Krupinsky J M, Berdahl J D
Plant Pathologist.
Research Geneticist, United States Department of Agriculture-Agricultural Research Service, Northern Great Plains Research Laboratory, P.O. Box 459, Mandan, ND 58554-0459.
Plant Dis. 2000 Dec;84(12):1299-1302. doi: 10.1094/PDIS.2000.84.12.1299.
Forage yield and persistence of intermediate wheatgrass and pubescent intermediate wheatgrass can be adversely affected by foot rot caused by Fusarium graminearum, Bipolaris sorokiniana, or both. Putative B. sorokiniana- and F. graminearum-resistant plants were selected from both Reliant and Manska cultivars of intermediate wheatgrass to produce four populations. When plants from half-sib families that were selected for resistance were intercrossed and progeny subjected to subsequent selection cycles for B. sorokiniana and F. graminearum resistance, progressively higher percentages of putative resistant seedlings were found for three of the four selected populations compared to the original base populations. In cycle 3 of three populations, 7 to 91% of half-sib families with statistically higher seedling survival rates than the base populations were considered more resistant than the base populations. Thus, progressive improvement in seedling survival was realized for three populations selected for resistance using three cycles of recurrent phenotypic selection among and within half-sib families.
中间偃麦草和毛中间偃麦草的饲草产量及持久性可能会受到禾谷镰刀菌、索氏离蠕孢菌或两者共同引起的根腐病的不利影响。从中间偃麦草的Reliant和Manska品种中筛选出假定抗索氏离蠕孢菌和禾谷镰刀菌的植株，以培育出四个种群。当选择的具有抗性的半同胞家系植株进行杂交，并对后代进行后续索氏离蠕孢菌和禾谷镰刀菌抗性选择循环时，与原始基础种群相比，四个选择种群中的三个种群中假定抗性幼苗的比例逐渐升高。在三个种群的第3轮选择中，7%至91%的半同胞家系幼苗存活率在统计学上高于基础种群，被认为比基础种群更具抗性。因此，通过在半同胞家系间和家系内进行三轮轮回表型选择，对选择抗性的三个种群实现了幼苗存活率的逐步提高。
