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991.
992.
993.
The genus Swertia is one of the large genera in Gentianaceae, including 154
species, 16 series and 11 sections. It is disjunctly distributed in Europe, Asia, Africa and N.
America, but entirely absent from Oceania and S. America.
According to Takhtajan’s (1978) regionalization of the world flora, Swertia is found in
14 regions. Eastern Asiatic region with 86 species, of which 58 are local endemics, 13 series
and 9 sections, ranks the first among all the regions. The highest concentration of the taxa
and endemics in Eastern Asiatic region occurs in SW China-Himalayan area (Sikang-Yunnan
P. , W. Sichuan, W. Yunnan-Guichou Plateau of China and NE. Burma, N. Burmense P. ,
E. Himalayan P. and Khasi-Manipur P. ). In this area there are 74 species (48 endemics),
12 series, and 9 sections; thus about half species of the world total, three quarters of series
and 82% of sections occur in this small area. Besides, the taxa at different evolutionary
stages in Swertia also survive here. It is an indication that SW. China-Himalayan area is a
major distribution centre of the genus Swertia. In addition, Sudan-Zambezian Region in
Africa, with 22 species, 4 series and 2 sections, is a second distribution centre.
The primitive type of the genus Swertia is Sect. Rugosa which consists of 2 series and
23 species. It is highly centred in the mountains of SW. China (Yunnan, Sichuan, Guizhou
and SE. Xizang) where 2 series and 16 species occur. Among them 15 species of Ser. Rugosae were considered as the most primitive groups in this genus. From our study, the outgroup of Swertia is the genus Latouchea Frahch. , which is distributed in Yunnan, Sichuan,
Guizhou, Hunan, Guangdong, Guangxi and Fujian. The two groups overlap in distribution
in SW. China. According to the principle of common origin, the ancestor of two genera ap peared most probably in this overlapping area. It was inferred that SW. China Was the birth-place of the genus Swertia.
Four sections of Swertia have different disjunct distribution patterns: Sect. Ophelia is of
Tropic Asia, Africa and Madagascar disjunct distribution; sect. Swertia is of north temperate distribution; sect. Spinosisemina is in Tropical Asia (Trop. India to S. China and Philipines); sect. Platynema also is in Tropical Asia (Java, Sumatra, Himalayas to SW. China).
These disjunct patterns indicate that the Swertia floras between the continents or between
continent and islands have a connection with each other. From paleogeographical analysis,
Swertia plants dispersed to Madagascar before the Late Cretaceous, to SE. Asian Islands in
the Pleistocene, to North America in the Miocene. The distribution of Swertia in Madagascar might be later than that in Asia. Therefore the origin time of the genus Swertia was at
least not later than the Late Cretaceous, and might be back to the Mid-Cretaceous.
The genus Swertia first fully developed and differentiated, forming some taxa at different evolutionary stages (Rugosa, Swertia, Poephila, Ophelia and Platynema etc. ) in the original area, and these taxa quickly dispersed in certain directions during the Late Cretaceous-Middle Tertiary when the global climate was warm and no much change. There seem
to be three main dispersal routes from the origin area to different continents; (1) The westward route i. e. from SW. China, along the Himalayas area to Kashmir, Pakistan,
Afghanistan and Iran, and then southwestwards into Africa throuth Arabia. Four sections
(Poephila, Macranthos, Kingdon-Wardia and Ophelia) took this dispersal route. Most
species of sect. Ophelia dispersed along this route, but a few along southern route and north
ern route. Sect. Ophelia greatly differentiated in Africa and the African endemic sectionSect. Montana was derived from it. The two sections form there a second distribution center
of Swertia. (2) The southward route, i. e. towards S. India through the Himalayas, and
towards SE. Asian islands through C. and S. China, Indo-China. Along this dispersal route
sect. Platynema, Sect. Spinosisemina and a few species of Sect. Ophelia dispersed; (3) The
northward rout, i. e. northwards across N. China, C. Asia to a high latitude of Euasia,
and also through E. Asia into N. America. The following groups took this route: sect. Rugosa, sect. Swertia, sect. Frasera, sect. Heteranthos and sect. Ophelia ser. Dichotomae.
Therefore, it seems that the genus Swertia originated in SW. China and then dispersed
from there to N. and S. Asia, Africa, Europe and North America and formed the moderndistribution pattern of this genus. 相似文献
994.
