토마토 (Lycopersicon esculentum) 표피조직의 이형세포 분화 발달
Development of Epidermal Idioblasts in the Reproductive Structures of Lycopersicon esculentum
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초록
식물체에 여러 유기성분을 함유하는 발향성 식물인 토마토는 표피조직에 여러 형태의 이형세포가 발달한다. 유용식물인 토마토에 대하여는 많은 영역에서 활발하게 집중 연구되고 있으나, 표피조직에 발달하는 이형세포에 촛점을 두고 구조적으로는 자세히 연구되어 있지 않고 있다. 이에 본 연구에서는 토마토 표피조직, 특히 생식기관의 표피조직에 발달하는 이형세포들의 구조 및 분화 발달양상을 주사전자현미경적 방법으로 연구하였다. 토마토 표피조직에는 불규칙형 기공과 방사형 돌출기공의 두 유형의 기공이 발달하였으며, 모용은 분비성과 비분비성의 다양한 4가지 형태로 분화하였다. 분비성 모용은 peltate형과 capitate형 분비모로 대별되었고, 비분비성 모용은 단상모과 원좌형 기저세포의 장상모로 발달하였다. 특히, 화경에는 돌출기공의 발달이 현저하였고, peltate형 분비모는 꽃받침과 자방 표피조직에 뚜렷하였다. 이후 분비모용과 돌출기공에 대한 세포학적 측면에서의 구조적인 연구가 병행되어 본 결과와 접목되면 구조와 기능간의 관계규명에 많은 도움을 줄 것이며, 유용성분의 자원화 및 기능물질 개발에 있어 더욱 의미있는 연구가 될 것이다.
Abstract
Plants of Lycopersicon esculentum, containing various organic compounds, are known to develop idioblasts in their epidermis. Lycopersicon esculentum have long been investigated in many areas, but structural aspects of the epidermis of various organs have not been carried out in detail. Thus, the present study attempted to reveal the patterns of idioblast development, particularly those of the reproductive organs, in L. esculentum epidermis using scanning electron microscopy. The present study mainly focused on patterns of the stomata and trichome types.Two types of stomata were developed in the flowers and fruits: anomocytic stomata (stomata typeⅠ), were distributed normally throughout the epidermis, whereas actinocytic raised stomata (stomata type Ⅱ), were found variously in different epidermal tissues. For the trichomes, both glandular and non-glandular types were developed in the epidermis. The former included peltate glandular trichomes having four head cells (trichome type Ⅰ) and capitate multicellular glandular trichomes (trichome type Ⅱ). The latter included non-glandular short trichomes (trichome type Ⅲ) and considerably elongated trichomes with basal rosette cells (trichome type Ⅳ). In paticular, the raised stomata were well-developed in the peduncles and the peltate glandular trichomes were prominent in the sepal and ovary epidermis. Transmission electron microscopy on the ontogeny and ultrastructural differentiation of these idioblasts, associated with the current result, will aid us in better understanding of the structure and functional relationship in the epidermal differentriation of Lycopersicon esculentum.
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