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Origin of Cultivated Rice
Analysis of genes controlling f(1) sterility in rice by the use of isogenic lines.
  • H. Oka
  • Biology, Medicine
  • Genetics
  • 1 July 1974
TLDR
Crossing experiments with the isogenic lines confirmed the author's previous hypothesis that there are sets of duplicate gametic lethals (s genes) and that gametes carrying a double recessive combination (s(1)s(2)) of these deteriorate during development, though in the present hypothesis the genes are considered to affect the development of microspores only. Expand
Differentiation of perennial and annual types due to habitat conditions in the wild riceOryza perennis
TLDR
Populations of the common wild rice of Asia showed a perennial-annual continuum and differed in reproductive allocation and many other traits, suggesting their niche differentiation within a gene pool. Expand
GENETIC STUDIES OF SPECIATION IN CULTIVATED RICE
TLDR
The standard deviation of x values for different characters was used as an index showing recombination of parental characteristics or “character discordance”, which suggested that parental genes could be recombined almost freely. Expand
Phylogenetic Differentiation of Cultivated Rice. XV:Complementary Lethal Genes in Rice
TLDR
Having observed a number of crosses between rice varieties, two types or hybrid inviability were found, which are reported in this paper, and the former may bring about a tendency to hybrid-breakdown, and may have played a role in the phylogenetic differentiation of rice varieties. Expand
Phylogenetic Differentiation of Cultivated Rice. XV
TLDR
It was shown that this hybrid inviability was due to a set of “complementary dominant lethals”, and it was discussed that this type of duplicate genes may be widely spread among rice varieties, and may work as an isolating barrier between distantly related varieties. Expand
VARIATIONS IN THE BREEDING SYSTEMS OF A WILD RICE, ORYZA PERENNIS
  • H. Oka, H. Morishima
  • Biology, Medicine
  • Evolution; international journal of organic…
  • 1 June 1967
TLDR
To investigate how the variation in the breeding system of 0. Expand
Experimental studies on the origin of cultivated rice.
  • H. Oka
  • Biology, Medicine
  • Genetics
  • 1 September 1974
TLDR
It was noticed that cultivation by man in itself works as a selective agent for cultivated types and the monophyletic origin of the Indica and Japonica types of O. sativa was discussed. Expand
COMPARISON OF MODES OF EVOLUTION OF CULTIVATED FORMS FROM TWO WILD RICE SPECIES, ORYZA BREVILIGULATA AND O. PERENNIS
TLDR
This paper deals mainly with the comparison of the two series regarding the mode of evolution of cultivated forms regarding the phylogenetic relationships in Series Sativa. Expand
INTROGRESSION ACROSS ISOLATING BARRIERS IN WILD AND CULTIVATED ORYZA SPECIES
  • Y. Chu, H. Oka
  • Biology, Medicine
  • Evolution; international journal of organic…
  • 1 June 1970
Cultivated rice species and their wild relatives are differentiated into several groups mutually isolated by various types of reproductive barriers (Chu et al., 1969a). Their natural hybrids occurExpand
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