은행나무 幼植物에 있어서 反應組織의 分化에 대한 解剖學的 硏究 = Anatomical Studies on the Differentiation of Reaction Tissues in Ginkgo biloba L. Seedling

국문 초록 (Abstract)

본 연구는 중력자극에 대하여 식물체의 1期生長으로부터 이어지는 2期生長 중에 일어나는 생장 반응과 관련지어 維管束組織의 發生上의 變化를 구명하기 위하여 은행나무 幼植物의 第1節間의 수평생장 중에 일어나는 反應組織의 발생과정을 연구하였다.
수평생장한 은행나무 幼植物의 第1節間에서 壓縮材의 발생과정은 점진적인 과정으로 나타났다. 수평생장한 第1節間의 下部에서 壓縮材의 발생과정은 기부에서 정단부를 향해 구정적으로 일어났다. 反應材의 解剖學的 特性들이 1期 維管束에서도 나타나기 시작되어, 2期生長 중에 나타나게 된다. 假導管의 길이와 측벽무늬의 미세구조를 비교 관찰한 결과, 第1節間의 下部에서 假導管의 길이가 다소 길게 나타났고, 放射組織의 높이는 下部에서 다소 높게 나타났다.

다국어 초록 (Multilingual Abstract)

In order to elucidate the formation of reaction tissues during the transition from primary to secondary growth, the developmental anatomy was conducted in the first internode of Ginkgo biloba seedling in horizontal position. The righting of the horizontal first internode took place at the middle portion and gradually proceeded to the base during the primary growth. Reaction tissues were formed corresponding to the righting movement in the horizontal first internode. During the transition from primary to secondary growth, compression wood was gradually developed on the lower side only. The anatomical features of compression wood also extended longitudinally to the lower side of vertical portion where it coincided with the lower side of the horizontal portion. Thus, compression wood formation in the lower side of the horizontal first internode occurs acropetally from basal to apical portion. Eventually, some of the anatomical features of compression wood occurred at the primary growth. And the typical compression wood is gradually established during the secondary growth. On the other hand, the lower side tracheid and ray were longer and higher than those of the upper side in the horizontal first internode. However, difference in the width of ray was not observed between the lower and upper sides.