摘要
在水稻发芽期，筛选耐盐性品种的最适ＮａＣ１浓度是１．５％。在这个浓度 下，调查了九个亚洲国家的３０６个品种的耐盐性。参照程氏形态分类法的稃毛标准 将参试品种分成籼和粳，籼稻品种比粳稻更耐盐。酯酶（ Ｅｓｔ）同工酶分析也印证 了这一结果。酯酶同工酶的等位基因 Ｅｓｔ－２２、Ｅｓｔ．３２和 Ｅｓｔ．４１可以用来鉴别籼稻品 种，而Ｅｓｔ．２°、Ｅｓｔ－３１和Ｅｓｔ－４°可以识别粳稻品种。具有等位基因Ｅｓｔ－２２、Ｅｓｔ－３３和 Ｅｓｔ－４１的品种比具有Ｅｓｔ－２°、Ｅｓｔ－３１和Ｅｓｔ－４°的品种更耐盐。比较七个酯酶同工酶 酶谱的品种耐盐性，发现有７０％的具有Ｅｓｔ－２２的品种在１．５％ＮａＣ１浓度下发芽率 超过５０％。因此，等位基因Ｎ Ｅｓｔ－２２可能是品种耐盐性的一个标志。大多数马来西 亚的品种是耐盐的，其次为缅甸、中国和孟加拉的品种。大多数泰国、菲律宾和日 本的品种对盐敏感。
It was concluded that the optimum NaC1 concentration was 1. 5% for screening salt-tolerant varieties in the germination stage. At this concentration, the germination rates of 275 varieties from nine Asian countries were investigated. Among the six morphological characters used by Cheng (1988), glume hairinss was the most reliable in Indi ca-Japonica classification. Indica varieties were more salt-tolerant than Japonica ones. This result corresponded to esterase isozyme analysis. Alleles Est-22, Est-32 and Est-41 were used in identifying Indica varieties. Alleles Est-20, Est-31 and Est-40 served as identifying Japonica varieties. Varieties carrying alleles Est-22, Est-32and Est-41 were more salt-tolerant than those carrying Est-20, Est-31 and Est-40. According to salt-tolerant comparison among the seven esterase genotypes, the three alleles of locus Est-2 showed quite different associations with respect to the degree of salt tolerance. Seventy percent of the varieties with alleles Est-22 had more than 50% of germination rate at 1. 5 % NaC1. Allele Est-22 seemed to be a marker of rice salt tolerance. Most of the varieties from Malaysia were salt-tolerant, followed by varieties from Thailand, the Philippines and Japan were salt-susceptible.
出处
《西南农业学报》
CSCD
北大核心
2000年第3期6-11,共6页
Southwest China Journal of Agricultural Sciences
