Number of Embryos and Emergence of Hybrid Seedlings in Polyembryonic Citrus

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  • 多胚性カンキツの胚数およびその雑種実生出現
  • タハイセイ カンキツ ノ ハイスウ オヨビ ソノ ザッシュ ミショウ シュツゲン

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The number of embryos per seed was counted in 13 local citrus accessions distributed in Kagoshima, Japan. Kawabata Mikan and Usukawa (Kishu Mikan) showed monoembryony and the remaining 11 accessions showed polyembryony. Among the polyembyronic accessions, Hetsuka Daidai and Kimikan showed the lowest (1.4) and highest (41.4) number of embryos per seed, respectively. Next, the relationship between the number of embryos per seed and percentage of hybrid seedlings that emerged was investigated. Six polyembryonic accessions and monoembryonic Sakurajima Komikan were used as the seed parents. Their number of embryos per seed ranged from one to 35.‘ Mato Anyu’ was used as the pollen parent in all cross combinations. The percentage of emerged hybrid seedlings became low when the number of embryos per seed in the seed parent increased. When the number of embryos per seed of a seed parent was around eight, approximately 20% of seedlings were hybrids. However, when the number of embryos was 25 or more, hybrids hardly appeared.

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