A new species of the brown lacewing genus Zachobiella Banks from China (Neuroptera,Hemerobiidae) with a key to species

The genus Zachobiella Banks, 1920 is reviewed and a new species Zachobiella yunanica sp. n. described from China. All species found in China are redescribed, and Zachobiella submarginata Esben-Petersen, 1929 is recorded from China for the first time. A key to the adults of Zachobiella is provided.     

低镁胁迫对低温下黄瓜幼苗光合特性和抗氧化系统的影响

以‘津优3号’黄瓜幼苗为试材,以Hoagland全营养液处理为对照(CK),研究低镁(30％Mg)胁迫对低温(昼/夜温度12℃/8℃)下黄瓜幼苗光合特性和抗氧化系统的影响.结果表明:低温下30％Mg处理黄瓜幼苗叶片Mg含量显著低于CK,而根中Mg含量与CK差异不显著.随着低温胁迫时间的延长,黄瓜幼苗叶片的叶绿素含量、净光合速率(Pn)、气孔导度(gs)和羧化效率(CE)逐渐降低,胞间CO2浓度(Ci)趋于升高.与CK相比,低温下30％ Mg处理叶片叶绿素含量、Pn、gs和CE显著降低,C-变化不大,叶绿体膜损伤严重,叶绿体数、基粒数和片层数较少,淀粉粒数增加,淀粉粒较长,丙二醛(MDA)含量升高,而超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)和谷胱甘肽还原酶(GR)活性降低.可见,低温下镁运输受阻引起的缺镁是叶片失绿的主要原因;低温引起Pn降低的主要原因是非气孔限制,低镁胁迫会加大低温对黄瓜Pn的影响,而由此引起的Pn降低的主要原因是气孔限制.     

Genetic Diversity and Pathogenicity of Fusarium oxysporum f.sp. melonis Races from Different Areas of Italy

Fusarium wilt caused by Fusarium oxysporum f.sp. melonis (FOM) is a devastating disease of melon worldwide. Pathogenicity tests performed with F. oxysporum isolates obtained from Italian melon‐growing areas allowed to identify thirty‐four FOM isolates and the presence of all four races. The aims of this work were to examine genetic relatedness among FOM isolates by race determination and to perform phylogenetic analyses of identified FOM races including also other formae speciales of F. oxysporum of cucurbits. Results showed that FOM race 1,2 was the most numerous with a total of eighteen isolates, while six and nine isolates were identified as race 0 and 1, respectively, and just one isolate was assigned to race 2. Phylogenetic analysis was performed by random amplified polymorphic DNA (RAPD) profiling and by translation elongation factor‐1α (TEF‐1α) sequencing. The analysis of RAPD profiles separated FOM races into two distinct clades. Clade 1, which included races 0, 1 and 1,2, was further divided into ‘subclade a’ which grouped almost all race 1,2 isolates, and into ‘subclade b’ which included race 0 and 1 isolates. Clade 2 comprised only race 2 isolates. The phylogenetic analysis based on TEF‐1α separated FOM from the other formae speciales of F. oxysporum. Also with TEF‐1α analysis, FOM races 0, 1 and 1,2 isolates grouped in one single clade clearly separated from FOM race 2 isolates which grouped closer to F. oxysporum f.sp. cucumerinum. RAPD technique was more effective than TEF‐1α in differentiating FOM race 1,2 isolates from those belonging to the closely related races 0 and 1. Both phylogenetic analyses supported the close relationship between the three different FOM races which might imply the derivation from one another and the different origin of FOM race 2.     

