CAJ | 학술논문

对埃及白睡莲的大、小孢子的发生,雌、雄配子体的发育,以及胚和胚乳的发育进行了观察研究.结果表明埃及白睡莲的花药壁由5层细胞组成,绒毡层细胞具双核,属于分泌型.小孢子母细胞减数分裂时,胞质分裂属于同时型,小孢子四分体呈四面体型.成熟花粉为三细胞类型,花粉粒表面具有环沟.胚珠为倒生型、双珠被、厚珠心,珠孔仅由内珠被形成.大胞子母细胞减数分裂形成三分体,合点端2个细胞退化,珠孔端1个细胞发育为功能性大胞子.成熟雌配子体由4细胞组成,即2助细胞,1卵细胞和1中央细胞.合子的第一次分裂是横向的,形成的基细胞不再分裂,体积增大后成为一个大的胚柄细胞.而顶细胞进行一系列分裂形成胚.在此基础上,还比较了睡莲目不同属的胚胎学特征.
대애급백수련적대、소포자적발생,자、웅배자체적발육,이급배화배유적발육진행료관찰연구.결과표명애급백수련적화약벽유5층세포조성,융전층세포구쌍핵,속우분비형.소포자모세포감수분렬시,포질분렬속우동시형,소포자사분체정사면체형.성숙화분위삼세포류형,화분립표면구유배구.배주위도생형、쌍주피、후주심,주공부유내주피형성.대포자모세포감수분렬형성삼분체,합점단2개세포퇴화,주공단1개세포발육위공능성대포자.성숙자배자체유4세포조성,즉2조세포,1란세포화1중앙세포.합자적제일차분렬시횡향적,형성적기세포불재분렬,체적증대후성위일개대적배병세포.이정세포진행일계렬분렬형성배.재차기출상,환비교료수련목불동속적배태학특정.
In this paper,we observed the megasporogenesis,microsporogensis,femate and mate ganmetophyte development,embryo and endosperm development in Nymphaea lotus.The anther wall consists of an outer epidermis,an endothecial layer,two middle layers,and a tapetum.The tapetum is secretory and its cells are binuclei.The microspore mother cells undergo simultaneous cytokinesis following the meiotic divisions,which results in the formation of tetrahedral microspore tetrads.The pollen contains three cells when shed,with an encircling latitudinal band-like aperture on their surface.The ovule is anatropous,bitegmic,and crassinucellate,with the micropyle formed only by the inner integument.Meiosis of the megaspore mother cell results in the production of a linner triad of megaspores.The two micropylar megaspore cells degenerate while the chalazal one acts as the functional megaspore.The mature female gametophyte contains four cells(an egg cell,two synergids,and a uninucleate central cell).The first division of zygote is transverse and forms a basal cell and a apical cell.The basal cell does not divide,but increases in size,acting as a unicellular funiculus,while the apical cell divides many times.On the foundation,we also compared the embryological characters of the genera of the Nymphaeales in this paper.