Wu Hong-Sheng, Raza Waseem, Fan Jia-Qin, Sun Yong-Gang, Bao Wei, Liu Dong-Yang, Huang Qi-Wei, Mao Ze-Sheng, Shen Qi-Rong, Miao Wei-Guo
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China.
Chemosphere. 2008 Dec;74(1):45-50. doi: 10.1016/j.chemosphere.2008.09.027. Epub 2008 Oct 25.
Salicylic acid, which is biosynthesized inside plant and is often found and accumulated in soil due to plant debris decaying, is considered as a signaling substance during plant-microbe interactions. It is involved in the cycling of biogeochemistry and related to plant resistance to biotic and abiotic stress. The antibiotic effect of salicylic acid on Fusarium oxysporum f.sp.niveum (FON) was studied to investigate the relationships between the salicylic acid and the fungus in the ecological interaction of plant-microbe. Results showed that the biomass, colony diameter, number of conidium germination and conidium production of FON were decreased by 52.0%, 25.7%, 100% and 100% at concentrations of 800 mg L(-1). However, mycotoxin yield was increased by 233%, pectinase activity raised by 168.0% and cellulase activity increased by 1325% compared to control at higher concentrations. It was concluded that salicylic acid as an allelochemical greatly inhibited FON growth and conidia formation and germination, though stimulated mycotoxin production and activities of hydrolytic enzymes by FON.
水杨酸在植物体内生物合成，常因植物残体腐烂而在土壤中被发现和积累，被认为是植物与微生物相互作用过程中的一种信号物质。它参与生物地球化学循环，并与植物对生物和非生物胁迫的抗性有关。研究了水杨酸对西瓜枯萎病菌（FON）的抗菌作用，以探讨水杨酸与该真菌在植物 - 微生物生态相互作用中的关系。结果表明，在800 mg L(-1)浓度下，FON的生物量、菌落直径、分生孢子萌发数和分生孢子产量分别降低了52.0%、25.7%、100%和100%。然而，在较高浓度下，与对照相比，霉菌毒素产量增加了233%，果胶酶活性提高了168.0%，纤维素酶活性增加了1325%。得出的结论是，水杨酸作为一种化感物质极大地抑制了FON的生长、分生孢子形成和萌发，尽管刺激了FON的霉菌毒素产生和水解酶活性。
