黑麦 (Secale L .)是丰富小麦 (Triticum aestivum L .)遗传变异、选育小麦优良新品种的重要基因资源。迄今黑麦属在系统分类学、细胞遗传学、分子遗传学和小麦育种中的利用等方面的研究均已取得了令人瞩目的进展。本文主要从以上四个层...黑麦 (Secale L .)是丰富小麦 (Triticum aestivum L .)遗传变异、选育小麦优良新品种的重要基因资源。迄今黑麦属在系统分类学、细胞遗传学、分子遗传学和小麦育种中的利用等方面的研究均已取得了令人瞩目的进展。本文主要从以上四个层次 ,概述了黑麦属在分类、分布、核型带型分析、黑麦染色质的鉴定、重复序列研究、遗传图谱构建和利用黑麦改良小麦的育种实践等几个方面的最新进展。同时 ,对当前如何深入开拓和利用黑麦属基因资源进行了讨论。展开更多
In this study, we survey the plant diversity of Wadi Hassan, which is located in the Northeastern Badia of Jordan, about 120 km east of Amman. All plant species were collected and herbarium specimens have been prepare...In this study, we survey the plant diversity of Wadi Hassan, which is located in the Northeastern Badia of Jordan, about 120 km east of Amman. All plant species were collected and herbarium specimens have been prepared, identified and deposited at the University of Jordan herbarium(Department of Biology,Faculty of Science). The final plant checklist includes 206 species belonging to 138 genera and 35 families.The most diverse families are Compositae(20.5%), Cruciferae(10.2%), Leguminosae(8.3%) and Boraginaceae(6.8%), followed by Caryophyllaceae and Gramineae(5.4%). These six families represent 60% of the total families recognized in the study area, while nine families each are represented by only one species. Most plants recorded are annual plants(61%), some plants are hemicryptophtes(18%) and camaephytes(15%), while the least frequent life form class was the phanerophyte shrub and perennial(0.5%). Chorological characteristics of the recorded flora show that Saharo-Arabian Region elements, IranoTuranian elements and Mediterranean elements constitute(58%) of the total flora. This research shows that even small portion of the Jordan Badia such as the Wadi Hassan plant community has high species diversity. Thus, we recommended further of the unexplored Wadi plants communities of the Jordan Badia.展开更多
A phytosociological study of a weed community dominated by Hydrocotyle mannii and Centella asiatica was carried out in Kampala, the capital city of Uganda from 2000 to 2002. The Zurich-Montpellier School of Phytosocio...A phytosociological study of a weed community dominated by Hydrocotyle mannii and Centella asiatica was carried out in Kampala, the capital city of Uganda from 2000 to 2002. The Zurich-Montpellier School of Phytosociology method was used with special emphasis on floristic and synecological structure as well as on dynamic aspects. This community was found to grow on shady moist roadsides and is about 15 cm high. In total, 54 species were recorded; most of them are annual, anemochorous and widespread. The Hydrocotyle mannii and Centella asiatica community is described as a new weed association： Hydocotylo-Centelletum asiaticae Mosango ass. nova.. Hydrocotyle mannii, Centella asiatica, Dichondra repens and Sida veronicifolia have been recognized as the character species of this association. The Hydrocotylo-Centelletum is a pioneer association. It has been ascribed to the alliance Eleusinion indicae Leonard 1950 which includes plant communities growing on shady roadsides. In terms of ecological succession, it appears to be evolving to the Asystasia gangetica herbaceous fallow association which belongs to the alliance Panicion maximi. It belongs to the order Ruderali-Euphorbietalia Schmitz 1971 and the class Ruderali-Manihotetea Leonard in Taton 1949.展开更多
Ohud mountain is one of the main important historic sites in the Arab Peninsula,and it is distinguishable over the rest of the mountains in the region.No extensive floristic survey has been carried out on Ohud mountai...Ohud mountain is one of the main important historic sites in the Arab Peninsula,and it is distinguishable over the rest of the mountains in the region.No extensive floristic survey has been carried out on Ohud mountain because of the rugged topography of this mountain.The current study investigates the floristic diversity and the correspondence of environmental factors of the phytogeographical distribution of plants,based on the floristic analysis of the present region.The research question is about the relationships between the species diversity and the human impacts of populated area at lowlands around Ohud mountain.A total of 59 species belonging to 56 genera and 28 families were recorded.Asteraceae had the highest contribution,about 12%of the total plant species.The analysis of the life forms demonstrated the prevalence of therophytes(68%)followed by chamaephytes(24%),indicating the adaptation of these life forms to hyperarid conditions.The chorological analysis indicated the predominance of the