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Search Results: 1 - 10 of 90475 matches for " CHEN Jia-Kuan "
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Quantitative Estimates of Outcrossing Rates in Natural Populations of Sagittaria trifolia Linn.
野慈姑自然群体异交率的定量估测 Quantitative Estimates of Outcrossing Rates in Natural Populations of Sagittaria trifolia Linn

WANG Xiao-fan,CHEN Jia-kuan,
汪小凡
,陈家宽WANG Xiao-fan,CHEN Jia-kuan

遗传 , 2000,
Abstract: 用自然群体群样和同工酶遗传标记的方法对沼生植物慈姑(Sagittaria trifolia Linn.)及其变形长瓣慈姑「S.trifolia Linnf.flongiloba(Turcz.)Makino」的异交率作了定量研究,3个自然群体的异交率估计值为t=91.0%-98.0%,表明该种为异交占绝对优势的交配系统。在野慈姑各群体间未发现异交率的显差异。
The impact of urban planning on land use and land cover in Pudong of Shanghai, China
ZHAO Bin,Nobukazu Nakagoshi,CHEN Jia-Kuan,KONG Ling-yi,
ZHAO Bin
,Nobukazu Nakagoshi,CHEN Jia-kuan,KONG Ling-yi

环境科学学报(英文版) , 2003,
Abstract: Functional zones in cities constitute the most conspicuous components of newly developed urban area, and have been a hot spot for domestic and foreign investors in China, which not only show the expanse of urban space accompanied by the shifts both in landscape (from rural to urban) and land use (from less extensive to extensive), but also display the transformation of regional ecological functions. By using the theories and methods of landscape ecology, the structure of landscape and landscape ecological planning can be analyzed and evaluated for studying the urban functional zones' layout. In 1990, the Central Government of China declared to develop and open up Pudong New Area so as to promote economic development in Shanghai. Benefited from the advantages of Shanghai's location and economy, the government of Pudong New Area has successively built up 7 different functional zones over the past decade according to their functions and strategic goals. Based on the multi-spectral satellite imageries taken in 1990, 1997 and 2000, a landscape ecology analysis was carried out for Pudong New Area of Shanghai, supported by GIS technology. Green space (including croplands) and built-up area are the major factors considered in developing urban landscape. This paper was mainly concerned with the different spatial patterns and dynamic of green space, built-up areas and new buildings in different functional zones, influenced by different functional layouts and development strategies. The rapid urbanization in Pudong New Area resulted in a more homogeneous landscape. Agricultural landscape and suburban landscape were gradually replaced by urban landscape as the degree of urbanization increased. As consequence of urbanization in Pudong, not only built-up patches, but also newly-built patches and green patches merged into one large patch, which should be attributed to the construction policy of extensive green space as the urban development process in Pudong New Area. The shape of green area of 7 functional zones became more and more regular because of the horticultural needs in Shanghai urban planning. Some suggestions were finally made for the study of future urban planning and layout.
ON SAGITTARIA TENGTSUNGENSIS (ALISMATACEAE),A SPECIES ENDEMIC TO CHINA
国产泽泻科植物特有种—腾冲慈姑

Wang Qing-feng Chen Jia-kuan,
王青峰
,陈家宽

植物分类学报 , 1996,
Abstract: 本文通过对腾冲慈姑Sagittaria tengtsungensis 模式产地的考察,并在查阅了所有馆藏标本的基础上对腾冲慈姑的形态描述进行了修订。有关形态特征的比较以及不同的地理分布区等研究结果均支持腾冲慈姑和小慈姑为两个中国特有种的观点。
MICROMORPHOLOGICAL CHARACTERS OF SEED COATS OF CHINESE HYDROCHARITACEAE AND THEIR SYSTEMATIC SIGNIFICANCE
中国水鳖科植物种皮微形态特征及其系统学意义

Sun Kun Wang Qing-feng Chen Jia-kuan,
孙坤
,王青锋

植物分类学报 , 1997,
Abstract: The importance of characters of seed coat for taxonomic and systematic research has begun to be appreciated in studies on the subclass Alismatidae recently. The present study examined micromorphological characters of seed coat of six genera, including 13 species, in the Hydrocharitaceae from China under scanning electron microscope. The characters are described and three types of seed coat are distinguished here according to cell shape of exotesta and endotegmen, sculpture of seed surface and endotegmen tuberculae: (1) Ot-telia type, of which the seed coat sculpture is absent, ridged or pilose, cell of endotegmen is polygonal to nearly oblong, and tuberculae sparsely are granulate (e.g. Ottelia Pers. ) ; (2) Hydrocharis type, of which the seed coat sculpture is verrucate, cell of endotegmen is irregular, and tuberculae densely are baculate (e.g. Hydrocharis L.); (3) Vallisneria type, of which the seed coat sculpture is verrucate, cell of endotegmen is oblong or nearly oblong, and tuberculae densely are tuberculate (e.g. Vallisneria L., Blyxa Thou et Rich., Nechaman-dra Planch., Hydrilla Rich. ) . There are some differences between genera as well as species in characters such as cell shape of seed coat, sculpture of seed surface and endotegmen tuberculae, and these characters can be served as diagnostic ones for distinguishing tribes, genera and even species in this family. Micromorphology of seed coats supports Hutchinson's (1959) and Eckhardt's (1964) treatments about the tribes Ottelieae and Hydrochariteae. Vallisneria L., Blyxa Thou et Rich., and Nechamandra Planch, should be placed in the same tribe, and the genus Hydrilla Rich, is closely related to them. In addition, the similarity of verrucae on the seed surface as well as endotegmen tuberculae between the Hydrocharitaceae and Najadaceae may indicate that the two families are closely related.
FLORAL ORGANOGENESIS OF CALDESIA PARNASSIFOLIA (BASSI EX L.) PARL. (ALISMATACEAE)
泽苔草的花器官发生

Wang Qing-feng Chen Jia-kuan,
王青锋
,陈家宽

植物分类学报 , 1997,
Abstract: The floral organogenesis of Caldesia parnassifolia (Bassi ex L.) Parl. was observed under scanning electron microscope (SEM). The primordia of the floral appendage initiated in trimerous pattern and acropetal succession. Three sepal primordia first initiated on radii spirally, and a whorl of three alternisepalous petal primordia formed nearly simultaneously after the inception of sepal primordia. The petal and stamen primordia initiated separately, and no petal-stamen complex was observed. The three anti-sepalous outer stamens arised after the initiation of petals, the other three inner (anti-petalous) stamens arised subsequently, and the six stamens were arranged in one whorl at subsequent stages of development, but still anti-sepalous and anti-petalous separately. The first whorl of 3 pistil (carpel) primordia originated opposite the sepal primordia, while subsequent pistil primordia formed rapidly in alternation with the preceeding ones, each whorl with 1~3 pistils. The significance of the spiral, acropetal development of corolla is discussed.
MICROMORPHOLOGICAL CHARACTERS OF SEED COATS OF CHINESE NAJADACEAE AND THEIR SYSTEMATIC SIGNIFICANCE
中国茨藻科植物种皮微形态特征及其系统学意义

