrations,those from 9536 significantly inhibited the growth of Fusarium oxysporium,Fusarium semitectum and Gliocladium roseum,while those from Jilin 30 mostly promoted their growth.The organic acids from the root exudates of 9536 and Jilin 30 significantly inhibited the growth of Fusarium oxysporium,Fusarium semitectum and Gliocladium roseum.It's suggested that there existed interactions between the root exudates of the two genotypes soybeans and the pathogenic fungi of root rot.Different genotypes of soybean may have different allelopathy on pathogenic fungi of root rot.