[논문]개승마속(Aruncus L., 장미과)의 화분형태학적 연구

옥민경; 홍석표

doi:10.11110/kjpt.2015.45.4.323

개승마속(Aruncus L., 장미과)의 화분형태학적 연구
Pollen morphology of the genus Aruncus L. (Rosaceae) 원문보기

식물분류학회지 = Korean journal of plant taxonomy, v.45 no.4, 2015년, pp.323 - 331

옥민경 (경희대학교 이과대학 생물학과) , 홍석표 (경희대학교 이과대학 생물학과)

초록
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개승마속 내 7분류군이 갖는 화분형태학적 형질변이의 분류학적 유용성을 알아보기 위하여 주사전자현미경을 사용하여 자세히 관찰하였다. 본 속의 화분은 단립으로 크기는 소립($P=8.33-12.57{\mu}m$, $E=8.93-14.40{\mu}m$)이며, 극축면에서는 아원형에서 원형의 형태를, 적도면에서는 아단구형에서 약장구형에 걸친 형태를 나타내고(P/E = 0.68-1.70), 과립상 돌기를 지닌 3공구형의 발아구를 갖는 것으로 확인되었다. 화분의 표면무늬는 기본적으로 유선상의 특징을 지니고 있으나, 천공의 유무, 유선과 유선 사이의 너비 등에서는 차이를 보여주었다. 특히, A. dioicus var. acuminatus는 속내의 다른 분류군에 비해서 상대적으로 짧고 높게 솟아있는 유선을 갖는 특징으로 구분됨을 확인하였다. 화분학적 형질을 종합한 결과, 개승마속의 다양한 화분학적 변이의 조합은 속 내 일부 분류군을 구별하는데 유용한 것으로 나타났다.

Abstract ▼ AI-Helper

Pollen morphological characteristics of 7 taxa of the genus Aruncus L. (Rosaceae) were examined using scanning electron microscopy (SEM) to evaluate the taxonomic implication within the genus. Aruncus pollen grains were monad, tri-colporate with granular membranes, small in size ($P=8.33-12.57{\mu}m$, $E=8.93-14.40{\mu}m$), amb is sub-circular to circular, suboblate to prolate-spheroidal in shape (P/E = 0.68-1.70). The sexine ornamentation in all studied taxa was basically striate but existence of perforation (striate-perforate: A. dioicus, A. dioicus var. acuminatus, A. dioicus var. astilboides, A. dioicus var. pubescens, A. dioicus var. vulgaris; striate-pstilate: A. dioicus var. aethusifolius, A. gombalanus) and the widths of muri and grooves varied according to the taxa. In particular, relatively short, and sharply crested muri being a distinct feature of A. dioicus var. acuminatus. As a result, the various combination of each pollen characteristics could be useful to identify the some taxa of the genus Aruncus.

주제어

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문제 정의

Here, we document detailed pollen morphology within the genus Aruncus based on SEM, to explore the potential taxonomic implications of pollen characters. We also identify the palynological characters that might be useful for taxa identification.

제안 방법

For each taxa, polar axis (P), equatorial diameter (E), equatorial diameter in polar view (EDPV), diameter between the apices of two ectocolpi (AC), polar area index (PAI), width of muri (WM) and width of grooves (WG), WM/WG ratio (M/G) of sexine ornamentation were measured on SEM images using Macnification software (version 2.0, Orbicule Inc, Leuven, Belgium). In particular, WM and WG were measured on the middle area of striation to exclude junction of striation.

이론/모형

Pollen grains were prepared by critical point drying method. For morphological observation of pollen grains, dried flowers were first rehydrated with Agepon^® (Agfa Gevaert, Leverkusen, Germany; Agepon wetting agent: distilled water, 1 : 200) before dehydration to recover their original shape.

후속연구

Further, the fine variations in sexine ornamentation, such as the thickness or pattern of striae, may provide additional taxonomic significance among the taxa. Therefore, more detailed study of pollen wall stratification through transmission electronic microscope (TEM) is required. Such study may be helpful in elucidating the infrageneric relationships between Aruncus taxa.
gombalanus were not observed by using SEM. To obtain additional clues and resolve the obscure interspecific delimitation within this genus, further morphological study of Aruncus pollen is necessary.
diocus var. aethusifolius, further study is necessary.

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