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选取来源于中国11个省份和其他9个国家的347份粳稻选育品种作为试验材料,分析了自然低温和冷水胁迫下,不同来源粳稻选育品种孕穗期的耐冷性及主要农艺性状的表型差异和聚类特点。研究表明,在自然低温和冷水胁迫下各省份或国家粳稻选育品种主要农艺性状及其冷水反应指数有明显的差异。在自然低温和冷水胁迫下,云南和日本品种的孕穗期结实率及其冷水反应指数均较高,表现出较强的孕穗期耐冷性。从总体趋势上看,在自然低温下,除个别省份外,我国纬度相对较高的北方省份品种的孕穗期耐冷性强于纬度相对较低的南方省份品种;而在冷水胁迫下,品种的耐冷性与其来源地的关系并不密切,没有呈现出一定的规律性。此外,聚类结果表明,不同省份或国家粳稻选育品种的聚类结果与其品种的地理来源均有一定的相关性,而与自然条件相比,冷水胁迫下粳稻选育品种的聚类结果与其品种的地理来源的相关性更为密切。
A total of 347 japonica rice varieties from 11 provinces in China and 9 other countries were selected as test materials to analyze the phenotypic changes of cold tolerance and major agronomic traits of bred varieties from different sources at natural low temperature and cold water stress Differences and clustering characteristics. The results showed that the major agronomic traits and their cold water response index of the varieties of japonica rice in different provinces or countries under natural low temperature and cold water stress were significantly different. Under natural low temperature and cold water stress, the seed setting rate and cold water response index of Yunnan and Japan cultivars were higher, which showed a stronger cold tolerance at booting stage. From the overall trend, in the natural low temperature, with the exception of some provinces, the cold tolerance of the northern provinces at relatively high latitudes in China was stronger than that in the southern provinces at relatively low latitudes. However, under cold water stress, The relationship between sex and its place of origin is not close, not showing a certain regularity. In addition, the clustering results showed that the clustering results of japonica rice varieties from different provinces or countries had some correlation with the geographical origin of their cultivars. Compared with the natural conditions, the clustering results of japonica rice varieties under cold water stress were different from The geographical origin of varieties is more closely related.