bi-regional taxa over the other phytochoria.Most of the recorded plant species belong to Saharo-Arabian and Sudano-Zambezian(24%)phytochoria.TWINSPAN analysis was performed to detect the indicator species of different vegetation groups and confirmed by detrended correspondence analysis(DCA or DECORANA).It is concluded that species richness and diversity revealed clear variation along the mountain and among the studied sites.Plant species diversity and richness were more pronounced in the intermediate portion of the elevation gradients across the mountain,with a decrease in the high altitudinal belts.The decrease was also recorded at the lower altitudes,where human impacts clearly affected vegetation;leading to a decrease in alpha diversity.In addition,the beta diversity among moderately highlands and lowlands was considerably high indicating the heterogeneous species composition among the studied sites along mountain elevations.The general pattern of vegetation groups distribution is controlled by a number of environm展开更多
Objective： To investigate the pathological features and chronological changes of 1003 cases with gastric cancer in Zhuanghe high-risk area during 1992-2005 and the relationship between the changes and etiology factor...Objective： To investigate the pathological features and chronological changes of 1003 cases with gastric cancer in Zhuanghe high-risk area during 1992-2005 and the relationship between the changes and etiology factors in order to make a clue for gastric cancer prevention. Methods： A total of 1003 gastric cancer specimens resected surgically between 1992-2005 in Zhuanghe Center Hospital were studied. The specimens were fixed in formalin and diagnosed by routine pathology. Results： The incidence of patients with gastric cancer was highest at age of 60-69, the next high was at age of 50-59 and it was significantly higher in male than in female （P〈0.001）, the ratio was 3.0：1. During the past 14 years, there were 159 （15.9%） EGC, 195 （19.4%） moderate and 649 （64.7%） advanced gastric cancer detected. In macroscopical features, type Ⅲ remained dominant in EGC, the next was mixed type in EGC. In advanced gastric cancer the Borrmann＇s type Ⅲ remained the dominant, the next was type Ⅱ. For nodal metastasis, positive cases were decreasing and negative were increasing in EGC, moreover negative cases were higher than positive ones each year. There was no obvious trend in advanced cancer but positive cases were higher than negative ones each year. In histological features, papillary, moderately and poorly differentiated tubular adenocarcinoma remained downtrend, mucus adenocarcinoma and undifferentiation cancer remained uptrend year after year. The radio of intestinal to diffuse type decreased from 0.78 to 0.62 during the past 14 years. Conclusion： There were significant chorological trends of pathological characteristic of gastric cancer in Zhuanghe high-risk area during the past 14 years.展开更多
文摘黑麦 (Secale L .)是丰富小麦 (Triticum aestivum L .)遗传变异、选育小麦优良新品种的重要基因资源。迄今黑麦属在系统分类学、细胞遗传学、分子遗传学和小麦育种中的利用等方面的研究均已取得了令人瞩目的进展。本文主要从以上四个层次 ,概述了黑麦属在分类、分布、核型带型分析、黑麦染色质的鉴定、重复序列研究、遗传图谱构建和利用黑麦改良小麦的育种实践等几个方面的最新进展。同时 ,对当前如何深入开拓和利用黑麦属基因资源进行了讨论。
基金supported by the Biology Department, University of Jordan, AmmanUniversity of Jordan support for Scientific Research
文摘In this study, we survey the plant diversity of Wadi Hassan, which is located in the Northeastern Badia of Jordan, about 120 km east of Amman. All plant species were collected and herbarium specimens have been prepared, identified and deposited at the University of Jordan herbarium(Department of Biology,Faculty of Science). The final plant checklist includes 206 species belonging to 138 genera and 35 families.The most diverse families are Compositae(20.5%), Cruciferae(10.2%), Leguminosae(8.3%) and Boraginaceae(6.8%), followed by Caryophyllaceae and Gramineae(5.4%). These six families represent 60% of the total families recognized in the study area, while nine families each are represented by only one species. Most plants recorded are annual plants(61%), some plants are hemicryptophtes(18%) and camaephytes(15%), while the least frequent life form class was the phanerophyte shrub and perennial(0.5%). Chorological characteristics of the recorded flora show that Saharo-Arabian Region elements, IranoTuranian elements and Mediterranean elements constitute(58%) of the total flora. This research shows that even small portion of the Jordan Badia such as the Wadi Hassan plant community has high species diversity. Thus, we recommended further of the unexplored Wadi plants communities of the Jordan Badia.
