摘要
埃里砖格孢(Embellisia astragali)引致的沙打旺(Astragalus adsurgens)黄矮根腐病是沙打旺草地早衰的主要原因。在室内无菌条件下将沙打旺黄矮根腐病菌接种于10份沙打旺材料上,测定发芽率、发芽势、幼苗苗长、根长、苗干质量、菌丝扩展长度及菌丝侵入深度。结果表明,该病原菌显著提高了10个材料的种子发芽势(P<0.05),未显著降低参试材料的发芽率(P>0.05);显著增加了供试材料幼苗的根长,但显著降低了所有材料的苗干质量及6份材料的苗长。菌丝侵入程度也存在显著差异,内蒙早熟和宁夏彭阳幼苗的侵染率在不同侵入水平下均显著高于陕西榆林和中沙一号的侵染率。根据病情严重度,各材料的抗病性评价结果为陕西榆林和中沙一号抗病性较强,内蒙早熟和宁夏彭阳抗病性较弱,其余材料介于中间。
Yellow stunt and root rot of standing milkvetch （Astragalus adsurgens） caused by Embellisia astragali is the main factor reducing the perennial foragers biomass. In this study, the resistance to patho- genic fungus of 10 germplasms of A. adsurgens was evaluated by measuring the seed germination rate, shoot and root length, plant dry weight, mycelium distribution, and mycelium invasion extent, incidence, mortality and disease severity index under very sterile conditions. This study showed that the inoculated treatments significantly increased the germination energy and root length of 10 germplasms （P〈0. 05）; did not affect germination rate; and significantly reduced the dry biomass and seedling length of 10 germ- plasms. The mycelium distribution and mycelium invasion extent showed a difference among varieties, in- dicating that the infection rate of Neimeng and Ningxia germplasms was higher than that of Shaxiyulin and Zhongsha No. 1 germplasms. Based on disease incidence, mortality and disease severity index, the compre- hensive evaluation on disease showed that the Shaxiyulin and Zhongsha No. 1 germplasms performed well at seedling stage, that Neimeng and Ningxia germplasms followed, and other germplasms were in between.
出处
《草业科学》
CAS
CSCD
北大核心
2011年第7期1301-1306,共6页
Pratacultural Science
基金
国家重点基础研究发展计划(973项目)课题(2007CB108902)
关键词
根部入侵真菌
抗病性评价
病原菌侵入水平
root-invading fungus
disease resistance assessment
mycelium invasion extent
