中国杜鹃花科的(纟戾)木亚科白珠树亚科北极果亚科地理分布及其与其他地区的关系

<正> 杜鹃花科(Ericaceae)为中国植物的第七大科。因此,它在中国植物地理是中国植物区系上都占有比较重要的地位。杜鹃花科共分五个亚科:杜鹃花亚科、綟木亚科,白珠树亚科、北极果亚科和乌饭树亚科。綟木亚科、白珠树亚科和北极果亚科,虽然在本科中其种类不算太多,但所含10个属,故其多样性在本科中是首屈一指的。无疑,对这三个亚科在中国的地理分布及其与其他地区的关系的讨论是有意义的。     

ULTRASTRUCTURE OF THE SHOOT APEX OF CHENOPODIUM ALBUM AND CERTAIN OTHER SEED PLANTS

The ultrastructure of cells of the vegetative shoot apices is described for Chenopodium album, Kalanchoë blossfeldiana and K. laxiflora, Bryophyllum daigremontianum, Nicotiana rustica, and N. tabacum (Maryland Mammoth), and Ginkgo biloba. A less intensive study was made of the last three listed. The structures and organelles usually associated with meristematic cells were observed: dictyosomes, plastids (in various stages of development), mitochondria, endoplasmic reticulum (ER), vacuoles, lipid droplets, and plasmalemma. In addition, spherosome-like structures were observed in all zones of the shoot apices. Also, multivesicular bodies were observed in C. album and B. daigremontianum. Ribosome density is greater in cells of the flank meristem. Proplastids, plastids with prolamellar bodies, or grana have a differential distribution in the apex, characteristic for a particular species. Confirmation could not be given to the concept that vacuoles arise as a series of local dilations in long extensions of the so called "smooth ER." The tonoplast and ER are distinguishable at the time of inception of a vacuole, although the tonoplast may arise from the ER. Rapid growth of a vacuole and/or fusion with other vacuoles may result in irregularly shaped prevacuoles. No vacuoles were observed to originate from cisternae of dictyosomes in the species studied.     

APPLICABILITY OF THE HYPERGEOMETRIC PHENOTYPIC MODEL TO HAPLOID AND DIPLOID POPULATIONS

We show that the phenotypic hypergeometric model of a quantitative trait can exactly describe both haploid and diploid populations. The condition necessary for this is equiprobability of genotypes within each phenotype. This requires equal allele frequencies across the loci, which may be the case when the population is under disruptive selection.     

98种园林植物对氯气的反应和抗性的研究

应用动式熏气装置,研究了Cl_2对98种植物的急性伤害症状及其抗性。试验的Cl_2浓度为0.2、0.3、0.5、1、2、4、7、8ppm 8个等级。Cl_2伤害的特征症状是先在叶下表面出现微小的针点状,斑点状伤斑。死、活组织间无明显界线。试验植物对Cl_2的抗性分为4级:敏感(阈值≤0.3ppm×4小时),较敏感(阈值>0.3,≤0.5ppm×4小时),较强(阈值>0.5,≤1ppm×4小时),强(阈值>1ppm×4小时)。 本试验的结果与作者以前在工厂栽培试验的结果相比较认为,以急性伤害阈值来评定植物的抗性,对大多数是适用的,此方法有应用价值。植物伤害的典型症状,可作为大气中Cl_2污染的植物指示。     

小麦等植物幼苗的生物电磁场对人体免疫淋巴细胞数量的影响

俄藉华人医学博士姜堪政 ,曾于早年提出 ,一切生物体在其生命过程中发射电磁波 ,即电磁场 ,或称生物场。该生物场载有该生物体生命活动的信息 ,能向生物体外传播 ,并能使该生物场所及范围内的其他生物体受其影响发生形态及功能上的变化。后来证明这种生物电磁波的频谱在微波波段。随后 ,姜堪政博士在俄罗斯又发明了接收、反射、传递生物微波的装置 ,称为场导舱 ;并应用其场导舱使人接受载有信息的植物幼苗发射的生物电磁波 ,成功地获得了使人体向着年青化方向变化的效应。本文报道在中国湖南省益阳国际场导中心利用姜氏场导舱使人体接受小麦…