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研究了稀莶属3种植物的染色体核形态结构,除稀莶的染色体数目曾有报道外,毛梗稀莶、腺梗稀莶还未有报道,3种植物的核型为首次报道。它们的静止核均属于复杂染色中心微粒型,分裂前期染色体均属于渐变型。中期体细胞染色体数目都为2n=30,本属的染色体基数为x=15,核型分别为:(1)腺梗稀莶2n=30=29m+1sm,属于1B型;(2)毛梗稀莶2n=30=28m+2sm,属于1B型;(3)稀莶2n=30=2 相似文献
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双花木属和壳菜果属(金缕梅科)的核型研究 总被引:1,自引:1,他引:1
本文对金缕梅科Hamamelidaceae双花木属Disanthus Maxim.的长柄双花木D.cercidifolius subsp.longipes和单种属壳菜果属Mytilaria Lec.首次进行了染色体计数和核型分析。结果表明:长柄双花木与产自日本的双花木D. cercidifolius subsp.cercidifolius的体细胞染色体数目一致,均为2n=16,前者无“st”或“t”染色体,表明该亚种可能比较原始;壳菜果Mytilaria laosensis Lec.的染色体数目为2n=26,x=13。前人报道的金缕梅科染色体基数为x=8和x=12,因此x=13可能是金缕梅科的一个新染色体基数。联系该属的形态特征及其与马蹄荷属Exbucklandia R.W.Brown的关系,作者支持将壳菜果属处理为独立的亚科,即壳菜果亚科Mytilarioideae。 相似文献
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研究了单型属毒药树属Sladerua的核型,并与被认为有关的狭义山茶科、厚皮香科和猕猴桃科等进行了核型比较。毒药树属的体细胞中期染色体数目为2n=48,核型公式2n=4x=48=4M 36m 8sm,核型为2A型,没有发现随体和次缢痕。体细胞间期核为浓密分散型,前期核为中间型。结果表明,毒药树属与相关类群不但在染色体基数上有差异,而且在染色体大小、核型、间期核、前期核以及随体的有无等方面都不尽相同。研究结果不支持目前分子研究的观点,即把毒药树属放在厚皮香科,且认为它与猕猴桃科和狭义山茶科的亲缘关系也较远。 相似文献
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The karyotypes of the genus Whytockia was investigated in order to reveal its sys tematic position in the tribe Klugieae and the evolution of karyotypes within this genus. The
chromosome numbers are 2n=18 with their length over 2.0 µm in all the investigated
species of Whytockia, which represents the most primitive characteristics in the tribe
Klugieae. This paper suggests that x=9 be the primitive basic number of chromosomes in
the Klugieae. The morphology of the resting nuclei in Whytockia belongs to the complex
chromocenter type. The chromosomes at mitotic prophase are classified into the gradient
type. The evolution of karyotypes in Whytockia is toward increase of the chromosomes with
submedian centromeres and especially those with subterminal centromeres. The karyotype of
the variety W. tsiangiana (Hand.-Mazz.)A. Weber var. wilsonii A. Weber is distinctly
different from that of W. tsiangiana var. tsiangiana, which conforms well with the gross
morphology. This paper suggests that this variety be separated from W. tsiangiana as an independent species with affinity to W. bijieensis. 相似文献
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This paper describes for the first time the karyomorphology of 4 populations of 2 species
of Nannoglottis Maxim. s. l. The two species both show the resting nuclei of the complex chromocenter type and the mitotic prophase chromosomes of the interstitial type. The karyotype formula of
N. gynura is 2n = 18 = 14m + 2sm + 2st(SAT) in two populations while that of N. carpesioides is
2n = 18 = 14m + 2sm(2SAT) + 2st in two populations. The two species under study represent two
sections of Nannoglottis s. l. N. gynura, the only species of sect. Stenolepis, is considered as the
most primitive member of the genus. Accordingly, the basic chromosome number of the genus might
be x=9. Karyomorphological data indicate that Nannoglottis should be placed in the tribe Astereaerather than in the Inuleae and the Senecioneae. 相似文献
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本文研究了星叶草属的核形态。其间期核和前期染色体分别为简单染色中心型和中间型;中期染色体较小,长度介于3.00μm到1.20μm之间;核型公式为2n=30=22m+8sm。其明显很高的染色体基数以及其它退化和特化的形态学性状,表明该属是一个孑遗的古多倍体类群。该属与独叶草属在间期核形态、前期染色体形态以及中期染色体的大小和形态方面极为相似。结合其它方面的资料,本文认为星叶草属和独叶草属有较近的亲缘关系,支持将它们一起置于星叶草科的观点。 相似文献
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Reported in the present paper are chromosome numbers and karyotypes of three
genera of the Gesneriaceae, i.e. Ancylostemon Craib. , Briggsiopsis (Franch.) K. Y. Pan
and Lysionotus D. Don. The former two genera are endemic to China. The karyotype of
Ancylostemon aureus (Franch.) Burtt is formulated as 2n = 34 = 20m(1sat) + 14sm, with
the same chromosome number as its allied species A. convexus Craib. This species is characterized by the interphase nucleus of complex chromocenter type and the proximal type of
chromosomes in the mitotic prophase. The chromosome number of the monospecific genus
Briggsiopsis is 2n = 34, the same as the lowest chromosome number reported in Briggsia.
