무스카리 ‘Early Giant’ 잎 절편 유래 캘루스 배양을 통한 고빈도 체세포배 발생
High frequency somatic embryogenesis through leaf explant-derived callus culture in Muscari armeniacum cv. ‘Early Giant’
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Using calli of Muscari armeniacum cv. ‘Early Giant’ that is monocotyledonous ornamental bulb crop with increasing demand in Korea, we carried out current studies to establish an in vitro multiple propagation protocol via somatic embryogenesis. We found that soft pale yellow green calli were induced from leaf explants cultured on all media containing 0.1~3.0 mg･L-1 auxins such as 1-naphthalene acetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). However, induced calli showed vigorous growth only when they further transferred on same media containing 2,4-D, 4-amino-3,5,6-tri-chloropicolinic acid (picloram), or 3,6-dichloro-o-anisic acid (dicamba). Although frequency of somatic embryo induction depended on callus source and PGR composition in somatic embryo induction media,somatic embryogenesis was initiated on surface of proliferated calli after transferring on media with no PGR or 0.01 mg･L-1 NAA co-supplemented with various cytokinins such as N6-benzylaminopurine (BAP). Highest number of embryo at 9.3 per callus clump was obtained when calli which were grown under 0.1 mg･L-1 picloram supplementation were sub-cultured on medium with 0.01 mg･L-1 NAA and 0.5 mg･L-1 BAP. In addition, morphological characteristics of somatic embryo were categorized into following nine phases: globular, biased heart, biased torpedo, early cotyledonary, middle cotyledonary, late cotyledonary, early sprouting, middle sprouting, and late sprouting embryos.
Abstract
Using calli of Muscari armeniacum cv. ‘Early Giant’ that is monocotyledonous ornamental bulb crop with increasing demand in Korea, we carried out current studies to establish an in vitro multiple propagation protocol via somatic embryogenesis. We found that soft pale yellow green calli were induced from leaf explants cultured on all media containing 0.1~3.0 mg･L-1 auxins such as 1-naphthalene acetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). However, induced calli showed vigorous growth only when they further transferred on same media containing 2,4-D, 4-amino-3,5,6-tri-chloropicolinic acid (picloram), or 3,6-dichloro-o-anisic acid (dicamba). Although frequency of somatic embryo induction depended on callus source and PGR composition in somatic embryo induction media,somatic embryogenesis was initiated on surface of proliferated calli after transferring on media with no PGR or 0.01 mg･L-1 NAA co-supplemented with various cytokinins such as N6-benzylaminopurine (BAP). Highest number of embryo at 9.3 per callus clump was obtained when calli which were grown under 0.1 mg･L-1 picloram supplementation were sub-cultured on medium with 0.01 mg･L-1 NAA and 0.5 mg･L-1 BAP. In addition, morphological characteristics of somatic embryo were categorized into following nine phases: globular, biased heart, biased torpedo, early cotyledonary, middle cotyledonary, late cotyledonary, early sprouting, middle sprouting, and late sprouting embryos.
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