Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Tissue Specific Expression of Wound-Inducible RCaM-2 Promoter in Transgenic Tobacco Plants

상처에 의해서 유도되는 벼 calmodulin promoter의 transgenic 담배에서조직 특이적 발현

  • Published : 2005.04.01
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Abstract

To study calmodulin (CaM) gene expression and its regulation, rice CaM promoter (RCaM-2) was isolated and fused to $\beta-glucuronidase$ (GUS), reporter gene. X-Glue staining patterns revealed that GUS localization is high in meristemic tissues such as the stem apex, stolen tip, and vascular regions. GUS staining in the transverse sections of stem and petiole was restricted to the inside of the vascular system, and cortex and epidermis located outside of the vascular system usually did not show GUS staining even a plant that expressed strong activity. GUS activity was found to be tissue specific expressed and exhibited a dramatic transient increase in response to wounding. These results suggest that the 5'-flanking region of RCaM gene regulates wound-inducible expression.

Calmodulin 유전자의 발현 조절을 연구하기 위해, 벼 calmodulin promoter (RCaM-2)를 분리하여 GUS (report 유전자)에 융합하였다. GUS 활성은 정단조직, 근단 및 관다발 영역과 같은 성장조직에서 높게 발현되었다. 줄기와 페티올의 transverse 절단부위 GUS 활성은 관다발계의 안쪽에 제한되었으며 관다발계의 외부에 위치한 피층과 표피에서는 강하게 발현된 식물에서도 GUS 활성이 나타나지 않았다. GUS 활성은 어린 조직에서 특이적으로 발현되었으며 상처에 의해서 신속하게 증가하였다. RCaM-2 promoter는 세포분열이 왕성한 어린조직이나 생장점에서 강하게 발현되며 mechanical 신호에 의해서 현저히 유도되었다. 이러한 결과는 RCaM-2 유전자의 5'-flanking 영역이 상처에 의해서 유도되는 발현을 조절하는 것으로 추정된다.

Keywords

References

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