沙冬青染色体数目及核型的研究     

张寿洲  曹瑞 《中国科学院研究生院学报》1990,28(2):133-135

本文首次报道了沙冬青的染色体数目及核型，沙冬青  Ammopiptanthus mongolicus (Maxim.)Cheng f.染色体基数目为x＝9，其核型公式为  2n=18=4m十14sm(2SAT)。  相似文献   

长筒石蒜的染色体核型分析     

徐炳声  黄少甫  毛宗国  俞志洲  林巾箴 《中国科学院研究生院学报》1984,22(1):43-45

A karyotypic analysis of Lycoris longituba Y. Hsu et Fan was carried out. The voucher specimen, Z. G. Mao 10501, is preserved in the Herbarium of Hangchow Botanical Garden. The chromosome number in root tip cells of the species is found for the first time to be 16, among which 6 are large, V-shaped with submedian primary constric- tions, and the other 10 are short, rod-shaped  with terminal primary constrictions. Photomi- crograph of the chromosome complement and idiogram are given in Fig. 1-3 respectively. The karyotype formula of the species is therefore 2n=16=6m+6t+4t (SAT) in the light of the chromosomal terminology defined by Levan and al.[5]      Based on the view stressed by Jones[3] and Brandham[4], successive fusion of the ch- romosomes should be taken as the essential mechanism for karyotype evolution and specia- tion in Lycoris. Reciprocal translocation, with the loss of one of the centromeres, might be the mechanism of origin for a V chromosome. It is, then, suggested that the decrease in ch- romosome number as a result of fusion of the rods with terminal or subterminal primaryconstrictions has taken place in the speciation of L. longituba.  相似文献   

吉祥草染色体核型的研究     

徐炳声  李林初 《中国科学院研究生院学报》1984,22(2):128-130

Karyotype analysis for the species Reineckia carnea (Andr.) Kunth of the mo- notypic genus Reineckia Kunth is given for the first time. The number of chromosomes in root-tip cell was found to be 38, which is in accord with those reported by most of the pre- vious authors[5,7,8,9,11,12,]. The somatic complement shows a slight variation in size, i.e., the 2, 3, 5, 6, 7th pairs of the chromosomes have submedian constrictions, while the other pairs have median centromeres. The karyotype is therefore a rather symmetrical one, and accor- ding to the chromosomal terminology defined by Levan et al[4], the karyotype formula of the species is 2n=38=28 m+10 sm. In spite of the presence of two nucleoli in the te- lophase as observed by the authors and Noguchi[8] as well, the two corresponding Sat-chro- mosomes have not been found.  Photomicrograph of the chromosome complement and idiog- ram are given in Fig. 1 and 2 respectively.  相似文献   

降香檀的核型分析     

黄少甫  赵冶芬  陈忠毅 《中国科学院研究生院学报》1984,22(3):250-251

The present paper describes for the first time the karyotype of Dalbergia odorifera T. Chen,  a medicinal tree endemic to Hainan (Guang dong),  China. The plant is shown to have 20 somatic chromosomes (2n=20),  two of which (the third pair) are sub- metacentric (sm),  and all the others are metacentric (m) (Fig. 1-2). The voucher andits conservation are given.  相似文献   

中国毛茛属新分类群及其核型     

廖亮  徐玲玲 《中国科学院研究生院学报》1997,35(1):57-62

新种R．shuichengensis L，Liao有两种核型类型，即基本型2n=2x=16=4m+2sm+10st(2SAT)；杂合型2n=2x=16=4m+2sm+9st(1SAT)+1t(1SAT)，其核型和近缘种R．trigonus Hand．- Mazz.核型相似，但其随体染色体短臂比后者更小而不同。新变种R．silerifolius var．dolicanthus L. Liao核型(2n=2x=16=4m+2sm+10st(2SAT)与原变种Var．silerifolius不同。根据形态和染色体的特征，我们认为本文中两个新分类群和R．Trigonus是国产毛茛组中x=8至x=7的过渡类群。  相似文献   

