caa a22 4500 477133649 CHVBK 20180405111711.0 cr unu---uuuuu 170330e19971201xx s 000 0 eng 10.1023/A:1003142817509 doi (NATIONALLICENCE)springer-10.1023/A:1003142817509 Complex constitutive nature of Japanese upland rice, Oryza sativa L [Elektronische Daten] [Ryuji Ishikawa, Yuko Harata, Yasunori Tuchimine, Mineo Senda, Shinji Akada, Takeo Harada, Minoru Niizeki] Two rice ecotypes, the so-called lowland and upland populations, which carry different isozyme genotypes mostly at a single locus, are cultivated in Japan. The aim of this study was to examine the origin and the mechanism for keeping these genetic differences. The upland population is cultivated in upland fields and carries a different allele for a particular isozyme gene, Pgd-1, which has never been found in the lowland population. RFLP markers showed a weak trend for genetic differentiation between the two ecotypes. On the other hand, morphological, and physiological traits showed marked differences between the two ecotypes. Furthermore, based on the genotypic difference, two Japonica subgroups are defined in the upland population. Subgroup I is the minor group and carries key lowland characters, including the genotype for PGD. Subgroup II carries different traits and the genotype for PGD of the alternative subgroup. As an allelic difference for Pgd-1 is known to occur between the two ecospecies, Tropical (Tr) and Temperate (Tm) Japonicas, upland cultivars can be classified by diagnostic characters which distinguish a variety into Tr or Tm type. The upland population consists of three types of cultivars, Tr-, Tm- and intermediate-type. In contrast, the lowland population consists of a uniform Tm type Japonicas. As Japanese upland cultivars still have an isozyme allele specific to the Tr type, the upland population has a rather complex constitution which is presumably now being introgressed by lowland genetic material, but still represents a major difference at some genetic levels. Upland rice carries several stress-resistant genes which would be useful for lowland rice breeding. The genetic difference would be efficient for tagging upland specific traits by upland specific genetic markers. Kluwer Academic Publishers, 1997 isozyme nationallicence differentiation nationallicence Oryza sativa nationallicence rice nationallicence upland rice nationallicence Ishikawa Ryuji Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut Harata Yuko Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut Tuchimine Yasunori Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut Senda Mineo Gene Research Center, Hirosaki University, 036, Hirosaki, Japan aut Akada Shinji Gene Research Center, Hirosaki University, 036, Hirosaki, Japan aut Harada Takeo Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut Niizeki Minoru Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut Euphytica Kluwer Academic Publishers 98/3(1997-12-01), 197-203 0014-2336 98:3<197 1997 98 10681 https://doi.org/10.1023/A:1003142817509 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003142817509 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ishikawa Ryuji Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 700 1- Harata Yuko Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 700 1- Tuchimine Yasunori Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 700 1- Senda Mineo Gene Research Center, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 700 1- Akada Shinji Gene Research Center, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 700 1- Harada Takeo Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 700 1- Niizeki Minoru Laboratory of Plant Breeding, Faculty of Agriculture, Hirosaki University, 036, Hirosaki, Japan aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 98/3(1997-12-01), 197-203 0014-2336 98:3<197 1997 98 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer