水稻穗部农艺性状与稻曲病抗性的相关性分析

 人工接种试验和田间多年自然发病调查发现,目前生产上应用的水稻品种均感稻曲病;但在自然条件下,不同水稻品种稻曲病的发生程度存在较大差异,可以人为的分为多病粒高感品种和寡病粒相对抗病的品种。为了探究水稻穗部性状与其病害抗性间的关系,本文对孕穗期不同阶段的不同水稻品种的穗部性状进行了比较分析。结果发现表型为多病粒的高感多病粒品种与表型为寡病粒的相对抗病的品种之间在穗子大小、小花密度、穗鞘闭合程度和密封性、旗叶面积等方面均存在明显差异,寡病粒相对抗病的水稻品种穗鞘闭合程度优于高感多病粒品种。

Analysis on relationship between rice agronomic features around the panicles and false smut resistance

Based on the artificial inoculation tests and the investigations in natural conditions for many years, it is found that the most rice varieties used in China were susceptible to rice false smut pathogen, Villosiclava virens. However, the disease severity in different rice varieties is quite different in paddy fields in natural conditions. Based on the number of rice false smut balls in a panicle, rice varieties can be divided artificially into the high susceptible with multiple smut balls and the relatively resistant varieties with few smut balls. To evaluate the relationship between the features in rice panicles at rice booting stage and the disease resistance, the panicle features in various rice varieties were measured and compared here. The results showed that there were significant differences in panicle size, floret density, panicle sheath closure and sealing, flag leaf area between high susceptible varieties with multiple balls and those with relatively resistant phenotype with few balls.The closure of panicle sheath in the resistant varieties was better than that in the susceptible ones.