披碱草属6种植物的核型研究     

时英  郭本兆  李建华 《中国科学院研究生院学报》1989,27(3):215-221

本文首次报道特产于我国青藏高原披碱草属Elymus的6种植物的染色体数目和核型。6个种的染色体数目为2n＝42，都是6倍体。它们的核型是：黑药鹅观草，2n=6x＝42=32m+10sm;糙毛鹅观草，2n=6x=42=34m+8sm；大颖鹅观草，2n=6x=42=30m+12sm；疏花鹅观，2n=6x=42=32m+10sm；青海鹅观草，2n=6x= 42＝34m十8sm；长颖鹅观草，2n=6x＝42=34m十8sm。它们的核型属1B或2B型，染色体中均未发现随体。  相似文献   

贝母属三个分类群的核型研究     

王志安 《中国科学院研究生院学报》1992,30(1):69-72

本文对浙贝Fritillaria thunbergii Miq．(取材于浙江鄞县和舟山)、东贝 F.thunbergii var． chekiangensis Hsiao et K.C.Hsia和皖贝F.anhuiensis S．C.Chen et S．F.Yin的核型进行了分析比较， 其中东贝和浙贝(舟山)为首次报道．浙贝的核型：取材于浙江鄞县的为2n=24=4m(1sc) l)+4st(1sc) +16t(1sc)，取材于浙江舟山为  2n=24=2m+2sm+12st(1sc)+8t(2sc)，东贝的核型为 2n＝24=2m+2sm+8st(2sc)+12t(4sc)，皖贝的核型为2n=24=2m+2sm+8st(2sc)+12t(5sc)。3个分类群均属3B核型。  相似文献   

秃杉的细胞学研究     

李林初 《中国科学院研究生院学报》1986,24(5):376-381

本文首次报道秃杉的核型为K(2n)=22=16m+6sm,  3号染色体具“长着丝点区 域”。似具比同属的台湾杉(18m+4sm)进化的趋势。它们均为"2B"。从国产杉科植物的 核型类型看,似见"2B"的台湾杉属与"1B"的杉木属和"1A"的水杉属、水松属、柳杉属的亲缘关系依序由近到远并比它们进化。本作者还观察了秃杉的核仁数目和多微核现象。  相似文献   

拟鹅观草属6种2亚种和鹅观草属3种植物的核型研究     

丁春邦  周永红  郑有良  杨瑞武  魏秀华 《中国科学院研究生院学报》2004,42(2):162-169

对拟鹅观草属Pseudoroegneria 6种2亚种和鹅观草属Roegneria 3种植物的核型进行了研究,核型公式如下：P. spicata (Pursh) A. Lve，2n=2x=14=12m (2sat)+2sm; P. strigosa ssp. aegilopoides (Drobov) A. Lve，2n=2x=14=12m (2sat)+2sm; P. libanotica (Hackel) A. Lve，2n=2x=14=10m+4sm (4sat); P. stipifolia  相似文献   

国产12种乌头属和18种翠雀属植物的细胞学研究     

杨亲二 《中国科学院研究生院学报》2001,39(6):502-514

研究了12种乌头属Aconitum L．和18种翠雀属Delphinium L．植物的染色体。在12种乌头属植物中，除粗花乌头A．crassiflorum为四倍体(2n=4x=32)外，其他种类都为二倍体(2n=2x＝16)，中甸乌头 A.piepunense中有B染色体存在，牛扁亚属Aconitum subgen．Lycoctonum的二倍体植物与乌头亚属Aconitum subgen．Aconitum 植物的染色体在大小和形态上有明显区别；所有18种翠雀属植物都为二倍体(2n＝2x=16)，其染色体在大小和形态上极为相似，但与乌头亚属的染色体易于区别。翠雀属植物的核型不对称性程度明显高于乌头属植物，因此从染色体证据来看，翠雀属要比乌头属进化。  相似文献