Biosystematic Studies on Adenophora potaninii Korsh. Complex (Campanulaceae). Ⅰ. Phenotypic Plasticity

Phenotypic plasticity is the environmental modification of genotypic expression and an important means by which individual plants respond to environmental heterogeneity. The study of phenotypic plasticity in the genus Adenophora, which is very complicated taxo nomically because of great morphological variation, proves to be helpful in both investigating the phenotypic variation so as to evaluate potential taxonomic value of their characters and providing important sources of information on the variation, adaptation and evolution of the genus. Twenty-three populations representing all the six species in Adenophora potaninii complex were transplanted into the garden. Of them six populations were selected for study ing their performance in the field and in the garden, in addition to cultivation experiment under different treatments. The results show that there exists considerable developmental plasticity in some leaf, floral and capsule characters. In particular, the leaf shape and length of calyx lobe display significant developmental variation with the maximum being three times as great as the minimum, which is noteworthy because they were previously considered as diagnostic. The characters of root, caudex, stem and inflorescence are found to be very plastic, especially the root diameter, the number of stems, stem height and inflorescence length with great environmental plasticity. In addition, the populations from different habi tats show distinct amounts of plasticity. On the contrary, the characters of leaf, floral, cap sule and seed are less influenced by environments. It seems that the considerable variation in the characters of leaf is attributed mainly to genetic differences. Finally, the phenotypic plasticity of morphological characters of A. potaninii complex and its taxonomic significanceis discussed.     

加拿大B.C.省中部亚北方未成熟小杆松林生态学及高生长分析

本文研究了小杆松(PinuscontortaDougl.exLoud.)高生长与生态立地质量(ecologicalsitequality)间的关系.用生物地理气候生态系统分类(biogeoclimaticecosystemclassification)方法和数量方法分析了植被、环境和林分数据,这些数据是从在B.C.省中部具有山地北方气候以及广泛的土壤水分和养分条件的72块样地中获得的.     

Research on Bioecological Characteristics of Suaeda physophora and Its Community at the Hutubi Cattle Farm Area of Xinjiang,China

Suaeda physophora was distributed on the saline soil with a salt contents 3.0%～ 6.0% in the surface layer (0420 cm underground). The plant height was 45～60 cm and the average length of the one-year twig was 12 cm. The succulent leave was strip shaped. The well developed lateral roots was distributed in the deeper soil (EOb 60 cra) with decreased salt contents and increased water content. The multiregression model for individual plant's aboveground biomass was: Y = 312. 00 + 3.44X1 + 4. 85X2 - 2.16X3 (Xl, length; X2, width: X3, height). The contents of Na, S and K in leave of S. physophora were very high. That of Na was 91255 μg · g-1. The element contents varied in the different parts of plant. K, Na, Mg, S and P contents were the highest respectively in the leaf and ear of flower, but they were the lowest in the old twig. Total salt content of water extracts from tender twig and leaf was 23.17%, being more than in ear of flower and old twig. The element and salt contents varied in different seasons of plant growth. The S. physophora community was a formation on the succulent halophytic dwarf sub-shrub desert. Nine associations were recorded at this area. The coverage of community was 6 % ~25 %.     

福建荸荠属果皮微形态学研究

本文报道了在立体显微镜和扫描电子显微镜下对福建荸荠属8种、1变种植物果实表皮微形态特征的观察结果。根据果皮纹饰的不同,可分为两种类型:网状纹饰、拟网状纹饰;荸荠属植物果实表皮微形态特征具有丰富的多样性,表型可塑性小,不同类群之间具有明显的种间差异。观察结果表明:荸荠属果实表皮微形态特征是该属分类与系统研究中不可忽视的性状。     

大别山山核桃林植物组成与区系特征研究

大别山山核桃林植物组成与区系特征研究张旭东,黄成林（安徽农业大学,合肥２３００３６）叶志琪（合肥林业学校,合肥２３００３１）ＦｌｏｒｉｓｔｉｃｃｏｍｐｏｓｉｔｉｏｎａｎｄｉｔｓｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＣａｒｙａｃａｔｈａｙｅｎｓｉｓｆｏｒｅ...     

