共查询到20条相似文献,搜索用时 78 毫秒
1.
异育银鲫寄生粘体虫属一新种(粘孢子纲:双壳目:粘体科) 总被引:1,自引:0,他引:1
本文记述寄生在异育银鲫腹腔的粘体虫一新种,定名为辽宁粘体虫,新种Myxosoma liaoningensis sp.nov。新种与大形粘体虫Myxosoma magna近似。模式标本保存在辽宁省淡水水产研究所。 相似文献
2.
研究从中国东海的青石斑鱼 Epinephelus awoara Temminck & Schlegel 1842和褐带石斑鱼E. bruneus Bloch 1793的胆囊中检获了石斑角形虫 Ceratomyxa epinephela Wu, Wu et hua, 1993, 首次提供了其SSU rDNA和ITS1 rDNA序列, 并基于形态学和分子数据进行了重新描述。石斑角形虫成熟孢子的孢子长(4.8±0.5) μm (3.6—5.6 μm), 孢子厚(31.8±4.8) μm (23.3—37.5 μm); 孢子壳瓣光滑且等大, 由垂直的缝线连接; 极囊长(2.9±0.2) μm (2.4—3.7 μm), 极囊宽(2.6±0.2) μm (2.2—3.1 μm); 孢子夹角处稍微凹陷, 延伸至两端逐渐变平坦, 夹角为 (175.9±3.7)° (165.5°—179.7°)。基于SSU rDNA序列构建的系统发育树显示石斑角形虫与诺兰角形虫C. nolani Gunter & Adlard 2009, 卡特莫尔角形虫C. cutmorei Gunter & Adlard 2009和横山角形虫C. yokoyamai Gunter & Adlard 2009 有很近的亲缘关系, 且其宿主均为石斑鱼属物种。结果表明, 类群关系较近的宿主其寄生的同属黏孢子虫可能具有更近的系统发育关系。基于SSU rDNA和ITS1 rDNA的遗传分析显示, 石斑角形虫的4个分离株已发生了明显的遗传分化(形成了4个基因型), 形成了不同的种群, 但在不同宿主种类间并未形成特有的分化。 相似文献
3.
本文报导四川省西部鱼类寄生粘孢子虫粘体虫属六新种,即异型粘体虫,新种Myxosoma disparis sp.nov.,四川粘体虫,新种Myxosoma sichuanensis sp.nov.,光唇粘体虫,新种Myxosoma acrossochilusi sp.nov.鳅粘体虫,新种Myxosoma nemachilusi sp.nov.斜囊粘体虫,新种Myxosoma obliqua sp.nov.,雅安粘体虫,新种Myxosoma yaanensis sp.nov.。 相似文献
4.
1979年8月25日,我们在江苏省洪泽湖进行鱼类寄生虫区系调查过程中,从岔尾黄颡鱼Pseudobagrus eupogon Boulenger 的胆囊中发现一种粘孢子虫。经鉴定,是属于角形科 Ceratomyxidae角形虫属Ceratomyxa的代表,不仅是科学上的新种,也是角形科角形虫属的种类在我国第一次发现,同时又为该属记录了在淡水鱼类中第二种寄主。 模式标本保存在中国科学院水生生物研究所。 相似文献
5.
报道了中华倒刺鲃鳃上的粘体虫一新种,即倒刺鲃粘体Myxosoma spinibarbi sp.nov.;寄生于白鲢肾中的碘泡虫一新种,即马氏碘泡虫Myxobolus mai sp.nov.,将2种与近似种进行了比较。 相似文献
6.
鱼类寄生粘孢子虫两新种(粘孢子目:粘体科,碘泡科) 总被引:2,自引:0,他引:2
本文报道寄生鱼类体表的粘孢子虫两新种:寄生在胡子鲇的珠江粘体虫Myxosoma zhujiangensis sp.nov.和寄生在麦瑞加拉鲮Cirrhina mrigala的广州碘泡虫Myxobolus guangzhouensis sp.nov.。 相似文献
7.
中国西部淡水鱼类寄生粘孢子虫的记述:粘孢子纲:双壳目 总被引:1,自引:0,他引:1
本文报道新疆与四川淡水鱼类寄生粘孢子虫7种,即阿勒泰两极虫,白甲两极虫,宁南两极虫,Ju楚克拉虫,杜氏粘体虫,宜宾碘泡虫,鲈尾孢虫,除杜氏粘体虫和鲈尾孢虫外,其余5种为新种。本文是首次对新疆地区粘孢子虫研究的报道。 相似文献
8.
报道寄生在鲤鱼鳃丝上的粘孢子虫1新种,即异囊粘体虫Myxosoma heterocapsularis sp.nov.,标本采自重庆市北部区歇马养殖场及嘉陵江,文内记述新种的形态结构。 相似文献
9.
10.
本研究选取15个主要特征对我国淡水鱼类23属粘孢子虫的支序分类进行了分析.结果表明,根据这15个特征构建的经典分支系统树与现有分类系统较为一致;而许多被分子系统学证明有争议的特征,如尾孢虫的尾突,孢子和极囊的形状等在研究粘孢子虫的系谱发育中仍然有着重要作用,剔除了上述特征的分支系统树与经典的分支系统树相比,存在许多缺陷.嗜碘泡是区分粘体虫和碘泡虫的主要特征,然而剔除嗜碘泡特征的分支系统树与经典的分支系统树区别不大,因此,我们建议在这一方面和国际学术界统一起来,即不再把嗜碘泡作为区分碘泡虫和粘体虫的主要特征. 相似文献
11.
