Department of Microbiology and Plant Pathology, Tree Protection Cooperative Programme, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria 0002, South Africa;
Persoonia. 2009 Dec;23:41-7. doi: 10.3767/003158509X471052. Epub 2009 Aug 12.
Calonectria (Ca.) species and their Cylindrocladium (Cy.) anamorphs are well-known pathogens of forest nursery plants in subtropical and tropical areas of the world. An investigation of the mortality of rooted Pinus cuttings in a commercial forest nursery in Colombia led to the isolation of two Cylindrocladium anamorphs of Calonectria species. The aim of this study was to identify these species using DNA sequence data and morphological comparisons. Two species were identified, namely one undescribed species, and Cy. gracile, which is allocated to Calonectria as Ca. brassicae. The new species, Ca. brachiatica, resides in the Ca. brassicae species complex. Pathogenicity tests with Ca. brachiatica and Ca. brassicae showed that both are able to cause disease on Pinus maximinoi and P. tecunumanii. An emended key is provided to distinguish between Calonectria species with clavate vesicles and 1-septate macroconidia.
钙壳孢属（Ca.）物种及其旋孢腔菌（Cy.）无性型是世界亚热带和热带地区森林苗圃植物的知名病原体。对哥伦比亚一家商业苗圃中生根松插条死亡率的调查导致分离出两种钙壳孢属的旋孢腔菌无性型。本研究的目的是使用 DNA 序列数据和形态比较来鉴定这些物种。鉴定出两个物种，一个是未描述的物种，另一个是纤细旋孢腔菌，它被归为钙壳孢属的 Ca. brassicae。新种 Ca. brachiatica 存在于 Ca. brassicae 种复合体中。Ca. brachiatica 和 Ca. brassicae 的致病性试验表明，两者均能引起辐射松和锥果松的病害。提供了一个修订的关键，用于区分具有棒状泡囊和 1 个隔膜大分生孢子的钙壳孢属物种。
