Abstract:The mature fruit of mango are assumes a yellow oblong aspect.The exocarp of mangoassumes a coriaceous aspect.The mesocarp of mango asstimes a fleshy aspect.The endocarpof mango assumes a bony aspect and there are fibers on the surface,the endocarp wraps s

Abstract:The plants sampled from Xizang Plateau have been determined in this study. The back-groud values of 36 elements have been given,and compared with average content of the wholeworld plant.The preliminary results suggest that the nutrition level of plants wi

Abstract:A flower in Gentiana macrophylla has 5 stamens,the deveopment of anther walls conformsto the dicotyledonous type. Tapetum is of plasmodial type and some cells become two-layered atthe later period. Cytokinesis in the microsporocyte meiosis is simultaneou

Abstract:合子的第一次分裂为斜的横分裂，胚发育至棒状原胚后，胚顶端一侧的细胞加速分裂形成一团分生组织细胞，由这团分生组织分化盾片、胚芽鞘、胚芽生长点和胚根。胚体的其它部分参与部分盾片和胚根鞘的构成。胚柄不参与胚的组成，胚无外胚叶，胚胎发育属禾本型。核型胚乳。从胚囊壁产生的自由生长壁把胚乳游离核隔开形成一层胚乳细胞。然后这层细胞平周分裂使胚乳细胞变成二层，以后的胚乳细胞增殖以细胞有丝分裂方式进行。胚乳的最外层

Abstract:With the help of thin section and ultrathin section,the transfer of nuclei,which occurs dur- ing senescence of the scale leaf in Pinus tabulaeformis,is observed.Chromatin in nuclei is first gathered into a small sphere,then nuclei gradually came near to t

Abstract:The iris somaclones which include Iris germanica,Iris lactea var. chinensis,Iris tectorum andIris spuria were established through In Vitro culture of their flower organs. The effects of In Vit-ro culture on iris somaclonal variation were studied during s

Abstract:盐胁迫吸胀后的大麦种子转入正常条件下萌发，其发芽势严重降低，发芽率则和对照差异不大。电镜观察表明，萌发３天的大麦根尖分生区细胞膜系统已修复完善，内质网和高尔基体丰富，变形质体和变形线粒体大量出现，表明短时盐胁迫对种萌发的抑制作用是可逆的，而且一旦抑制作用被解除，植物细胞内的大生代谢活动会更加活跃，这一现象称为“抑制效应的补偿作用”。由于盐胁迫吸胀后代谢加强总伴随着变形质体和变形线粒体的大量出现。因

Abstract:The characteristics of grain quality,protein quality ,milling quality,farinograms,and ex-tensograms,as well as the baking quality of 35 mainly wheat varieties and strains, cultivated inprovince Shaanxi,have been analysed comprehensively and systematically

Abstract:以关中地区四十年代到九十年代推广种植的主要代表品种及品系为材料，对其分蘖动态、生育期、株高因素、穗部性状、产量、生物学产量、经济系数及冬春性等２０个性状进行了研究，其结果表明关中地区四十代到九十年代小麦品种性状演变的趋势是：冬、春季分蘖变化不大，冬季分蘖趋向略增；春季分蘖趋向略减；成穗数趋向降低，拨节，抽穗和开花期有趋早倾向，而成熟期和总生育天数无明显变化，株高降低极明显（１３７．７－８５．２ｃｍ

Abstract:着重应用聚类分析方法对华北地区野豌豆属进行研究，确定本属中亚属，组及种的分界限；并且把变型窄叶大龙骨野豌豆提升为种：矮野豌豆。

Abstract:Southern Shaanxi is the edge region of distribution of Pinus massoniana,the population structrure and dynamics of Pinus massoniana possess both zonality and regionalism characteristic. And it often plays a pioneer role in succession series, but the popula

Abstract:In this paper,16 clones of different seed sources were comprehensively evaluated byFuzzy mathematics through their formation,colour,smell,sickness resistance. among them,the 5 are fine edible clones.

Abstract:对产于陕西省的腹菌纲真菌，共４２个ＯＴＵ＇Ｓ和３６个性状，进行了Ｑ模式聚类分析，结果表明：（１）４２个ＯＴＵ＇Ｓ明显的分为六大类群，与Ｄｒｉｎｇ（１９７３）系统的６个目相吻合。（２）栓皮马勃属与灰包科中包被具拟薄壁层的属相似性较小，支持Ｈａｗｋｓｗｏｒｔｈｅｔａｌ（１９８３）将其作为科级处理的观点。（３）作者认为鬼笔属和竹荪属作为两个独立属处理比较合适。

Abstract:By means of the brine shrimp letality bioassay,the authors study 36 abstracts from poly-goaceae family plants Pteroxygonum giraldii Dummer et Diels,FagopyruM dibotys(D. Don )Hara, Rummer dentatus,Rumex patientia L.,Rumex dictyocarpus Bioss et Buhse,Rhe

Abstract:Lepidium latifolium L. is a wild plant.It is abundant at northwest China. It has been stud-ied on the changes of protein and 17 amino acid content in different development periods.And al-so has been studied on the 17 mineral content in different organ. T