CAJ | 학술논문

通过扫描电镜对澜沧荛花Wikstroemia delavayi花部的形态发生过程进行了观察和分析,旨在为该属的系统学研究提供花部发育形态学资料.澜沧荛花花部的发生和早期发育呈远轴面向近轴面的顺序,但这一式样由于近轴面的器官在早期发育之后生长加速发生了转变.因此,花开放时所表现的所谓辐射对称,显然是由同一轮器官的异率生长所导致的次生现象.花盘发生于花萼筒基部的远轴面上,与花萼、雄蕊的发生间隔时间较长.花盘原基在下轮雄蕊着生处凹陷或间断,与之相对应,花盘裂片与下轮雄蕊呈互生.由此,花盘显然不是花托的一部分,也不是象花萼、雄蕊和心皮一样的独立结构,将其解释为雄蕊群的一部分更合理.花盘的发生和早期发育及其着生位置同其他花部器官的发生和发育式样具有明显的相关性,这种相关性对进一步阐明瑞香属Daphne和荛花属Wikstroemia的系统发育关系具有一定意义.根据对雌蕊群的发生和发育过程观察,该种的子房是由一个近轴面的可育心皮和一个远轴面的不育心皮融合而成的单室子房,为假单心皮雌蕊.尽管荛花属和瑞香属均属于单室子房,但澜沧荛花的子房维管束中的腹束排列于中轴位置,而目前资料显示瑞香属植物的腹束接近于侧膜位置,这方面仍需进一步研究.
통과소묘전경대란창요화Wikstroemia delavayi화부적형태발생과정진행료관찰화분석,지재위해속적계통학연구제공화부발육형태학자료.란창요화화부적발생화조기발육정원축면향근축면적순서,단저일식양유우근축면적기관재조기발육지후생장가속발생료전변.인차,화개방시소표현적소위복사대칭,현연시유동일륜기관적이솔생장소도치적차생현상.화반발생우화악통기부적원축면상,여화악、웅예적발생간격시간교장.화반원기재하륜웅예착생처요함혹간단,여지상대응,화반렬편여하륜웅예정호생.유차,화반현연불시화탁적일부분,야불시상화악、웅예화심피일양적독립결구,장기해석위웅예군적일부분경합리.화반적발생화조기발육급기착생위치동기타화부기관적발생화발육식양구유명현적상관성,저충상관성대진일보천명서향속Daphne화요화속Wikstroemia적계통발육관계구유일정의의.근거대자예군적발생화발육과정관찰,해충적자방시유일개근축면적가육심피화일개원축면적불육심피융합이성적단실자방,위가단심피자예.진관요화속화서향속균속우단실자방,단란창요화적자방유관속중적복속배렬우중축위치,이목전자료현시서향속식물적복속접근우측막위치,저방면잉수진일보연구.
Floral morphogenesis of Wikstroemia delavayi Lecomte was investigated by scanning electron microscope (SEM) and compared with its allied groups. Initiation and early development of floral parts in W. delavayi followed unidirectional sequences from the abaxial side to the adaxial side. Because the floral parts grew faster at the adaxial side than at the abaxial one in following development, the zygomorphic pattern in the early development changed and finally became an almost actinomorphic form at anthesis. The disc was initiated from the abaxial base of the floral tube and its lobes were alternate with lower whorl stamens. According to this initiatial and developmental pattern, it is reasonable to interpret the disc as a part of the androecium rather than a modification of the receptacle. The located position and development of the disc was correlative with the development of other floral organs, which might provide insight to delimit Wikstroemia and Daphne based on different floral developmental pattern that might exist between the two genera. The developmental process of W. delavayi indicated that the syncarpous and uniloculate gynoecium was in fact bicarpellate, which consisted of a fertile carpel and a sterile one. It was pseudomonomerous. Even though the ovary in both Wikstroemia and Daphne was uniloculate, the location of the ventral bundles in the ovary was obviously different from each other according to data to date. In this respect, further investigation is undertaken between the two genera.