Variation Patterns and Systematics of the Widespread Species Epilobium angustifolium L.(Onagraceae) in China

Cytological, morphological, and geographical studies of Epilobium angustifolium in China reveal two partly distinct, partly overlapping entities that are best treated as subspecies. The diploid (n=18) subsp. angustifolium has smaller, triporate pollen grains, typically glabrous stems and leaves, and smaller leaves and flowers, and occurs in colder, more northern areas, and at higher elevations in overlap zones. The tetraploid (n=36) subsp. circumvagum has larger pollen with a mixture of quadriporate pollen grains, pubescent stems and leaves, and larger leaves and flowers, and occurs in warmer parts of southern China and at lower elevations. We report 11 chromosome counts, six diploid and five tetraploid, includingthe first reported tetraploids in Asia.     

甘肃汉族头面部特征亲子相关研究

本文对甘肃永登农村地区69个汉族家庭的父母和成年子女头面部特征进行了亲子相关研究。结果表明:头颅部指数似乎儿子受父亲母亲的影响较强,测量项目似乎女儿受父亲的影响较强;脸面部测量项目的亲子相关表现出一定程度的方向性,儿子或女儿垂直方向的尺寸(高度)似乎受父亲的影响较强,横向(宽度)似乎受母亲的影响较强,从指数上来看,母亲对子女脸面部的影响似乎比父亲强一些。     

Variation and Phylogenetic Relationships Between Polygonatum odoratum and P. cyrtonema

The present paper is a report on combined cytological and taxonomical studies of Polygonatum odoratum and P. cyrtonema. Based on the extensive field observation and mass collection for some years, the authors made a detailed comparison of the variation pattern of morphology、cytology as well as geographic distribution between forms of P. odoratum and P. cyrtonema. The results show that: Form I: Stem angular, leaves elliptic, peduncles with one, rarely two flowers, perianth 1.7-2.0 cm long, stamens adnate to perianth in the middle part or a little lower. The karyotype formula is 2n=20=12m+8sm (2SAT); Form II: Stem angular, leaves narrow-oblong, peduncles with 2-3 flowers, perianth 2.8-3.2 cm long, the position of stamens on perianth is above the middle part. It has the karyotype 2n=20=8m+1osm(4SAT)+2st; Form III: Stem terete, leaves oblong-lanceolate, peduncles with 3- 10 flowers, perianth 1.5- 2.0cmlong, stamens are adnate to perianth also above the middle part. In this form, two kinds of karyotypes are found: 2n = 22 = 6m+8sm+8st and 2n = 20 = 4m+6sm (2SAT) +10st; Form IV: Stem terete, leaves elliptic, peduncles with 1-4 flowers, perianth 2.3-2.8 cmlong, stamens adnate to perianth above the middle part. The karyotype formulae are 2n = 20 = 4m+14sm (2SAT)+2st and 2n = 20 = 10m+10sm (2SAT); Form V: Stem terete, leaves oblong-lanceolate, peduncles with 3-5 flowers, perianth less than 2.0cm long, stamens adnate to perianth above the middle part. It is of the karyotype 2n=22=4m+8sm(2SAT) +10st. It is pointed out that the P. odoratum collected from the Qinling Range may be a hybrid or an intermediate in the evolutionary process from P. odoratum to P. cyrtonema. The differences between the different forms of P. cyrtonema are obvious and stable, and are probably derived from the chromosomal variation. The different forms of P. cyrtonema may have evolvedfrom P. odoratum along different courses.     

2018年我国19株猪链球菌4型分离株的病原学特征及分析

[背景]近年来,猪链球菌4型(Streptococcus suis serotype 4,SS4)分离率逐渐上升,但是有关SS4的系统研究报道匮乏.[目的]研究19株SS4临床分离株的病原学特征.[方法]以2株猪链球菌2型(Streptococcus suis serotype 2,SS2)强毒株为参考菌株,对19株S...