Genealogy of the "Green Revolution" gene in rice

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概要

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• During the “Green Revolution” of rice, high-yielding varieties (HYVs) were developed using a semi-dwarf gene (sd1 or OsGA20ox2). The presence or absence of the two mutant alleles (DGWG type in Dee-geo-woo-gen and JKK type in Jikkoku) were surveyed by PCR using 256 accessions of eight wild and two cultivate rice species. The DGWG allele was detected in a landrace (Oryza sativa) and two accessions of wild rice (O. rufipogon), all of which are from China, showing their limited distribution. Genealogical studies of the OsGA20ox2 gene showed that the 62 sequences of O. sativa and O. rufipogon included 20 distinct haplotypes, indicating that the species complex contained OsGA20ox2 genes from two different lineages. The silent site nucleotide diversities (π and θw) were extremely low in Japonica rice, suggesting a genetic bottleneck. The haplotype network showed that the DGWG and JKK alleles were derived in different lineages. The DGWG carrier (W1944) had unique polymorphisms in the surrounding region of the locus, suggesting that the DGWG allele has been preserved in the wild progenitor, rather than that the DGWG allele has been introgressed from HYVs to W1944. Although a semi-dwarfing plant is a weak competitor under saturated fields, the crossing experiment revealed that the DGWG variant might have been preserved as a hidden variation in the genetic background of wild rice, without expressing a short-stature.

• 日本遺伝学会の論文
• 2005-10-25

著者

• Sano Yoshio

  Graduate School Of Agriculture Hokkaido Univ.

• Onishi Kazumitsu

  Plant Breeding Lab., Graduate School of Agriculture, Hokkaido University

• NAGANO Hironori

  Department of Applied Biotechnology, University of Hokkaido

• ONISHI Kazumitsu

  Department of Applied Biotechnology, University of Hokkaido

• OGASAWARA Mitsuhiro

  Department of Applied Biotechnology, University of Hokkaido

• HORIUCHI Yuki

  Department of Applied Biotechnology, University of Hokkaido

• SANO Yoshio

  Department of Applied Biotechnology, University of Hokkaido

• Nagano Hironori

  Department Of Applied Biotechnology University Of Hokkaido

• Horiuchi Yuki

  Plant Breeding Lab. Graduate School Of Agriculture Hokkaido University

• Onishi Kazumitsu

  Plant Breeding Lab. Graduate School Of Agriculture Hokkaido University

• Ogasawara Mitsuhiro

  Department Of Applied Biotechnology University Of Hokkaido

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• A QTL Cluster for Plant Architecture and Its Ecological Significance in Asian Wild Rice
• Genealogy of the "Green Revolution" gene in rice
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