고추의 소포자 배양 시 배지 첨가와 진탕이 배의 생산에 미치는 영향
Influence of medium addition and agitation on the production of embryos in isolated microspore culture of hot pepper (Capsicum annuum L.)
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초록
본 연구에서는 고추의 나출 소포자 배양 시 배양 중 새배지의 첨가와 진탕이 배의 생산에 미치는 영향을 조사하였다. 액체-2층 배양에서 초기 액체배양 시에 새 배지를 첨가하면 배의 발생과 발달 모두 크게 증가하였다. 가장 효과적인 첨가 시기는 초기액체 배양을 시작한 5일후 이었다. 한편 액체-2층 배양에서 후기 2층배양 시의새 배지 첨가는 초기 액체배양 시 첨가 때에 비해 그 효과가 적었다. 액체-2층 배양에서 후기 2층배양 시의 1주간 진탕은 정상 자엽배 생산에 효과적이었다. 액체배양시에도 배양 1주 후의 1주간 진탕은 배의 발달에 효과적이었다. 그러나 액체-2층배양 시와 액체배양 시 모두 진탕기간이 2 ~ 3 주간으로 길어질 때에는 배의 발달이 비정상적이었다. 본 실험 결과 얻어진 정상 자엽배들은 재분화 배지에 이식 시 용이하게 유식물체로 발달하였다. 재분화 식물체들 중에는 반수체와 배가반수체가 혼재하였으며, 이들 간에는 공변세포 내 엽록체 수의 차이가 뚜렷하였다. 이와 같은 결과들은 고추에서 다수의 정상자엽배를 생산할 수 있는 소포자 배양 시스템을 확립하는데 중요한 기초자료가 될 것이다.
Abstract
The influences of the agitation as well as the addition of medium during culture on the production of embryos were invested in isolated microspore culture of hot pepper (Capsicum annuum L.). When the culture medium was added during initial liquid culture step of liquid-double layer culture, the embryo yield and quality greatly increased. The most effective time point for medium addition was 5 days after the culture commenced. On the other hand, the effect of medium addition at later double layer culture step in liquid-double layer culture on the embryo production was less compared to that of medium addition during the initial liquid culture step. Agitating the culture for 1 week during later double layer culture step in liquid-double layer culture effectively increased the production of normal cotyledonary embryos. In the case of liquid culture, agitating the culture for 1 week from 7 days after the culture commenced was also effective for embryo development. However, when the total agitation time was longer (2 to 3 weeks) during liquid-double layer culture or liquid culture, the embryos developed abnormally in both cases. The normal cotyledonary embryos obtained in this study successfully developed to plants when transferred to regeneration media. These regenerated plants were either diploid or haploid, and there was a difference in the number of chloroplasts between guard cells of diploid and haploid. These results can be used as an important data for developing an efficient microspore culture system with high quality embryo production in hot pepper.
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