Price J A, Workneh F, Evett S R, Jones D C, Arthur J, Rush C M
Texas AgriLife Research, Amarillo 79106.
United States Department of Agriculture-Agricultural Research Service Conservation & Production Research Laboratory, Bushland, TX 79012.
Plant Dis. 2010 Jun;94(6):766-770. doi: 10.1094/PDIS-94-6-0766.
Greenhouse and field studies were conducted to determine the effects of Wheat streak mosaic virus (WSMV), a member of the family Potyviridae, on root development and water-use efficiency (WUE) of two hard red winter wheat (Triticum aestivum) cultivars, one susceptible and one resistant to WSMV. In the greenhouse studies, wheat cultivars were grown under three water regimes of 30, 60, and 80% soil saturation capacity. After inoculation with WSMV, plants were grown for approximately 4 weeks and then harvested. Root and shoot weights were measured to determine the effect of the disease on biomass. In all water treatments, root biomass and WUE of inoculated susceptible plants were significantly less (P < 0.05) than those of the noninoculated control plants. However, in the resistant cultivar, significance was only found in the 30 and 60% treatments for root weight and WUE, respectively. Field studies were also conducted under three water regimes based on reference evapotranspiration rates. Significant reductions in forage, grain yield, and crop WUE were observed in the inoculated susceptible plots compared with the noninoculated plots. Both studies demonstrated that wheat streak mosaic reduces WUE, which is a major concern in the Texas Panhandle because of limited availability of water.
开展了温室和田间研究，以确定马铃薯Y病毒科成员小麦线条花叶病毒（WSMV）对两个硬红冬小麦（普通小麦）品种根系发育和水分利用效率（WUE）的影响，其中一个品种对WSMV敏感，另一个品种对WSMV具有抗性。在温室研究中，小麦品种在土壤饱和持水量分别为30%、60%和80%的三种水分条件下种植。接种WSMV后，让植株生长约4周，然后收获。测量根和地上部重量，以确定病害对生物量的影响。在所有水分处理中，接种的感病植株的根生物量和水分利用效率均显著低于（P < 0.05）未接种的对照植株。然而，在抗性品种中，仅在土壤饱和持水量为30%和60%的处理中，根重和水分利用效率分别出现显著差异。田间研究也基于参考蒸发散速率在三种水分条件下进行。与未接种地块相比，接种的感病地块的饲草、籽粒产量和作物水分利用效率均显著降低。两项研究均表明，小麦线条花叶病会降低水分利用效率，由于水资源有限，这是德克萨斯狭长地带的一个主要问题。
