Evaluation of pathogenicity and aggressiveness of F. langsethiae on oat and wheat seedlings relative to known seedling blight pathogens
Evaluation of pathogenicity and aggressiveness of F. langsethiae on oat and wheat seedlings relative to known seedling blight pathogens
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DOI：
10.1007/s10658-009-9533-0
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发表时间：
2010-02-01
影响因子：
1.8
通讯作者：
Edwards, Simon G.
中科院分区：
文献类型：
--
作者：
Imathiu, Samuel M.;Hare, Martin C.;Edwards, Simon G.
镰刀菌属（Fusarium）和微孢菌属（Microdochium）物种是小粒谷类作物的幼苗枯萎病的病原体，其中它们可能导致作物建立和最终产量的显著降低。本研究通过两个试验探讨了该菌的致病性和攻击性。langsethiae，一种最近鉴定的真菌，与具有高水平的麦角烯真菌毒素HT-2和T-2的谷物污染有关。使用涉及分生孢子悬浮液的人工种子接种方法，并在设定为5或15 A ° C的生长箱中进行实验，光周期为12小时。使用镰刀菌属和Microdochium属的已知幼苗枯萎病病原体进行比较。在15 A（0）C，F. culmorum，M. nivale和M. majus引起燕麦和小麦苗枯病，F. culmorum，平均而言是最积极的比后两个。在5A（0）C时，只有F. culmorum和M.雪腐病引起燕麦和小麦的幼苗枯萎病。在实验条件下，F. langsethiae和F. Poae不能产生幼苗枯萎病，表明这两个物种在发育的幼苗阶段分别对燕麦和小麦栽培品种Gerald和Claire不致病。因此，如果播种受感染的种子后没有随后的腐蹄病和/或穗枯病，它们不太可能影响作物的生长和其他产量组成部分，如分蘖数、每穗籽粒产量以及籽粒重量。
Fusarium and Microdochium species are causal agents of seedling blight of small-grain cereal crops where they may contribute to a significant reduction in crop establishment and final yield. Two experiments were carried out to investigate the potential pathogenicity and aggressiveness of F. langsethiae, a recently identified fungus linked with the contamination of cereals with high levels of the trichothecene mycotoxins, HT-2 and T-2. An artificial seed inoculation method involving conidial suspensions was used and the experiments conducted in a growth cabinet set at either 5 or 15A degrees C with a 12 h photoperiod. Known seedling blight pathogens of the genus Fusarium and Microdochium were used for comparison. At 15A(0)C, F. culmorum, M. nivale and M. majus caused seedling blight of oats and wheat with F. culmorum, on average being the most aggressive than the latter two. At 5A(0)C, only F. culmorum and M. nivale caused seedling blight of oats and wheat. Under the experimental conditions employed, F. langsethiae and F. poae failed to produce seedling blight disease indicating that these two species are not pathogenic to oat and wheat cultivars, Gerald and Claire respectively, at the seedling stage of development. They are therefore unlikely to affect crop establishment and other yield components such as tiller number, grain yield per head as well as grain weight if there is no subsequent foot-rot and/or head blight where infected seeds are sown.