Sun Kun Wang Qing-feng Chen Jia-kuan,
孙坤
,王青锋

植物分类学报 , 1997,
Abstract: ; The Najadaceae is one of families of the subclass Alismatidae. Although the systematic value of characters of seed coats has been appreciated in this family, further micro-morphological study of seed coats is still essential to Chinese species. The present authors examined the micromorphological characters of seed coats of the Najadaceae from China using scanning electron microscope. The details about micromorphological characters of seed coats of six species are given here. The results show that the external tangential walls of exotesta are covered with filamentous stripes or dense verrucae. The latter only exist in Najas an-cistrocarpa and N. graminea . The cell of endotegmen is usually narrowly oblong, and en-dotegmen tuberculae on the internal tangential walls are found in all the six species studied, which is identical with the report of Shaffer-Fehre (1991a) for other species in this family. These characters are useful for taxonomic research at specific level. It is found for the first time that just like endotegmen tubercula, the sculpture patterns on the surface of seed coat, such as filamentous stripes and verrucae, are similar to those of the Hydrocharitaceae, indicating that they have important value for systematics of the Najadaceae. The evidence from seed coat supports the viewpoint of Miki(1937) and Shaffer-Fehre (1991b) that the Najadaceae is closly related to the Hydrocharitaceae and should not be treated under the order Potamogetonales.
Micromorphological Study of Fruit Coats of Hydrocharitaceae from China
中国水鳖科(Hydrocharitaceae)植物的果皮微形态特征

SUN Kun,CHEN Jia-Kuan,
孙坤
,陈家宽

植物学报 , 1998,
Abstract: The micromorphological characters of fruit coats of Hydrocharitaceae from China were examined under SEM. The result indicated that sculpture of fruit surface, shape of epidermal cells and characters of radical cell wall were taxonomically useful for the identification of genera and division of some tribes. Micromophological evidence from fruit coast indicated that Hydrocharitaceae and Alismatlaes were systematically related.
Floral Organogenesis of Caldesia parnassifolia (Bassi ex L.) Parl. (Alismataceae)
泽苔草的花器官发生

Wang Qing-feng,Chen Jia-kuan,
王青锋
,陈家宽

中国科学院研究生院学报 , 1997,
Abstract: 本文用扫描电镜观察了泽苔草的花器官发生过程,观察结果表明:花萼以螺旋状方式向心发生,花瓣以接近轮状方式近同时发生,不存在花瓣雄蕊复合原基。雄蕊和心皮均以轮状向心方式发生,6枚雄蕊分两轮分别在对萼和对瓣的位置先后发生,至发育的后期排成一轮,但仍分别处于对萼和对瓣的位置;随后发生的第一轮3个心皮原基与3枚萼片相对,第二、三轮心皮原基分别为1~3个,与前一轮心皮相间排列向心发生。本文首次揭示了泽苔草花被的外轮3个萼片螺旋状发生方式,这种螺旋状方式很可能是泽泻科植物的花部结构在进化过程中适应环境而保留下来的一种较原始的叶性特征。
On Sagittaria tengtsungensis (Alismataceae), a Species Endemic to China
国产泽泻科植物特有种——腾冲慈姑

Wang Qing-feng,Chen Jia-kuan,
王青锋
,陈家宽

中国科学院研究生院学报 , 1996,
Abstract:
Progress in Studies on Floral Development of Angiosperms and Some Consideration on Future Studies
被子植物系统学中花发育研究的进展及对今后研究的思考

SUN Kun,CHEN Jia-Kuan,CHEN Zhi-Duan,
孙坤
,陈家宽,陈之端

中国科学院研究生院学报 , 1998,
Abstract: With the advent of new methods and techniques, floral development has been ex- tensively studied in many groups of angiosperms recently. These studies have resulted in notable progress and greatly increased our knowledge about the diversity of floral structure and developmental patterns as well as phylogenetic relationship of angiosperms. This field is be- coming an active and exciting one in systematics of flowering plants. The present paper re- viewed this progress from four aspects: (1) the methods of studies on floral development; (2) floral development and the diversity of floral structure; (3) floral development and phy- logeny of angiosperms; (4) molecular genetics of floral development. In addition, several fu- ture directions and some problems needing attention in this field are discussed: (1) extensive studies on floral developmental studies of extensive species of angiosperms and comparison of floral structures among them; (2) research of floral development of homeotic flowers as well as their systematic and evolutionary value; (3) floral structure should be studied from the viewpoint of dynamics, because the structure of plants can be seen as a spatio-temporal pro- cess, and the use of structural categories in systematics may distort the natural dynamics.
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