CARBOHYDRATE METABOLISM IN THE EGGS OF THE SILKWORM, BOMBYX MORI. I. ABSENCE OF PHOSPHOFRUCTOKINASE IN THE DIAPAUSING EGG 总被引:1,自引:1,他引:0
In the diapausing eggs of the silkworm, Bombyx mori , glycogen is rapidly converted to sorbitol and glycerol, and this conversion is reversed at termination of the diapause (C hino , 1958). To elucidate the pathway leading to this polyol formation and its regulatory mechanisms, enzymes concerning carbohydrate metabolism were surveyed in diapausing as well as in developing eggs of the silkworm.
Most of the enzyme activities concerning citric acid cycle are low at the beginning of the embryogenesis and during diapause, but increase at the later stages of the development. Making an exception, reduction rate of malate and fumarate was rather high from the onset of the embryonic development. Several glycolytic enzymes were also studied. Most remarkable fact is that phosphofructokinase activity could not be demonstrated in the diapausing and also in the early stages of the developing eggs. Other enzymes, viz. α-glycerophosphate dehydrogenase, aldolase, glyceraldehyde-3-phosphate dehydrogenase were detected from the beginning of the embryogenesis.
Absence of phosphofructokinase, together with the high activity in glucose-6-phosphate dehydrogenase, suggests that predominant pathway in carbohydrate metabolism in the early stages of embryogenesis and in the diapause period is by way of pentose phosphate pathway. This supposition is confirmed by the experiments using labeled glucose. Incorporation of the label into glycerol of the diapausing eggs was three to four fold when G-6-14 C was injected into pupae as compared with the case of G-1-14 C injection. The above experiments provide evidence supporting the theory that glycogen is converted into sorbitol and glycerol mostly by way of the pentose phosphate pathway in the diapausing eggs. 相似文献
Most of the enzyme activities concerning citric acid cycle are low at the beginning of the embryogenesis and during diapause, but increase at the later stages of the development. Making an exception, reduction rate of malate and fumarate was rather high from the onset of the embryonic development. Several glycolytic enzymes were also studied. Most remarkable fact is that phosphofructokinase activity could not be demonstrated in the diapausing and also in the early stages of the developing eggs. Other enzymes, viz. α-glycerophosphate dehydrogenase, aldolase, glyceraldehyde-3-phosphate dehydrogenase were detected from the beginning of the embryogenesis.
Absence of phosphofructokinase, together with the high activity in glucose-6-phosphate dehydrogenase, suggests that predominant pathway in carbohydrate metabolism in the early stages of embryogenesis and in the diapause period is by way of pentose phosphate pathway. This supposition is confirmed by the experiments using labeled glucose. Incorporation of the label into glycerol of the diapausing eggs was three to four fold when G-6-
12.
13.
《Ibis》1957,99(4):688-692
A hitherto unreported breeding site of the Lesser Flamingo Phoeniconaias minor is recorded in the Mweru Wantipa or Mweru Marsh, Northern Rhodesia. The site of the nesting colony, its structure, nest construction and behaviour of the birds is described. The importance of flooding in determining the site of the nesting colony is noted; adverse conditions caused by a rise in the water-level of Lake Mweru Wantipa appear to have completely destroyed the nests. The instability of such environments does not offer much chance of regular and permanent breeding, and may influence local movements on the part of the birds. 相似文献
14.
W. H. Weidlich 《American journal of botany》1976,63(10):1365-1379
The anatomy and organization of the stem vascular system was analyzed in representative taxa of Nymphaea (subgenera Anecphya, Lotos, and Brachyceras). The stem vascular system consists of a series of concentric axial stem bundles from which traces to lateral organs depart. At the node each leaf is supplied with a median and two lateral leaf traces. At the same level a root trace supplies vascular tissue to adventitious roots borne on the leaf base. Flowers and vegetative buds occupy leaf sites in the genetic spiral and in the parastichies seen on the stem exterior. Certain leaves have flowers related to them spatially and by vascular association. Flowers (and similarly vegetative buds) are vascularized by a peduncle trace that arises from a peduncle fusion bundle located in the pith. The peduncle fusion bundle is formed by the fusion of vascular tissue derived from axial stem bundles that supply traces to certain leaves. The organization of the vascular system in the investigated taxa of Nymphaea is unique to angiosperms but similar to other subgenera of Nymphaea. 相似文献
15.
16.
17.
18.
THE LIFE-HISTORY OF THE PLUM-RUST IN ENGLAND. 总被引:1,自引:1,他引:0
19.
Thomson, Betty F., and Pauline Monz Miller. (Connecticut Coll., New London.) The role of light in histogenesis and differentiation in the shoot of Pisum sativum. III. The internode. Amer. Jour. Bot. 50(3): 219–227. Illus. 1963.—Seedlings of Pisum sativum were grown under constant conditions and exposed daily to red or white fluorescent light or kept in total darkness. Counts and measurements of internodal cells in both transverse and longitudinal directions show that light does not alter the sequence or pattern of tissue differentiation, including the sequence of xylem maturation within the vascular bundle. Light does accelerate the rate of a constant course of differentiation. Light advances the time of division and enlargement of cortex, xylem, phloem, and pith cells in the longitudinal direction but reduces both the final number and the final length attained in all cases. It is concluded that light accelerates all phases of shoot growth and differentiation and that cell division and elongation in the later phases of internodal growth are reduced by light because of accelerated cell maturation. 相似文献
20.