福建农林大学学报（自然科学版）2025，Vol.54Issue(4)：455-463,9.DOI:10.13323/j.cnki.j.fafu(nat.sci.).202412010
太子参酸腐病病原菌白地霉的侵染特性
Infection characteristics of pathogen Geotrichum candidum causing sour rot of Pseudostellaria heterophylla
摘要
Abstract
[Objective]The infection characteristics of Geotrichum candidum,a pathogen causing sour rot of Pseudostellaria hetero-phylla,was clarified to provide the basis for the prevention and control of P.heterophylla sour rot.[Method]Artificial inoculation ex-periments were conducted to determine the incidence and disease index of sour rot in P.heterophylla roots inoculated with G.candi-dum under different temperature,pH,light,humidity and tissue wound conditions.Furthermore,microstructure changes of P.het-erophylla root tubers at different disease stages after infection were observed using microscopy.[Result]The optimum temperature and pH for the infection of G.candidum were 28-30℃and pH 6-8;the infection was facilitated when relative humidity was high or root tubers were subjected to tissue trauma;alternate light-dark regime only exerted certain promotive effect at the early stage of in-fection.Moreover,microscopic examination indicated that the infection started with the attachment of G.candidum spores to the sur-face layer of P.heterophylla root tubers for the subsequent germination of bud tubes and mycelia;then G.candidum mycelia penetra-ted through the cell spaces and cell walls to successively invade the cork layer,cortex,phloem and xylem of P.heterophylla root tu-bers from the outside to the inside;finally,dense and meshy mycelia were developed through continuous propagation,which eventu-ally led to the decay and hollowness of whole root tubers by disintegrating the cells of each tissue.[Conclusion]This study elucidated the optimal infection conditions,key pathogenic factors(high humidity and mechanical damage)and dynamic pathogenic procoss of"adhesion-germination-infection-expansion"during the infection of G.candidum towards P.heterophylla tuberous roots,and the cor-responding histopathological changes in P.heterophylla tuberous roots.关键词
太子参/酸腐病/白地霉/发病条件/致病过程Key words
Pseudostellaria heterophylla/sour rot/Geotrichum candidum/conditions for disease development/pathogenesis分类
植物保护学引用本文复制引用
陈燕萍,陈梅春,肖荣凤,郑雪芳,刘波,王阶平..太子参酸腐病病原菌白地霉的侵染特性[J].福建农林大学学报（自然科学版）,2025,54(4):455-463,9.基金项目
福建省自然科学基金项目(2022J01486). （2022J01486）