中国南方古生代的一些海相新藻类(英文)

本文报道中国南方广西、贵州晚泥盆世-早石炭世的钙质微体古生物,描述红藻新属Yishanella及其二个新种(Yishanelle filosasp.nov.,Y.multitubalasp.nov.),一个绿藻新种(Pseudokamaenaregularissp.nov.)和一种分类位置未定化石(Menselina nanasp.nov.)。该微体植物群繁衍于透光带中。识别出三个组合,分别代表清洁水体的Girvanella,泥质的Issinella和介于二者之间的Menselina环境。     

中国东南沿海裸鞘花水母一新属及三新种记述

记述了采自中国东南沿海台湾海峡南部、福建南部东山湾和福建东部宁德三都湾裸鞘花水母1新属——拟长管水母属Dipurenella gen.nov.和3新种,即刺胞海帽水母Halitiara knides sp.nov.,东山拟长管水母Dipurenella dongshanensis sp.nov.和粗管外肋水母Ectopleura crassocanalis sp.nov.。详细描述其形态特征,并与近似种进行比较。模式标本保存于厦门大学海洋与环境学院。     

摇蚊亚科中国一新纪录属——脊突摇蚊属(双翅目:摇蚊科)

记述了摇蚊亚科中国新纪录属--脊突摇蚊属Cyphomella Seether,1977.给出了膜脊突摇蚊 C.cornea S(ae)ther,1977的详细描述、绘图以及世界脊突摇蚊属雄成虫分种检索表.标本保存于南开大学生命科学学院.     

硝态氮对黄瓜子叶谷氨酰胺合成酶和谷氨酸脱氢酶活性的影响

在硝态氮存在或缺乏的条件下,测定了黄瓜(Cucumis sativus L．)种子萌发和子叶发育过程中子叶可溶性蛋白质含量以及谷氨酰胺合成酶(GS)和谷氨酸脱氢酶(NAD(H)-GDH)活性的变化。在子叶发育初期,无论外源氮存在与否,每对子叶可溶性蛋白质含量和GS、NADH—GDH、NAD^ -GDH活性随发育上升。在外源氮存在下,第4d后,可溶性蛋白质含量虽有所下降,但基本保持恒定;第6d后,GS和NADH—GDH活性逐渐降低,NAD^ -GDH却相反增高。但在无外源氮条件下,于第4d后,可溶性蛋白质水平以及GS、NADH—GDH和NAD^ -GDH活性都逐渐降低。在子叶发育的整个过程中,外源氮对GS和NAD^ -GDH活性有促进作用,尤其是在子叶发育的后期对NAD^ -GDH活性的促进更为明显。     

中国冕蟹蛛属一新种记述(蜘蛛目,蟹蛛科)

记述了采自中国湖南省石门县壶瓶山境内的蟹蛛科形状不同,本种纳精囊细管状,而后者囊状;3)新种螯肢Thomisidae冕蟹蛛属Smodicinodes 1新种,壶瓶冕蟹蛛Smod- 前齿堤有5根须状长毛,而后者为2个小齿.雄蛛与Smodiicinodes hupingesissp nov..新种与Smodicinodes kovaci Ono,cinodes schwendingeri Benjamin,2002相似,但有以下几点不1993相似,但有以下几点不同:1)两者头胸部和腹部的比同:1)腹部形状不同;2)本种触肢胫节腹突和跗舟延伸部例不同,且前者腹部梨形,后者腹部长卵圆形;2)交媾腔分尖锐,而后者圆钝;3)胫节后侧突指状,而后者分叉.     

中国小腹茧蜂亚科(膜翅目,茧蜂科)一新属新种记述

按Mason(1981)分类系统记述分布于福建坳头洪坑的小腹茧蜂亚科1新属1新种,即赵氏茧蜂属Chaoa gen.nov.和黄足赵氏茧蜂Chaoa flavipes sp.nov,模式标本存福建农业大学生物防治研究所.     

广西苦苣苔科一新属——文采苣苔属

描述了在广西发现的苦苣苔科一新属和一新种,即文采苣苔属Wentsaiboea D. Fang & D. H. Qin及文采苣苔W. renifolia D. Fang & D. H. Qin, 并提供墨线图。文采苣苔属的柱头外形略似长檐苣苔属Dolicholoma D. Fang & W. T. Wang, 不同在于前者叶肾形,基部心形,具掌状脉,花冠斜钟状,裂片圆形,雄蕊和退化雄蕊着生于冠筒近基部。新属在体态上还接近小花苣苔属Chiritopsis W. T. Wang, 但前者叶具掌状脉,冠筒钟状,远轴侧膨胀,柱头马蹄形;在后者叶具羽状脉,冠筒筒状,不膨胀,柱头下唇倒梯形至线形。