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1.
十字花科四属植物叶片脉序的比较研究 总被引:7,自引:0,他引:7
对十字花科有争议的岩荠属Cochlearia,泡果荠属Hilliella,阴山荠属Yinshania,棒毛荠属Cochleariella植物的叶片脉序进行了研究。结果表明:岩荠属为环结曲行羽状脉,泡果荠属为直行羽状脉,阴山荠属为半直行羽状脉,棒毛荠属种的叶脉与浙江泡果荠相似。前3属植物在网眼的大小,叶缘末级脉和叶先端的形态上也存在着差异。据此作者认为岩荠属,泡果荠属和阴山荠属这3属植物分开是合理的,但棒毛荠属的分类地位值得进一步研究。还得出这几个属的叶脉演化关系是;基出完全掌状脉→环结曲行羽状脉→直行羽状脉。 相似文献
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泡果荠属Hilliella和阴山荠属Yinshania是十字花科中国特有的两小群植物,但是,它们的分属界定却一直颇有争议。本文结合前人的研究结果重新对这两群植物做了研究,从而进一步确认这两群植物应该界定为两个属,即泡果荠属和阴山荠属。文中比较了两属间重要的性状特征,并指出它们的主要区别在于:泡果荠属果实无假隔膜,种子较大,表面具小瘤状突起,染色体倍性为六倍体(2n=6x=42);而阴山荠属果实有假隔膜,种子较小,表面具网纹,染色体倍性为二倍体(2n=2x=12)。两属其他方面如叶形态、叶表皮结构、被毛类型 相似文献
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十字花科一新属——泡果荠属 总被引:9,自引:2,他引:9
岩荠属泡果荠组植物(Cochlearia L.Sect.Hilliella O.E.Schulz)不仅在体态上而且在其它一系列特征特别是具泡状突起的果实特征上极不同于狭义的岩荠属(Cohc-learia L.s.str.),松蓝叶岩荠属[Glaucocochlearia(O.E.Schulz)Pobed.],以及拟常绿岩荠属[Pseudosempervium(Boiss)Grossh.]。这些特征看来可以作为建立一新属的根据,因此将其提升为一独立的属并把这一组的8个种组合到新属中去。 相似文献
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阴山荠属和泡果荠属的数量分类研究 总被引:2,自引:1,他引:2
阴山荠属和泡果荠属隶于十字花科,两属有一些共同特征,也有一系列性状差异,数量分类结果支持两属处理为各自独立的属。本文同时对属下类群和一些种间关系进行了讨论。 相似文献
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阴山荠属和泡果荠属植物染色体数目及过氧化物酶同工酶的比较 总被引:2,自引:0,他引:2
张渝华 《植物资源与环境学报》1995,4(2):27-31
阴山荠属和泡果荠属受试种类的染色体数目是:柔毛阴山荠(Y.henryi(Oliv.)Y.H.Zhang)2n=12,叉毛阴山荠(Y.furcatopilosa(Kuan)Y.H.Zhang)2n=12,双牌泡果荠(H.shuangpaiensisZ.Y.Li)2n=44,黟县泡果齐(H.yicianensisY.H.Zhang)2n=42,双牌泡果(H.pardoxa(Hance)Y.H.Zhan 相似文献
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Haec species proxima H.changhuaensi Y. H.Zhang,a qua racemis longioribtus,laxioribus,siliculis longe obovoideis,stylis longlogioribus sub fructu c. 2 mm longis,seminibus superificie tuberculis minoribus dense munitis recedit. 相似文献
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泡果荠属(十字花科)五新种 总被引:3,自引:1,他引:3
长柱泡果荠 图1 Hilliella longistyla Y.H.Zhang,sp.nov. Haec species proxima H.changhuaensi Y.H.Zhang,a qua racemis longio-ribus,laxioribus,siliculis longe obovoideis,stylis longioribus,sub fructu c.2mmlongis,seminibus superificie tuberculis minoribus dense munitis recedit. Herba annua.Caulis erectus,c.42cm vel ultra altus,2.5—3mm crassus,striatus,nodis hispidulis.Folia caulina mediana et suprema trifoliolata;foliolamembranacea vel chartacea,subtus et supra ad nervos strigosa,nervis lateralibus 5 相似文献
10.
