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지황 잎조직 절편으로부터 신초 형성

Efficient Procedures for Direct Shoots Regeneration from Leaf Explants ofRehmania glutinosa Lib.

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초록

지황 (R. glutinosa)의 조직절편으로부터 고효율의 식물체 재분화 시스템을 확립하기 위하여 기내에서 발아된 유묘의 잎을 절취하여 auxins과 cytokinins을 농도별로 단독 또는 혼합하여 MS배지에 치상한 후 신초의 형성율을 조사하였다. 잎 절편으로부터 부정아의 형성율은 1㎎/ℓ BA와 2㎎/ℓ IAA가 첨가된 MS배지에서 93.4%로 가장 높았다. 한편, 엽령에 따른 부정아의 형성율을 조사한 결과 기내에서 발아 후 6주가 지난 유식물체의 정단부위로부터 3번째의 잎을 사용함으로써 신초의 형성율을 98.4%까지 높일 수 있었다. 형성된 신초는 0.1㎎/ℓ IBA가 첨가된 1/2MS배지로 옮겼을 때 4주 후 최대 발근율을 보여주었다.

Abstract

Adventitious shoots were directly induced from leaf explants of R. glutinosa, an important medicinal plant.Proliferating shoot cultures were obtained by culturing leaf discs on Murashige and Skoog(MS) medium alone or combina-tion with auxins and cytokinins. MS medium supplemented with 1. /. BA and 2 . /. IAA was the most efective, provid-ing high shoot bud formation frequency without formation of intervening callus. The efect of leaf age on adventitious shootformation was also investigated. The maximum shoot bud production.(93.4%) was achived using 3rd leaf from apex of 6weeks old plantlets after seed germination. Plantlet were rooted on an half-strength MS.(1/2MS) medium containing0.1. /. IBA. This prtocol is useful for clonal propagation and Agrobacterium-mediated transforamtion in R. glutinosa.

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