Abstract:以居群为单位研究了桃儿七的繁殖生物学，指出桃儿七为适应分布区内生长季节短暂的环境条件，花各部分的形态在开花前一年就已开始分化，并形成一休眠芽，但大小孢子还尚未进行减数分裂。到了第二年春天气温回升之后，大小孢子方才进行减数分裂，并在减数分裂之后，植株通过茎基部的居间生长将花及叶带出地面。桃儿七在开花时先花后叶。花在露出土面的第二、三天随即开放。虽然桃儿七具有一系列适应干虫煤传粉的形态结构和生物学特征，但同时也具有许多和自花授粉有关的适应机制。桃儿七在开花习性及花部形态上常表现出多态。在自然状况下，桃儿七是一种以自花授粉为主的植物，它的有性生殖良好，每株性成熟植株平均可产生60粒左右的种子，多者可达180粒。由种子萌发长成的植株大约需要5－6年的时间方才性成熟。在一般条件下，桃儿七行有性生殖，但在环境条件良好时，也可通过根茎来进行营养繁殖。桃儿七为二倍体，12条染色体组成6个联锁群，在减数分裂时，交叉发生较少。桃儿七具有较大当前适合度，亦具有一定的进化灵活度。

Abstract:The effects of the single and combined application of DPC(N. N-dimethyl peperidinium chloride ) and KH2PO4 on the anatomical structure of the stems of cottonseedlings were studied under natural and shaded light condition (30% -40% of naturallight intensit

Abstract:In this papert the variation of pollen grains from 186 herbarium specimens ofTaraxacum in Xinjiang is classified as following:The specimen that exhibit PR,PS or PA pollen type is of sexual diploid,apomicticpolyploid or male sterile plant. There are some d

Abstract:This work deals with the structure and morphology of the cytoplastnic skeleton inthe protoplasts of onion(Allium cepa L. ) bulb flesh by using TRITC-Ph labelling andwhole mount electron microscopy after Triton X-100 selective extraction. It was foundthat

Abstract:The seed of Sagittaria guyanensis Subsp. lappula consisted of no endosperm, sothe reserve constituents were stored in the embryo itself. The different parts of the embryo contained various content of nutrient storge,starch and protein. Much more starchgra

Abstract:The effect of phosphorus on water status and photosynthesis of spring wheat werestudied under soil drought conditions. The results showed that phosphorus nutritionmarkedly improved the water status of spring wheat hold the higher leaf water potentialand r

Abstract:Physiological and biochemical characteristics were researched with standard seriesrootstocks of trifoliate orange 74-1, Purpel-flowered Ichang papeda, Rusk citrange,Yuzu, Troyer citrange, Jiangnangan mandarin, Tangerine 92 and Xiecheng yuzu. Fromwihch it

Abstract:用混和去垢剂（ＳＤＳ、ＯＧ）增溶和温和电泳方法，对野生和黄化大麦的叶绿体类囊体膜进行了色素蛋白复合体组成的分离和比较，并结合ＳＤＳ－聚丙烯酰胺凝胶电泳对类囊体膜蛋白进行了鉴定。结果表明，黄化大麦类囊体膜色素蛋白组分中，ＬＨＣ Ⅱ和ＬＨＣ Ⅰ的含量都较野生型大麦明显减少；并讨论了黄化大麦类囊体膜色素蛋白含量的减少与其光合速率降低的关系。

Abstract:对东亚七筋姑分布区内１０个产地１１号材料花粉扫描电镜观察结果表明，花粉外壁纹饰具有三种类型：１．芽孢形，即外壁密布芽孢状突起；２．拟网状芽孢形。外壁呈不规则网状，网脊由大小不等的小芽孢相互融合或连接而成；３．具穿孔芽孢形。芽孢部分连接或融合，并有穿孔形成。这三种类型在陕西南部－喜马拉雅地区均有分布，而第１种类型则主要分布在秦岭－东亚东北部。花粉外壁纹饰的多样性显示该种目前正处于强烈的分化阶段，但反

Abstract:This paper deals with dynamic changes of the generative cell and the vegetative nucleus in the artifficially germinated pollen tube of Liriope spicata Lour. with the use ofDNA specific fluochrome 4', 6-diamidino-2-phenylindole (DAPI). In many pollen tubes

Abstract:The effects of LN2 injury in apricot seeds divided roughly into three categories. Thevigour embryoes, through whole cotyledons were damaged, could grow a letplant cultured in vitro. apricot seeds with damaged partly cotyledons germinated 3- 4 days lateand

Abstract:报道了国产有鳞杜鹃５７个种的叶背鳞片显微形态特征；比较了髯花杜鹃组与杜鹃组中２２个亚组叶背鳞片的显微形态特征；依据鳞片脐的直径与边缘宽度比，边缘形态及其他特征，可分为五大类型；圆鳞片、大脐鳞片、小脐鳞片、放射状鳞片、红色厚鳞片，其中前三个还可分为１０个小型。讨论了鳞片演化的趋势：（１）小圆鳞片是最原始的，小脐深裂鳞片是最进步的；（２）脐演化方向是大→小脐；（３）边缘演化方向是无边缘→有边缘、全缘→

Abstract:In this paper the nutlet surfaces ornamentation of 2 species of Lipocarpha R. Br. 3species of Bulbostylis C. B. Clarke and 2 species of Fuirena Rottb. in China were examined under SEM for the first time. The results indicate that the ftuit coat sculptures

Abstract:The studies on epidermal fertures of leaves in 9 species belong to Sect. Populus wasconducted with LM and scanning electron microscopy. The stomatal apparatus is anomocytic typb,distributing on the abaxial surface of the leaves and the range of their size

Abstract:The steppe of Bothriochloa ischaemum in Loess Plateau are the characters of thezone. It is result that this subtropical steppe in Loess Plateau were moved from Eurasianinland to periphey along with the intenifying drought and the changing cold of the clim

Abstract:Quantitative comparison and analysis on seed flora in northwestern China,includingAlashan, Ali l the west of Yellow River, Aerjin Mountian, Altai Mountain, ZhungeerBasin,Tarim Basin,Tsaidam Basin,and Tianshan Mountain has made. The results indi-cated that

Abstract:In this paper,it is comparatively studied that the coniferous forests in Taibai Mountains are numerically classed by fuzzy clustering analysis and maximal tree method offuzzy graph theory. 26 plots sampled in Taibai Mountains are divided into 7 groups. Th

Abstract:The effects of fators on protoplast isolation from pepper (Capst 'um annuum L.)were studied. The results showed that the protoplasts with higher yield and viabilitywere isolated from young cotyledons. The important effects of osmoticum,enzyme concentratio

Abstract:This experiment has solved basically some key problems of the technology of multipropagation of kiwifruit- The suitable medium components of the distinct stage (mg/L):the medium of the propagation; MS + 6-BAO. 5 +IAAO. 1,numbers of yong shoot produced fro

Abstract:WRR brought about transform starch into soluble sugar in germination of riceseeds. There was no variance among concentrations of WRR for promotion of the starchtransform. WRR enhanced respiratory intensity of the seeds,and there was variance among WRR con

Abstract:The sarcocarp cell,the cell wall composition,the subcellular structure and the intercellular changes during fruit ripening period are comprehensively discussed in this paperbased on an electron microscope observation of the sarcocarp tissue change state d