アジア稲におけるDNA量の変異〔英文〕

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概要

• 論文の詳細を見る

• We examined the variation of DNA content in Asian rice; wild species, Oryza perennis, cultivated species, O. sativa, and the wild-cultivated intermediate Jeypore strains. DNA contents were estimated Feulgen microspectro-photometrically and chemically. In addition, nuclear volume was recorded which was known to correlate positively with DNA content. There existed strong correlations between the estimates obtained by the above three methods, showing a reliability of the present measurements.In each species, considerably wide variation of DNA content was detected which was not due to random error of the measurements. Though variations among strains overlapped between O. perennis, Jeypore strains and O. sativa, they showed an evolutionary tendency. Oryza perennis strains generally had the higher DNA contents than O. sativa strains and the intermediate Jeypore strains had the intermediate values. Therefore, we consider that DNA content of Asian rice has decreased during evolution (domestication). In Asian rice, reduction of DNA content is parallel to the reduction of the globular period of embryo which means the decrease of developmental instability. The reductional nature of DNA content during evolution is also observed in the process of speciation of other species and as well in the evolution of monocotyledons at the order level. This suggests that many evolutionary changes in plants, if not all, are connected with the decrease of DNA content.

• 日本遺伝学会の論文

著者

• 長戸 康郎

  Experimental Farm Faculty of Agriculture, University of Tokyo

• 山元 皓二

  Laboratory of Plant Breeding, Faculty of Agriculture, University of Tokyo

• 山下 秀樹

  Ministry of the Agriculture, Forestry and Fishery

• NAGATO Yasuo

  Experimental Farm Faculty of Agriculture, University of Tokyo

• YAMAMOTO Koji

  Laboratory of Plant Breeding, Faculty of Agriculture, University of Tokyo

• YAMASHITA Hideki

  Ministry of the Agriculture, Forestry and Fishery

関連論文

• アジア稲におけるDNA量の変異〔英文〕
• The Effect of Ageing on Bud Differentiation in the Moss, Physcomitrium sphaericum
• Radiation-induced Chromosomal Aberration in Relation to DNA Synthesis
• Relationship between the Growth Rate of a Filament and the Ability to Differentiate a Bud in the Moss, Physcomitrium sphaericum
• The Position of Bud Differentiation on Protonema of the Moss, Physcomitrium sphaericum

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