1991, 11(4).
Abstract:The effects of mineral nutrition on net photosynthesis rate, conduc-tance of leaves, dry matter production and water consumption of springwheat under different soil moisture conditions were studied. Photosynthesis, dry matter production, water consumption
Li ying , Chen Peiyuan , Chen Jianjun ,
1991, 11(4).
Abstract:Three ecotypes of winter wheat (2 dryland types and 1 irrigated ty-pe)with different nitrogen nutrient and water supplied levels had beenstudied in pot experiment during 1987-1988. The results indicated that,as the water stress developted slowly in wheat
Liu Xijun , Wang Shuyan , Zhou Pizhen , Liu Qinglin , Li Lianmei ,
1991, 11(4).
Abstract:According to the hot and drougt climate in summer in Xi'an, thehot, drought resistance and cultivation technique of some newly intro-duced ornamental plants were studied by field cultivation and stressphysiological parameter such as leaf water condition,
Wu Yuhu ,
1991, 11(4).
Abstract:喀喇昆仑山—西昆仑山地区位于我国西部边疆,约占北纬33°—39°、东经74°—83°,是青藏高原西北隅及北部边缘的高山、高原区。本区的十字花科植物就目前所知有30属66种。从垂直分布的情况来看,大多数种都分在高山地带。其中海拔4000—5000m的高山荒漠地带有32种,占本区总属数的49%;海拔4800—5600m以上的冰缘湿地何12种,占18%;海拔2600—4000m的山地荒漠地带有15种,占23%;海拔2600—3800m的针叶林下及林缘草地有8种,占12%。表明本区十字花科值物是以寒旱生的高山、高原分布类型为主,而以中低海拔及荒漠旱生类型为次。水平分布方面,本区西部分布有49种,并以中亚成分为主;而东部和南部有28种,其中青藏高原成分较多,从属的分布区类型来看,本区的十字花科植物全都是温带性质的。其中,北温带分布类型占总属数(世界分布不计算在内,下同)的28%;其次是地中海、西亚至中亚和中亚分布类型各占21%;而东亚分布类型(全都是中国—喜马拉雅亚型)占10%。本区十字花科植物的区系特点如下:1.种类贫乏,分布广泛;2.特有种炎缺乏;3.地理成分混杂;4.同周围区系联系广泛,但同西藏区系的关系最为密切。
Wang Xinyu , Nie Xiuwan , Zheng Guochang ,
1991, 11(4).
Abstract:The microsporocytes, being in early prophase of meiosis I, of rye(Secale cereal L.) were isolated out of their anther sacs as a filament,cultured in a microchamber and observated directly under the micros-cope. In this condition that the microsporocytes
1991, 11(4).
Abstract:Relationship between the chloroplast senescence in rape leaves(Brassica napus L.) and waterlogging was studied by transmissionelectron microscopy. This study shows that the chloroplast senesce-nce is accelerated with the development of the extension of wa
Hao Lin , Xi Ti , Li Xianyang , Li Yuanying ,
1991, 11(4).
Abstract:The somatic clone was established in tissue cultures of young leafof Arena nuda. Plantlets were produced by embryogenesis or organoge-nesis. The developed pathway of callus may be altered by adjustinghormonal concentrations in media. After subcultures for
1991, 11(4).
Abstract:The ovule of Phaseolus vulgaris L. is studied with histological andhistochemical methods. There are many starch grains in the embryosac, nucellus and the integument. Wall ingrowths of the transfer celltype occurred at the micropylar and chalazal end of th
