Hexaploid spring wheat (Triticum aestivum) may exhibit significant crown rot disease responses to infection by Fusarium pseudograminearum, with a range of susceptibility levels available in commercial cultivars. Dry conditions during grain-fill may lead to the expression of prematurely senescing culms, which typically fail to set grain. Assessment of hexaploid spring wheat plants exhibiting both non-senescent and prematurely senescent culms was performed using visual discolouration, F. pseudograminearum biomass and vascular colonisation in culm sections sampled at three different heights above the crown and at the peduncle. Samples from six commercial cultivars were collected at milk development in 2014 from Narrabri and Tamworth, New South Wales and Wellcamp, Queensland. Prematurely senescent culms exhibited greater visual discolouration, F. pseudograminearum biomass and vascular colonisation than non-senescent culms in each cultivar. A further comparison of the parameters across four time points from milk development, when senescent culms are first observed, to maturity was conducted for cultivar Sunlin. F. pseudograminearum biomass and vascular colonisation were significantly different between culm conditions prior to maturation, while visual discolouration was not significantly different between culm conditions at any single time point. Colonisation of xylem and phloem tissue was extensive in the basal portions of prematurely senescent culms (36 to 99%) prior to maturation, and suggests significant impacts on water and nutrient movement during crown rot disease. Despite a range of resistance ratings being assessed, cultivars were not reliably separated based upon responses to severe disease pressure, demonstrating the continuing need for improved crown rot resistance in commercial wheat.

六倍体春小麦（Triticum aestivum）对伪镰刀菌的感染可能表现出明显的冠腐病反应，在商业品种中可获得一定的敏感性水平。谷物灌装过程中的干燥条件可能导致过早的茎秆表达，通常无法凝固谷物。使用视觉变色假，镰孢对显示出非衰老和早衰茎的六倍体春小麦植物进行评估在茎冠上方和花梗的三个不同高度处取样的茎节中的生物量和血管定殖。2014年在牛奶开发期间，从新南威尔士州的纳拉布里和塔姆沃思以及昆士兰州的韦尔坎普采集了六个商业品种的样品。在每个品种中，早衰茎秆比非衰老茎杆表现出更大的视觉变色，假单胞菌生物量和血管定植。对于品种Sunlin，从最初观察到衰老的牛奶发育到成熟的四个时间点，对参数进行了进一步比较。假单胞菌在成熟之前的茎秆条件之间，生物量和血管定植显着不同，而在任何单个时间点，茎秆条件之间的视觉变色没有显着差异。木质部和韧皮部组织的定植在成熟前的早衰茎的基部（36％至99％）中是广泛的，并且表明在冠腐病期间对水和养分运动有显着影响。尽管已评估了一系列抗性等级，但仍无法根据对严重病害压力的反应可靠地分离出品种，这表明持续需要改进商品小麦的冠腐病抗性。