EFFECTS OF INOCULUM DENSITY AND TEMPERATURE ON 3 COMPONENTS OF LEAF RUST RESISTANCE CONTROLLED BY LR34 IN WHEAT
EFFECTS OF INOCULUM DENSITY AND TEMPERATURE ON 3 COMPONENTS OF LEAF RUST RESISTANCE CONTROLLED BY LR34 IN WHEAT
复制标题
DOI：
10.1007/bf00033772
复制
发表时间：
1994-01-01
期刊：
影响因子：
1.9
通讯作者：
DRIJEPONDT, SC
中科院分区：
文献类型：
--
作者：
PRETORIUS, ZA;KLOPPERS, FJ;DRIJEPONDT, SC
不同的接种密度对在温室中保持感染后较低温度（17.5 摄氏度）的成年 RL6058 (Thatcher* 6/PI58548 [Lr34]) 植物的旗叶上测量的潜伏期、尿素密度和尿素大小的影响可以忽略不计。在较高温度（24.6 摄氏度）下对锈病严重程度的定性评估中，所有三个抗性成分均表明 RL6058 上的旗叶反应敏感。在后一种环境中，对不同接种密度的接受性的精确估计表明，成年 RL6058 植物支持的脓疱明显少于易感叶锈病的品种 Thatcher。在分蘖植物中，在所有成对的温度-接种密度组合中，RL6058 和 Thatcher 上产生的尿素数量统计上相等。与生长阶段相关的易感性，以及有利于缩短潜伏期和增大尿素的较高温度，可能导致 Puccinia recondita f 的最终严重程度。 sp。小麦对含有 Lr34 的小麦基因型。然而，与该基因相关的感受性降低可能有助于延迟具有单基因 Lr34 抗性的品种或品系的疾病增加。
Different inoculum densities had negligible effects on latent peri od, uredinium density and uredinium size measured on flag leaves of adult RL6058 (Thatcher* 6/PI58548 [Lr34]) plants kept at low (17.5 degrees C) post-infection temperatures in a glasshouse. In a qualitative assessment of rust severity at higher (24.6 degrees C) temperatures, all three components of resistance indicated a susceptible flag leaf response on RL6058. In the latter environment, precise estimations of receptivity to different inoculum densities showed that adult RL6058 plants supported significantly less pustules than the leaf rust-susceptible cultivar Thatcher. In tillering plants, statistically equal numbers of uredinia developed on RL6058 and Thatcher in all paired temperature-inoculum density combinations. Growth stage-related susceptibility, and higher temperatures conducive to a shorter latent period and larger uredinia, could result in high terminal severities of Puccinia recondita f. sp. tritici on wheat genotypes containing Lr34. The reduction in receptivity associated with this gene may contribute, however, to delayed disease increase on cultivars or lines with monogenic Lr34 resistance.