文摘A phytosociological study of a weed community dominated by Hydrocotyle mannii and Centella asiatica was carried out in Kampala, the capital city of Uganda from 2000 to 2002. The Zurich-Montpellier School of Phytosociology method was used with special emphasis on floristic and synecological structure as well as on dynamic aspects. This community was found to grow on shady moist roadsides and is about 15 cm high. In total, 54 species were recorded; most of them are annual, anemochorous and widespread. The Hydrocotyle mannii and Centella asiatica community is described as a new weed association： Hydocotylo-Centelletum asiaticae Mosango ass. nova.. Hydrocotyle mannii, Centella asiatica, Dichondra repens and Sida veronicifolia have been recognized as the character species of this association. The Hydrocotylo-Centelletum is a pioneer association. It has been ascribed to the alliance Eleusinion indicae Leonard 1950 which includes plant communities growing on shady roadsides. In terms of ecological succession, it appears to be evolving to the Asystasia gangetica herbaceous fallow association which belongs to the alliance Panicion maximi. It belongs to the order Ruderali-Euphorbietalia Schmitz 1971 and the class Ruderali-Manihotetea Leonard in Taton 1949.
文摘Ohud mountain is one of the main important historic sites in the Arab Peninsula,and it is distinguishable over the rest of the mountains in the region.No extensive floristic survey has been carried out on Ohud mountain because of the rugged topography of this mountain.The current study investigates the floristic diversity and the correspondence of environmental factors of the phytogeographical distribution of plants,based on the floristic analysis of the present region.The research question is about the relationships between the species diversity and the human impacts of populated area at lowlands around Ohud mountain.A total of 59 species belonging to 56 genera and 28 families were recorded.Asteraceae had the highest contribution,about 12%of the total plant species.The analysis of the life forms demonstrated the prevalence of therophytes(68%)followed by chamaephytes(24%),indicating the adaptation of these life forms to hyperarid conditions.The chorological analysis indicated the predominance of the bi-regional taxa over the other phytochoria.Most of the recorded plant species belong to Saharo-Arabian and Sudano-Zambezian(24%)phytochoria.TWINSPAN analysis was performed to detect the indicator species of different vegetation groups and confirmed by detrended correspondence analysis(DCA or DECORANA).It is concluded that species richness and diversity revealed clear variation along the mountain and among the studied sites.Plant species diversity and richness were more pronounced in the intermediate portion of the elevation gradients across the mountain,with a decrease in the high altitudinal belts.The decrease was also recorded at the lower altitudes,where human impacts clearly affected vegetation;leading to a decrease in alpha diversity.In addition,the beta diversity among moderately highlands and lowlands was considerably high indicating the heterogeneous species composition among the studied sites along mountain elevations.The general pattern of vegetation groups distribution is controlled by a number of environm
基金supported by the National"Tenth-Five"Key Technologies R&D Program of China(2004BA703B04-02)
文摘Objective： To investigate the pathological features and chronological changes of 1003 cases with gastric cancer in Zhuanghe high-risk area during 1992-2005 and the relationship between the changes and etiology factors in order to make a clue for gastric cancer prevention. Methods： A total of 1003 gastric cancer specimens resected surgically between 1992-2005 in Zhuanghe Center Hospital were studied. The specimens were fixed in formalin and diagnosed by routine pathology. Results： The incidence of patients with gastric cancer was highest at age of 60-69, the next high was at age of 50-59 and it was significantly higher in male than in female （P〈0.001）, the ratio was 3.0：1. During the past 14 years, there were 159 （15.9%） EGC, 195 （19.4%） moderate and 649 （64.7%） advanced gastric cancer detected. In macroscopical features, type Ⅲ remained dominant in EGC, the next was mixed type in EGC. In advanced gastric cancer the Borrmann＇s type Ⅲ remained the dominant, the next was type Ⅱ. For nodal metastasis, positive cases were decreasing and negative were increasing in EGC, moreover negative cases were higher than positive ones each year. There was no obvious trend in advanced cancer but positive cases were higher than negative ones each year. In histological features, papillary, moderately and poorly differentiated tubular adenocarcinoma remained downtrend, mucus adenocarcinoma and undifferentiation cancer remained uptrend year after year. The radio of intestinal to diffuse type decreased from 0.78 to 0.62 during the past 14 years. Conclusion： There were significant chorological trends of pathological characteristic of gastric cancer in Zhuanghe high-risk area during the past 14 years.