The karyotype of Briggsiopsis, which is formulated as 2n = 25m + 6sm + 3st, also seems to
be primitive among the species of the two genera. Briggsiopsis is characterized by the interphase nucleus of simple-complex chromocenter type and the interstitial-gradient type of chromosomes in the mitotic prophase. The chromosome number of Lysionotus carnosus Hemsl. is
the lowest reported in this genus. Its karyotype is formulated as 2n= 30 = 21m + 5sm + 3st
+ lt. Lysionotus serratus var. pterocaulis, with the karyotype being formulated as 2n= 32
= 2lm + 10sm + lt, has the same chromosome number as var. serratus. These two species
show a remarkable differentiation of karyotypes and are characterized by the interphase nuclei
of simple-complex chromocenter type and the gradient type of chromosomes in the mitotic
prophase. _ . 相似文献
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濒危植物三棱栎四个居群的核型 总被引:1,自引:1,他引:0
报道了濒危植物三棱栎 4个居群的染色体数目和核型 ,4个居群的核型公式均为 2n =14 =10m 2sm 2st 2bs,核型类型均为 2A。间期核为复杂染色中心型 (complexchromocentertype) ,细胞有丝分裂前期染色体为中间型 (interstitialtype)。 4个居群在前期染色体中 ,可观察到2个B染色体 ,但在中期染色体中较少发现。根据核型分析结果 ,4个居群间核型变异不明显 相似文献
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QIONG YUAN QIN-ER YANG 《Botanical journal of the Linnean Society. Linnean Society of London》2006,152(1):15-26
A karyomorphological study of two species in Asteropyrum (Ranunculaceae) and five in presumably related genera (one each in Caltha , Coptis , and Dichocarpum and two in Thalictrum ) reveals close similarities between Asteropyrum and Caltha , but obvious differences between Asteropyrum and Coptis , Dichocarpum , and Thalictrum , in some karyological features, such as the structure of the interphase nuclei, chromosome size, basic chromosome number, and condensation behaviour of chromosomes during the mitotic prophase. The chromosomes of Asteropyrum are categorized as being of the R-type and the basic chromosome number is confirmed as x = 8, indicating a possible close affinity of Asteropyrum to members in the subfamily Helleboroideae, in particular to Caltha and its allies. Asteropyrum peltatum and Asteropyrum cavaleriei are shown to be more or less differentiated from each other in gross morphology and palynology, and somewhat independent in geographical distribution, albeit with intermediate forms occurring where their distribution zones overlap. It seems justifiable to treat them as two subspecies of A. peltatum . © 2006 The Linnean Society of London, Botanical Journal of the Linnean Society , 2006, 152 , 15–26. 相似文献
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鸡爪草属的染色体及其系统位置 总被引:1,自引:0,他引:1
本文研究了毛茛科鸡爪草Calathodes oxycarpa的核形态。其静止核和有丝分裂前期染色体分别属于复杂中央染色微粒型和中间型,中期染色体属于R型,核型公式为2n=16=8sm 8st(2sat)。据此并结合有关资料,讨论了鸡爪草属与毛茛科其它类群的亲缘关系,认为鸡爪草属与金莲花属和特产于南朝鲜的Megaleranthis属是极为近缘的类群,不宜将它们分开置于不同的族或亚科中。 相似文献
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大吴风草(菊科:千里光族)的核形态及其系统学意义 总被引:1,自引:0,他引:1
