硅酸钠及其对应pH值对油茶炭疽病菌抑菌效果研究  

Study on the antifungal effect of sodium silicate and its corresponding pH value on Camellia anthracnose pathogen

作　　者：连娇娇 李忠[1,2,3,4] 刘君昂 周国英[1,2,3,4] LIAN Jiaojiao;LI Zhong;LIU Junang;ZHOU Guoying(Central South University of Forestry and Technology,Changsha 410004,China;Key Laboratory of National Forestry and Grassland Administration on Control of Artificial Forest Diseases and Pests in South China,Changsha 410004,China;Hunan Provincial Key Laboratory of Forest Pest Control,Changsha 410004,China;The Ministry of Education jointly established the Key Laboratory of Economic Forest Cultivation and Protection,Changsha 410004,China)

机构地区：[1]中南林业科技大学,长沙410004 [2]南方人工林病虫害防控国家林业和草原局重点实验室,长沙410004 [3]森林有害生物防控湖南省重点实验室,长沙410004 [4]经济林培育与保护省部共建教育部重点实验室,长沙410004

出　　处：《植物病理学报》2023年第6期1148-1157,共10页Acta Phytopathologica Sinica

基　　金：湖南省林业科技创新资金项目(XLK202101-2);湖南省油茶产业科研示范项目(湘财资环指[2021]9);中央财政林业科技推广示范资金项目([2022]XT18)。

摘　　要：油茶炭疽病是油茶主要病害之一,化学防治是目前最主要的防治措施,但农药的使用造成环境污染等问题。本文研究了不同浓度硅酸钠、不同浓度硅酸钠对应pH和不同浓度硅酸钠pH=6.7时对油茶炭疽病菌孢子萌发、菌落直径和菌丝生长的影响;不同浓度硅酸钠灌根和叶面喷施处理后接种,观察植株发病情况和防御酶活性变化。结果表明,三组处理均能抑制油茶炭疽病菌的生长,其中不同浓度硅酸钠处理组对油茶炭疽病菌的抑制效果最好,20 mmol·L^(-1)硅酸钠处理的孢子萌发抑制率为84.02%,菌落直径抑制率为77.61%。在灌根处理中,经15 mmol·L^(-1)硅酸钠处理的油茶叶片病斑直径最小;在喷施处理中硅酸钠浓度在1.5 mmol·L^(-1)时病斑直径最小。油茶经不同浓度硅酸钠和不同处理方式接种后,油茶体内防御酶活性均有变化。Camellia anthracnose is one of the main diseases on C.oleifera,which is mainly managed by chemical control.However,the use of fungicide had caused many problems,such as environmental pollution and outbreaks of fungicide-resistance strains.In this study,the effects of different concentrations of sodium silicate,different concentrations of sodium silicate correspond to pH,and different sodium silicate concentration pH=6.7 were investigated on the germination of spores,colony diameter,and hyphal growth of C.oleifera anthracnose,pathogenesis and changes of defensive enzyme activity under artificial inoculation conditions after root irrigation and foliar spraying of sodium silicate at different concentrations.The results showed that three groups of treatments could inhibit the growth of C.oleifera anthracnose pathogen,among which the different concentrations of sodium silicate treatment group had the best inhibition effect on C.oleifera anthracnose pathogen,and the spore germination inhibition rate of 20 mmol·L^(-1) sodium silicate treatment was 84.02%and the colony diameter inhibition rate was 77.61%.In the root irrigation treatment,the diameter of the disease spots on C.oleifera leaves treated with 15 mmol·L^(-1) sodium silicate was the smallest.The lesion diameter was the smallest when the sodium silicate concentration was 1.5 mmol·L^(-1) during spraying.After inoculation of different concentrations of sodium silicate and different treatment methods,the defensive enzyme activities of C.oleifera changed.

关 键 词：油茶炭疽病 硅酸钠 PH 抑制 

分 类 号：S432.44[农业科学—植物病理学]