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91.
Ryuji Ishikawa Yuko Harata Yasunori Tuchimine Mineo Senda Shinji Akada Takeo Harada Minoru Niizeki 《Euphytica》1997,98(3):197-203
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.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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