采用原代培养和传代培养法, 对1头毛冠鹿的胚肺组织细胞进行观察,发现一种新的核型,其二倍体染色体数目为2n=48,核型公式为2M+2ST+42T+XX,出现1对大的末端着丝粒染色体,C-带显示该染色体与已报道的相关染色体同源,首次提出毛冠鹿B染色体多态,对其传递机制进行了探讨。
Abstract: Primary culture and subculture were adopted using lung cells of a female Elaphodus cephalophus' embryo. A new karyotype and a pair of big telocentric chromosomes were found. The diploid has 48 chromosomes, and the karyotype formula is 2M+2ST+42T+XX. C-banding analysis shows that these chromosomes are homologous with those reported relevant chromosomes. This article is the first to report the polymorphism of Elophodus cephalophus B-chromosomes and studies it's transmitted mechanism. 相似文献
995.
H. C. Gerhardt J. Schul 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》1999,185(1):33-40
The selectivity of female phonotactic responses to synthetic advertisement calls was tested in choice situations. Preferences
based on differences in the linear rise-time of synthetic pulses depended on intensity and carrier frequency. When the carrier
frequency was 1.1 kHz, simulating the low-frequency peak in the advertisement call, females preferred alternatives with slower
rise-time pulses that differed by 5 ms at playback levels of 75 dB SPL and higher. A rise-time difference of 10 ms was discriminated
at 65 dB SPL. When the carrier frequency was 2.2 kHz, simulating the high-frequency peak in the call, females discriminated
a 5-ms difference in rise-time only at 85 dB SPL. Females showed no preference when the difference was 10 ms at lower playback
levels. The difference in the thresholds (about 15–20 dB) for discriminating differences in rise-time at the two carrier frequencies
was greater than the difference in behavioral thresholds for these two frequencies (about 10 dB). This result suggests that
rise-time discrimination can be mediated solely by the neural channel mainly tuned to the low-frequency peak in the call.
Females probably assess differences in rise-time by comparing the first few pulses of each call rather than by averaging over
the entire call.
Accepted: 30 March 1999 相似文献
996.
997.
998.
小鼠卵母细胞体外成熟、体外受精的效果观察 总被引:2,自引:0,他引:2
目的 研究不同培养条件对小鼠卵母细胞体外成熟及体外受精率的影响。方法 小鼠卵母细胞分别在含有FSH、BSA和胰岛素的培养液中体外成熟,在Whitten 氏液中体外受精,比较体外成熟率、体外受精率。结果 1- 裸卵(DO) 的体外成熟率、体外受精率(81-4% ,31-0 % ) 均高于卵丘卵母细胞复合体(COC)(48-6 % ,27-1% ) 。2- 在培养液中添加FSH、胰岛素和BSA,卵母细胞的体外成熟率为77-9 % ,82-3% 、60-7% ;体外受精率为77-2 % 、72-6 % 、26-7% ;2 - 细胞率为49-2 % 、34-2 % 、10-0% 。胰岛素组的卵母细胞IVM 率最高,但IVF率、2 - 细胞率低于FSH 组。3- 添加BSA的两组的体外受精率只有26-7 % 、25-8 % ,显著低于其他组,其体外成熟率也较添加FSH 和胰岛素的组成。4- 排出第一极体(PbI) 的卵母细胞的体外受精率和2 - 细胞率(85-9 % ,22-4% ) 均高于GV期卵母细胞(71-1 % ,12-9 % ) 。结论 1- 卵丘卵母细胞(COC) 较裸卵(DO) 的体外成熟率、体外受精率都低,差异显著(P成熟< 0-01;P受精< 0-05) 。2-FSH 和胰岛素均能提高小鼠卵母细胞的体外成熟率、体外受精率。3-BSA可以降低小鼠卵母细胞体外受精率,差异极显著。4-GV 期卵母细胞的体外受精率显著低于体外培养的排出第一极体的卵母细胞(P2 - cell < 0-05,P受精<0-05) 相似文献
999.
永瓣藤的地理分布及其种群空间格局 总被引:3,自引:0,他引:3
应用Greig-Smith邻接格子取样法,研究了我国珍稀植物永瓣藤(MonimopetalunchinenseRehd),的地理分布和种群空间格局及其形成机制,分析了其克隆生长格局和生态适应对策,研究结果表明,永瓣藤的分布区域狭窄,其种群空间格局为集群型,克隆生长格避为游击式稀疏形式样式,这与其生物学特性和种群生态适应的对策密切相关。 相似文献
1000.
受精作用一直是植物生殖发育生物学研究的热点课题。近年发展尤为迅速。特别是诸如偏向受精等新概念的提出更进一步推动了对双受精作用的寻微探秘,日益显现出这一过程的精巧与复杂。但限于体内研究的局限性,对其中一些关键环节,如雌雄配子间的识别;配子融合过程中的相互作用;雄核在雌性细胞内迁移的动力学及雌雄核融合的时间进程与机制等仍知之甚少。离体受精操作及相关技术的建立[1~3]为探讨上述问题提供了新途径。我们在过去工作的基础上以烟草为材料进行了离体双受精研究,以视频增差显微观察系统首次记录到在生活状态下精核进… 相似文献