벼속(Oryza) 잎의 식물규소체 표징형질

Some opal phytoliths diagnostic characters of Oryza leaves

  • 황성수 (전북대학교 사범대학 과학교육학부) ;
  • 김경식 (전북대학교 자연대학 생물과학부)
  • Whang, Sung Soo (Division of Science Education, Chonbuk National University) ;
  • Kim, Kyungsik (Division of Biological Sciences, Chonbuk National University)
  • 발행 : 2001.12.30

초록

벼속(Oryza) 잎의 식물규소체에 대한 분류학적 연구의 일환으로 표징형질을 정립하고 검색표를 작성하고자 광학현미경과 주사전자현미경을 사용하였다. 벼의 잎에서 가장 다양한 형태의 규소체를 형성했던 기공장치규소체, 장세포규소체 그리고 단세포규소체 등을 대상으로 엽신 배축면의 동일한 위치에 형성된 종류를 집중적으로 조사하였다. 이들 규소체의 특징은 속내 분류체계의 설정과 종을 동정하는데 유용하게 사용될 수 있었다. 기공장치규소체는 공변세포와 부세포 상의 유두상돌기 유래 규소체의 발달 유무와 배열 양상의 특징이 다양하게 나타났고, 이들의 특징은 절 및 계열 수준에서 기존 분류체계와 일치하였다. 장세포규소체는 표면에 유두상돌기의 발달 유무, 배열양상 및 형태 등에 따라 다양한 형태가 확인되었다. 그러나 확인된 특징이 본 속내 기존 분류체계와 일치하기보다는, 종의 동정에 유용한 것으로 생각되었다. 단세포규소체는 모두 형판규소체로 십자형, 안장형, 이완형 그리고 3완형 등이 확인되었으며, 이들의 특징은 절 및 계열 수준에서 계통학적으로 의의가 있었다. 또한 단세포규소체가 맥상표피역에 밴드를 형성하는 종류와 밴드를 형성하지 않는 종류, 유관속 종류에 따른 맥상표피역 규소괴의 밴드 수 그리고 맥간표피역에 안장형 규소체의 발달 여부 등에 따라 다양한 종류가 확인되었으나, 이들의 특징이 속내 분류체계와 일치하지 않는 것으로 나타났다. 조사된 기공장치규소체, 장세포규소체 그리고 단세포규소체 등의 특징에 따라 각각 검색표를 작성하였고, 각 형질의 특징과 속내 분류계급과 비교하여 계통학적 의의를 논의하였다.

Phytoliths of leaf blades of Oryza were studied by light and scanning electron microscopy in order to assign the diagnostic character and taxonomic key for the genus. Some phytoliths such as stomatal apparatus, long-cell and short-cell, existing at the same position on the abaxial side of leaf blade, were intensively investigated because of their various forms documented in a previous study. These characters have value either for testing infrageneric classification or for identifying taxa within the genus. Stomatal phytolith is formed by integration of several kinds of sources, such as the guard and subsidiary cell and the papillae. The stomatal phytolith, characterized by not only the absence and presence of phytolith originated by the papillae developed on the guard and subsidiary cell but also their pattern of arrangement, shows various morphologies, and these features have congruent with the infrageneric classification such as section and/or series. Long-cell phytolith is characterized by the absence/presence, arrangement and morphology of phytoliths originated by the papillae on the cell surface. These features may hardly have any systematic relevance within the genus, but contain some informations for identifying of species. All of short-cell phytoliths found are silica body. They form various shapes like cross, bilobate, saddlelike and trilobate, and these features are consistent with infrageneric classification such as section and/or series. Also, some characters, the absence/presence of band of short cell phytolith within costal strip, the absence/presence of saddlelike phytolith within intercostal strip and the number of band of short cell phytolith within costal strip are various according to taxa, but these features do not fall into infrageneric classification. Some taxonomic keys on the phytoliths of stomatal, long-cell and short-cell were developed by their features, and the agreement between these characters and infrageneric classifications was also discussed.

키워드

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