48个苜蓿品种对3种病害抗性的初步评价

Preliminary evaluation of 48 alfalfa varieties for resistance to three diseases

在兰州大学榆中校区品种比较试验田,以发病率为指标,采用国际上通用的苜蓿病害抗病性评价的分级标准,比较了国内外48个苜蓿品种对褐斑病、霜霉病和锐顶镰刀菌根腐病的抗病性,并对其进行了综合评价。抗病性等级评价结果表明,不同苜蓿品种对褐斑病的抗性表现是UC-1465为高抗(HR)品种,UC-1887为抗病(R)品种,Siriver与Trifecta为中抗(MR)品种,Avrora、HunterRiver、SaranacAR为低抗(LR)品种,其余41个品种均为感病(S)品种;对霜霉病的抗性表现是48个苜蓿品种均为高抗(HR)品种;对锐顶镰刀菌根腐病的抗性表现是48个苜蓿品种均为高抗(HR)品种。综合评价结果表明,Vertus、中兰1号和新牧1号对褐斑病、霜霉病和锐顶镰刀菌根腐病均具有较强的抗病性,为高抗品种;UC-1887、UC-1465和SaranacAR对褐斑病、霜霉病和锐顶镰刀菌根腐病的抗病性均较差,为感病品种。

The aim of this field study was to compare the resistance of 48 alfalfa(Medicago sativa)varieties from China and abroad to three different diseases:common leaf spot(Pseudopeziza medicaginis),downy mildew(Peronospora aestivalis),and root rot(Fusarium acuminatum).The study was conducted at Yuzhong Campus,Lanzhou University.The disease incidence rate was used as an indicator of susceptibility,and the internationally accepted alfalfa disease resistance evaluation grading standard was applied to compare resistance among the 48 alfalfa varieties.The results of our analyses showed that,in terms of resistance to common leaf spot disease,UC-1465 was a highly resistant variety,UC-1887 was a resistant variety,Siriver and Trifecta were medium-resistance varieties,Avora,Hunter River and Saranac AR were low-resistance varieties,and the remaining 41 varieties were susceptible varieties.In terms of resistance to downy mildew and root rot,all 48 alfalfa varieties were highly resistant varieties.The results of subordinate function analysis showed that Vertus,Zhonglan No.1 and Xinmu No.1 were strongly resistant to common leaf spot,downy mildew,and root rot,indicating that they are highly resistant varieties;while UC-1887,UC-1465 and Saranac AR had lower resistance to the three diseases,indicating that they are susceptible varieties.