研究了大吴风草属的核形态,染色体间期为复杂型;前期 色体为中间型,染色体长度从3.70μm到2.64μm,平均长度为3.20μm;核型公式为2n=60=14m 26sm 20st(4SAT),为3A类型。过去认为大吴风草属与橐吾属接近,并比之原始,但染色体和花粉特征并不支持这种处理。 相似文献
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研究了款冬属的核形态。染色体间期为简单型与复杂型的过渡型;前期染色体为近基型与中间型的过渡型。染色体较小,核型不对称,具明显的二型性;数目与核型公式为2n=60=42m+10sm+6st+2t。比较发现款冬的核型明显不同于千里光族中已有的核型记载,其核型特征似乎与它独特的形态特征相联系,具有重要的系统学意义。 相似文献
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本文对鸭跖草科的穿鞘花Amischotolypehispida(LessetA.Rich.)Hong进行了核形态研究。其静止核和有丝分裂前期染色体分别属于复杂中央染色微粒型和中间型;染色体数目为2n=36,核型公式为2n=4m+28sm+4st。本种的核型为首次报道。 相似文献
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Investigated in the present work was the karyomorphology of Ligulariopsis Y. L. Chen.
The interphase nuclei were categorized to be the complex chromocenter type, and the mitotic
prophase chromosomes were categorized to be the interstitial type. The metaphase chromosomes
ranged from 2.70 μm to 4.70μm with the average 3.62 μm in length. The karyotype was formulated as 2n = 58 = 34m + 18sm(2sat) + 6st and belonged to 2A type. The karyomorphological characteristics of Ligulariopsis are very similar to those of Ligularia and Parasenecio, but there are moresubmedian-centromeric and median-centromeric chromosomes in Ligulariopsis. 相似文献
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Reported in this paper was the karyomorphology of the monotypic genus Pomatosace Maxim. The interphase nuclei and prophase chromosomes of P. filicula Maxim. were categorized to be complex chromocenter type and interstitial type respectively; themetaphase chromosomes were counted to be 2n = 20, ranging in length from 6.4µm to 4.1µm; the karyotype was formulated as 2n= 18m + 2sm, with the karyotype asymmetry belonging to 2A. The similar karyomorphological characteristics of interphase nuclei and prophase chromosomes between Pomatosace and Androsace, together with the similar sizeand morphology of their metaphase chromosomes, support the viewpoint that they are closelyrelated. 相似文献
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毛茛科鸭跖花属的核形态研究 总被引:1,自引:0,他引:1
研究了毛茛科鸭(足石)花属Oxygraphis Bunge 3种植物的核形态。其间期核均为复杂中央染色微粒型,前期染色体为中间型,染色体基数为x=8。脱萼鸭(足石)花O.delavayi的染色体明显大于鸭(足石)花O.glacialis和细叶鸭(足石)花O.tenuifolia的染色体。结果支持鸭(足石)花属是毛茛科毛茛亚族subtrib.Ranunculinae的一个自然成员以及脱萼鸭跖花可能是该属的原始种的观点。 相似文献
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YANG Qin-Er 《植物分类学报:英文版》2000,38(4):350-354
Three species of the genus Oxygraphis Bunge (Ranunculaceae) were karyomorphologically studied. The interphase nuclei of complex chromocenter type, prophase chromosomes of interstitial type and basic chromosome number of x = 8 were common to all the three species examined,
but the chromosomes of O. delavayi were markedly larger than those of O. glacialis and of O.
tenuifolia. The results support the viewpoints that Oxygraphis is a natural member of the subtribe
Ranunculinae Spach, tribe Ranunculeae DC. in the subfamily Ranunculoideae and that O. dela-vayi might be the primitive species of this genus. 相似文献