Abstract:Determinate changes of ATPase activities in certain combinations of maize hybrid and perential inbred embryos on the 1st, 3rd, 7th and 10th days to explore biochemical mechanism expressed by heterosis. The results obtained show that ATPase activities in h

Abstract:Callus originated from the tender stem of Aseparagus officinalis seedling which were placed on MS medium with lmg/L NAA and 0.5mg/L BA. The long subculture at this condition was permissible. When the subcultured callus werc transfered to MS medium with 2m

Abstract:春小麦分别用0、1‰、3‰、5‰浓度的CaCl_2溶液浸种及培养,9天后,用0.3—0.7ppm浓度的臭氧(O_3)对幼苗熏气0、4、8、12h,观测到来经Ca~(2+)处理材料的叶片,其外渗液紫外吸收值和电导率随O_3处理时间延长都有不同程度的升高,而叶内可溶性糖和叶绿素含量都明显降低,经过3‰Ca~(2+)处理O_3熏气4—12h的材料,其外渗液紫外吸值、电导率、外渗糖、蒸腾强度都低于对照,其叶内可溶性糖及叶绿素含量均高于对照,证收明在一定O_3浓度范围内,3‰CaCl_2对O_3侵害小麦有明显的防护作用。

Abstract:Effects of exogenous Ca~(2+) on content of chlorophylls and proteins during the senescence of detached spinach leaves were studied: at the same time, the relation between accumulate of exogenous Ca~(2+) in the detached leaves and light treatment was analy

Abstract:A comparative study of microsporogenesis in fertile and male sterile millet was conduct by using various mici'oscopic techniques. Gytological observation revealed that the abortion of Shipao's microspores occured with varied types and different stages. Mi

Abstract:The lower epidermis (far-axial surface )of Davidia involucrata Baill. and thaf of its variant, Davidia invotucrata Baill. var. vilmoriniana(Dode)Wanger have a significant difference. The lower epidermis of the former species was densely covered by light y

Abstract:野生种烟草(N.repanda)具有抗栽培烟草的大多数病害,有人曾用常规技术和胚珠培养方法使其与栽培烟草(N.tabacum)杂交,但均未取得结果。我们对普通烟草(N.tabacum)与野生种烟草(N.repanda)的试管受精进行了研究,成功地克服了其种间杂交不亲和性,获得了杂种种子、幼苗和成年植株。杂种植株具有双亲特征;花粉粒败育;根尖细胞染色体数2n=48。

Abstract:In this paper, we made a comparision between normal and vitreous plants (GossyPium hirsutum L. )in structure of leaves, apieal roots on microscopic structure and submicroscopic structure. The experiment showed that the surface of vitrified leaves were irr

Abstract:应用Eberhart的性状值回归参数b_i及S_(di)~2、Tai的结构模型参数和,Ecovalence(W)值等参数,对泡桐品种多点试验林8个无性系生长量的基因型稳定性和生长适应性进行了分析。并结合生产力对各无性系进行了综合评定。结果表明:选出的8112-3和8112-1属速生、稳定、适应性强的无性系;8112-4和7606-6属于速生但不稳定的无性系,只适宜于较好的环境条件。经聚类分析将采用的8个参数明显地归为三类,类间相互独立,可分别用于评价基因型的生产力、遗传稳定性和适应性。

Abstract:The present paper deals with the numerical classification of 80 rose species and cultivars. Roses can be classified into 9 groups through Q cluster analysis. Results obtained are conductive to the revelation of inter-relationship among these groups. It is

Abstract:The northern boundary of North China Flora Region is the bor der line between East Asia forest flora and Eurasia steppe-Asia desert flora. This paper is to make the border line of them and discuss on the principle and method of floristic regionalization.

Abstract:There are 30 species with 1 variety of Artemisia Linn. in the Loess Plateau of Northern Shaanxi, and species number is the largest in the seed plants genera of this region. The species vicarism is obvious in the various vegetation region. On the ecologica