阴山荠属一种兼论该属的演化和地理起源问题 总被引:1,自引:0,他引:1
本文描述了阴山荠属一新种-鄂西阴山荠Yinshania exiensis Y.H.Zhang。新种隶阳山荠系,但形态特征介于阴山荠系的察隅阴山荠和密毛系的叉毛阴山荠之间,分布在鄂西一带。阴山荠属属下系统有2组2系,在研究了本属主要性状特征的演化方向后,本文认为阴山荠组是较原始的一群,小果组是较进化的一群。四川西部及其邻近地区是本属的近代分布区中心或分化中心,本属也可能是从该地区分化起源的。 相似文献
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中国十字花科(Cruciferae)的地理分布 总被引:9,自引:0,他引:9
在评述十字花科(Cruciferae)分类系统,分析主要性状演化趋势和科、属分布的基础上,提出中国十字花科植物可能是本土起源的观点,其起源中心和分布中心可能在以青藏高原为主体的西部高山和丘陵地区,起源时间至少在第三纪晚期以前,并认为中国十字花科植物自起源地(青藏高原)可能有3条主要的散布途径:第1条是自青藏高原向东北部,沿宁夏、陕西、内蒙古、山西、河北,到达东北大小兴安岭一带,并在蒙古高原及东北山地形成次分布中心;第2条自青藏高原向东,经重庆、湖南、湖北,沿长江流域分布,到达东部沿海一带;第3条自青藏高原向东南部,经贵州、广西、广东、福建,延伸到台湾。 相似文献
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In this paper we study aspects of the breeding system of Hormathophylla spinosa (Crucifcrae) to identify the factors responsible for seed production in the absence of insect pollinators. The pollinator-exclusion experiments show that H. spinosa, under natural conditions, does not produce seed by apomixis or spontaneous autogamy. H. spinosa appears to be self-incompatible but slightly geitonogamous. Thus, this plant species needs pollen vectors for reproduction. The results of the wind-exclusion experiments performed during two different years in two populations of H. spinosa support the hypothesis that the wind acts as a pollen vector; flowers excluded from the wind had a lower fruit set and female fertility than flowers excluded from all pollinator insects (winged and wingless). This generalist pollination system (insects and wind) permits this species to colonize and sustain viable populations in high mountains, where this species is the only woody shrub living above 3000 m above sea level in the Sierra Nevada. 相似文献
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Mona M. Marzouk Abdel-Salam M. Al-Nowaihi Salwa A. Kawashty Nabiel A.M. Saleh 《Biochemical Systematics and Ecology》2010
The flavonoids of nine selected species belonging to different tribes of family Brassicaceae (Cruciferae) native to Egypt were surveyed, viz. Rorippa palustris, Coronopus squamatus, Eremobium aegyptiacum, Moricandia nitens, Brassica tournefortii, Farsetia aegyptia, Matthiola livida, Anastatica hierochuntica and Sisymbrium irio. Thirty-eight compounds were isolated and identified, which included six flavonol aglycones, 24 flavonol glycosides including 14 flavonol 3,7-diglycosides, one flavone aglycone, three flavone O–glycosides, two glycoflavones and two dihydroflavonoids. A numerical analysis based on a combination of 97 morphological, anatomical and chemical characters revealed two series, two subseries, two clusters and two groups. The interrelationships between the studied species are discussed. 相似文献
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K. ARORA J. GRACE F. STEWART 《Botanical journal of the Linnean Society. Linnean Society of London》1982,85(3):169-177
Leaf surfaces of the native Heracleum sphondylium, the alien Heracleum mantegazzianum and the interspecific hybrid were examined using SEM and light microscopy. The surfaces differed in hairiness, especially in the length of the hairs, although the hairs did not differ in general form, or distribution on the leaf surface. Stomata differed little in length, width or frequency, but there were differences in the sort of stomata in relation to the surrounding epidermal cells. The hybrid material was intermediate between the parental species, and sometimes displayed aberrant trichomes that were contorted in contiguous pairs. The results are discussed in relation to other work on the epidermal features of the Umbelliferae: as a means of discriminating the three taxa, and in relation to the ecological distributions of the species. 相似文献
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K. ARORA J. GRACE F. STEWART † 《Botanical journal of the Linnean Society. Linnean Society of London》1972,65(3):169-177
Leaf surfaces of the native Heracleum sphondyliutn , the alien Heracleum mantegazzianum and the interspecific hybrid were examined using SEM and light microscopy. The surfaces differed in hairiness, especially in the length of the hairs, although the hairs did not differ in general form, or distribution on the leaf surface. Stomata differed little in length, width or frequency, but there were differences in the sort of stomata in relation to the surrounding epidermal cells. The hybrid material was intermediate between the parental species, and sometimes displayed aberrant trichomes that were contorted in contiguous pairs.
The results are discussed in relation to other work on the epidermal features of the Umbelliferae: as a means of discriminating the three taxa, and in relation to the ecological distributions of the species. 相似文献
The results are discussed in relation to other work on the epidermal features of the Umbelliferae: as a means of discriminating the three taxa, and in relation to the ecological distributions of the species. 相似文献
17.
Differentiation of freezing tolerance and vernalization responses in Cruciferae exposed to a low temperature 总被引:1,自引:0,他引:1
High levels of freezing tolerance were induced in leaves of different Cruciferae species including Brassica napus, Arabidopsis thaliana, Barbarea vulgaris, Thlaspi arvenses and Descurainia sophia by low-temperature acclimation. Concomitantly, the amount of total RNA doubled in these three species. Analyses of methylation patterns and dosage of rRNA genes were carried out to determine whether or not alterations occur in this DNA during development of freezing tolerance. Hybridizations of Southern transfers with an rDNA probe revealed two additional EcoRI sites in purified DNA isolated from freezing-tolerant leaves of winter B. napus cv Jet Neuf and D. sophia (both of which require low temperatures for vernalization), but not in isolates of A. thaliana or spring B. napus cv Topas. An increase of rDNA cistrons was also observed in both B. napus cv Jet Neuf and D. sophia but not in A. thaliana or B. napus cv Topas upon cold acclimation. These results suggest that low temperature induced amplification of rDNA and the differential methylation of EcoRI sites may possibly be related to the vernalization process but may not be related to the development of freezing tolerance. However, the higher activity of RNA polymerase (2.5 times more) observed upon cold acclimation may explain the concomitant increase in total RNA and may be related to the development of freezing tolerance in the Cruciferae. 相似文献
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大叶紫薇叶的化学成分研究 总被引:1,自引:0,他引:1
从大叶紫薇叶子中分离鉴定了4个化合物,分别为23-羟基熊果酸(1)、alphitolic acid(2)、熊果酸(3)和β-谷甾醇(4),这4个化合物均为首次从该植物中分离得到。 相似文献