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        In vitro culture of hybrid ovule between Fagopyrum esculentum Moench and F. homotropicum Ohnishi

        Sun Hee Woo(禹仙熙),Taiji Adachi(足立泰二),Seung Keun Jong(鄭丞根) 한국육종학회 1997 한국육종학회지 Vol.29 No.3

        Interspecific hybridization in buckwheat is of great importance to transfer desirable genes from wild species to cultivars as well as to broaden genetic variation in cultivars. In vitro ovule culture following the bud pollination was made to overcome postzygotic cross/self-incompatibility in interspecific hybridization between Fagopyrum esculentum Moench (common heterostylous buckwheat) and F. homotropicum Ohnishi (homostylous buckwheat). The percentage of fertilized ovaries of F. esculentum flowers (thrum-type) pollinated with F. homotropicum was 50%, while that of the reciprocal cross was as low as 10% and their ovaries were smaller. Vigorous pollen tube elongation following the bud pollination indicated the possibility for overcoming of breeding barriers in interspecific crosses between buckwheat species. Pre-embryo formation was observed 48 hours after pollination and ovules cultured up to 5 days after pollination tended to develop callus. But ovules isolated 11 days after pollination had apparently lost their viability. Hybrid plantlets were produced from only the ovules dissected 5 days after bud pollination. Regeneration rate was better in ovule culture on White medium than other mediums tested. Interspecific hybrid plants between F. esculentum and F. homotropicum were regenerated with the rate of 24.2% in average.

      • Plant Regeneration from Hypocotyls of common buckwheat, (Fagopyrum esculentum Moench) and annual wild buckwheat, (F. homotropicum Ohnishi)

        禹仙熙,足立泰二,鄭丞根 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-

        Plant regeneration from cultured hypocotyls may provide means for overcoming breeding barriers caused by heterostylic cross-incompatibility in interspecific crosses of common buckwheat(Fagopyrum esculentum Moench). Hypocotyles were excised from seed embryos of common buckwheat(cv. Miyazakizairai) and wild annual buckwheat(F. homotropicum Ohnishi) and cultured on MS medium supplemented with 0∼2.0 mg/l IAA and 0~2.0 mg/l BAP. Shoot was induced only on the medium containing 1.0 mg/l NAA and 1.0 mg/l BAP, shoot induction was promoted by 2.4-D and the frequency was lower in wild annual buckwheat than in common buckwheat. Roots were developed on White's medium containing 1.0 mg/l IBA. Whole plantlets were obtained following the production of adventitious roots from the shoots. When transferred from sterile culture condition to peat and soil medium, most plantlets were able to survive and grew to have flowers. Key words : Common buckwheat(Fagopyrum esculentum), F. homotropicum Ohnishi, hypocotyle explants, tissue culture, plant regeneration

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