文种金鱼系统发育地位的研究

利用随机扩增多态ＤＮＡ技术，通过增加ＲＡＰＤ位点数进一步分析了文种鱼的系统发育地位。将ＲＡＰＤ扩增结果进行统计学分析。应用ＮＴＳＹＳ软件ＵＰＧＭＡ法聚类构建了金鱼主要代表品种发育的分子系统树。     

Analysis of intron sequence variability of the conservative HMG-box of Sox9 genes in allotetraploids and their original parents

The Sox genes of allotetraploids and their original maternal red crucian carp (Carassius caassius red var.) and original paternal common carp (Cyprinus carpio L.) were detected by PCR with the designed primers based on the conserved HMG-box sequence in different species. Sequencing of Sox genes indicated that two Sox9 genes (Atsox9a and Atsox9b) existed in allotetraploids, while only one Sox9 gene existed in red crucian carp (Rcsox9a) and common carp (Ccsox9b) . All of the four Sox9 genes contained an intron in the HMG-box. with the sizes of 413 bp, 703 bp, 401 bp and 714 bp, respectively. Moreover, the introns obeyed the rule of "GT-AG" . A high similarity was observed between introns of Atsox9a and Rcsox9a (94.4%), Atsox9b and Ccsox9b (97.8%). Interestingly, the deduced amino acid sequences of their corresponding exons all shared 100% identity. Thus, introns of the HMG-domain of Sox9s in allotetraploids and their original parents have not only the length polymorphism but also intron variability. Our results provide significant molecular evidence for the origin and evolution of allotetraploids.     

中国多年生野生大豆Glycine亚属rbcS基因的结构和系统发生的研究

用PCR法从我国多年生野生大豆Glycine亚属的烟豆 (GlycinetabacinaBenth .)和多毛豆 (短绒野大豆GlycinetomentellaHayata)的总DNA中扩增到Rubisco小亚基基因 (rbcS) ,2个基因的顺序分析结果表明它们包含了 5 37bp长的编码区 ,其编码的 178肽的Rubisco小亚基前体由 5 5个氨基酸组成的前导肽和 12 3个氨基酸组成的成熟肽组成 .基因内有 2个内含子 .比较Glycine亚属内烟豆和多毛豆之间的rbcS间碱基同源性为94 5 % ,差别主要存在于内含子中 ;Soja亚属的G .soja和G .max之间该基因同源性高达 99 7% ,而Glycine亚属和Soja两亚属之间rbcS同源性则为 84 8% .从这 2个亚属内 4个种的rbcS成熟肽 12 3个氨基酸顺序可知 ,同一亚属内 2个种之间仅有 2～ 3个氨基酸不同 ,而Glycine亚属和Soja亚属之间差异增大至 5～ 6个氨基酸 .系统进化树分析也表明Glycine亚属与Soja亚属在进化过程中分离较早 ,这从分子水平上为大豆属的分类研究提供了科学的依据 .     

从叶绿体DNA rbcL序列分析探讨五味子科的系统发育

以广玉兰Magnolia grandiflora，蝙蝠葛Menispermum dauricum，牡丹Paeonia suffruticosa和Illicium parviflorum为外类群，对五味子科的叶绿体rbcL基因进行序列分析，探讨其系统发育关系．结果表明，五味子科为一单系类群，与八角科关系最近，与木兰科关系较远．在严格一致性树中(Length=256，CI=0．8725，RI=0．8192)，五味子科被分为二支，一支由五味子属中的中华五味子亚属Subgen．Sinoschisandra，多蕊五味子亚属Subgen．Pleiostema和少蕊五味子亚属Subgen．Maximowixzia构成，支持率82％；另一支包括南五味子属和五味子属中的团蕊五味子亚属Subgen．Sphaerostema，重瓣五味子亚属Subgen．Plenischisandra．由此推断，五味子属和南五味子属关系密切，它们之间存在交叉和重叠，两属可能起源于共同的祖先．通过基因树分析，结合形态学、解剖学和化学证据认为，五味子S．chinensis和红花五味子S．rubriflora是五味子属中的原始类群．     

Comparative analysis of phospholamban phosphorylation in crude membranes of vertebrate hearts

Summary Phospholamban, a sarcoplasmic reticulum phosphoprotein, is present in the hearts of mammalian, avian, amphibian, and fish species. Phylogenetic changes are indicated by marked differences among species in cardiac phospholamban content and by the absence of Ca²⁺/calmodulin-dependent phospholamban phosphorylation at an early developmental stage.     

Analysis of intron sequence variability of the conservative HMG-box of Sox9 genes in allotetraploids and their original parents

The Sox genes of allotetraploids and their original maternal red crucian carp （Carassius caassius red var.） and original paternal common carp (Cyprinus carpio L.) were detected by PCR with the designed primers based on the conserved HMG-box sequence in different species. Sequencing of Sox genes indicated that two Sox9 genes (Atsox9a and Atsox9b) existed in allotetraploids, while only one Sox9 gene existed in red crucian carp (Rcsox9a) and common carp (Ccsox9b). All of the four Sox9 genes contained an intron in the HMG-box, with the sizes of 413 bp, 703 bp, 401 bp and 714 bp, respectively. Moreover, the introns obeyed the rule of “GT-AG”. A high similarity was observed between introns of Atsox9a and Rcsox9a (94.4%), Atsox9b and Ccsox9b (97.8%). Interestingly, the deduced amino acid sequences of their corresponding exons all shared 100% identity. Thus, introns of the HMG-domain of Sox9s in allotetraploids and their original parents have not only the length polymorphism but also intron variability. Our results provide significant molecular evidence for the origin and evolution of allotetraploids.     

一株中度嗜盐菌Halomonas sp.NY-011的分离与鉴定

从盐生杜氏藻（Dunaliella salina）培养物内筛选到一株能在广泛NaCl浓度范围（0.5 %～21 %, w/v）和广泛pH值范围（pH 5～11）生长的嗜碱耐盐菌NY011.细胞形态电镜观察和生理生化分析表明, NY-011呈杆状,大小为（0.51～1.53）μm×（1.02～2.55）μm,革兰氏阴性,有荚膜,无鞭毛,不运动,好氧生长,淀粉水解酶呈阴性,接触酶呈阳性.其最适培养条件为：2% NaCl,30 ℃,起始pH值10.16S rDNA序列比对和构建的系统发育树表明该菌属于盐单胞菌