应用种间杂交方法进行谷子抗除草剂育种的初步研究     

马金丰 《黑龙江农业科学》2005,(2):18-20

野生青狗尾草与中国栽培谷子进行杂交,并用浸有氟特力溶液的小培养皿进行发芽试验,快速鉴别F2代的抗除草剂性能。抗性被隐性基因控制,但更确切的结果有待进一步试验。氟特力不同用药量的选择试验表明,对氟特力抗性与敏感不同的谷子品种在 0~2.4 L/hm2 的处理表现不同,抗型品种的抗性大约是敏感型抗性的5倍。为我们选育谷子抗性新品种提供了依据。  相似文献   

河北植物新增补属、种与入侵物种新分布     

曲红  路端正  王百田 《河北林果研究》2007,22(3):257-258

报道了《河北植物志》与《河北高等植物名录》未记录的植物1属3种1变种。其中拔毒散(Sida szechuen-sis Matsuda)、偃狗尾草[Setaria viridis(L.)Beauv. var. depressa(Honda)Kitag.]在河北省首次记录。  相似文献   

云南怒江干热河谷区咖啡绿蚧周年发生规律研究     

李贵平 《热带农业科技》2004,27(3):17-19,22

对云南怒江干热河谷区咖啡绿蚧的调查表明:咖啡绿蚧单株虫口数量变化与平均温度的变化呈显著正相关(r=0.6984),为害率的变化与单株虫口数量的变化呈极显著正相关(r=0.7651),繁殖速度与平均温度增量呈显著正相关(r=0.6984),扩散传播速度与繁殖速度呈极显著正相关(r=0.8408),周年变化曲线呈双峰曲线。  相似文献   

A NEW SPECIES OF THE GENUS CONFUSACRIS FROM DAXING'ANLING AREA (ORTHOPTERA: ACRIDIDAE)     

任炳忠  张凤岭 《林业研究》1994,(3)

CONFUSACRISVIRIDISSP.NoV.(FIGS-l-5)Ma1eBodysmaller,headshort,lengthshorterthanpronotum.Vertextri-angle,withdistinctmediancarina.Foveolaeabsent,fronsseeninprofileverysloping.Frontalridgedistinct,withashal-lowgrooveinaIlthelength.Eyesoblong,itsverticaldiameterl.4otimesthehorizon-taldiameter,l.l7timesthelengthofsubocularsuture.Antennanarrowensiformandlonger,itslengthl.74timesthelengthofheadandpronotum;thelengthofmiddlejointl.83timesitswidth.Anteriormarginofpronotumstraight,posteriorma…  相似文献   

4种单胞藻对卤虫生长和生殖影响的比较研究   总被引：1，自引：0，他引：1  

赵素芬  黎建余 《福建水产》2005,(4):46-49

以亚心形扁藻、小球藻、湛江等鞭金藻、绿色巴夫藻为饵料,卤虫为投喂对象,建立五个实验组分别进行研究,观察不同饵料对卤虫生长和生殖的影响,结果表明:投喂亚心形扁藻的卤虫生长最快,成活率高,生殖量也最多,其次为绿色巴夫藻组,湛江等鞭金藻的饵料效果最差.混合4种单胞藻投喂的效果也较好.  相似文献   

Microcystin production during algal bloom occurrence in Laguna de Bay, the Philippines   总被引：1，自引：0，他引：1  

SUSANA F  BALDIA    MA CECILIA  G CONACO  TOSHITAKA  NISHIJIMA  SUSUMU  IMANISHI  KEN-ICHI  HARADA 《Fisheries Science》2003,69(1):110-116

ABSTRACT:   The amount of microcystin in Microcystis aeruginosa bloom was investigated during the rainy season of 1999 in Laguna de Bay, the Philippines. Bloom samples taken from the West Bay and East Cove stations of the lake were studied in relation to the characteristics of environmental conditions. Four types of microcystins, microcystin-LR (MC-LR), microcystin-RR (MC-RR), 6(Z)-Adda-microcystin-RR, and 3-desmethylmicrocystin-LR were identified from the natural bloom samples among which MC-LR was the most dominant type of microcystin. Production of microcystin (88.6 µg/100 mg dried cells) was highest during the first sampling week that coincided with high water transparency and high conductivity. The occurrence of a strong typhoon during the second sampling week had changed the environment drastically, which was characterized by low water transparency, high turbidity, low water temperature, and with trace amounts of MC-LR detected at the East Cove station. Thus, toxin production over time as well as the relationship between Microcystis production and toxin concentration could not be fully evaluated.  相似文献   

Evaluation of shrimp polyculture system in Thailand based on stable carbon and nitrogen isotope ratios   总被引：1，自引：0，他引：1  

HISASHI YOKOYAMA  JUNYA HIGANO a  KUMIKO ADACHI  YUKA ISHIHI  YOSHIHIRO YAMADA b 《Fisheries Science》2002,68(4):745-750

ABSTRACT: To quantify the contribution by cocultured animals to waste assimilation in an intensive shrimp farm in Thailand, the food web structures of the macrobenthos in a reservoir pond, a shrimp culture pond and water treatment ponds were examined using the stable C and N isotope ratio technique. Seawater for aquaculture was drawn from a creek, and stored in a reservoir pond, used for farming the banana prawn Fenneropenaeus merguiensis in culture ponds, and then recycled through treatment ponds where the green mussel Perna viridis was cultured to remove organic wastes discharged from the farming. The clam worm Nereididae sp. and the mud creeper Cerithideopsilla cingulata in the culture pond had δ ¹³C values of −21.0‰ and −18.4‰, respectively, suggesting that shrimp feed (mean δ ¹³C = −20.7‰) was the main food source for these species. The δ ¹³C analysis also suggested that sediments (−23.7‰) in the reservoir pond and particulate organic matter (POM) (−24.0‰) and/or sediments (−25.0‰) in the treatment pond supplied carbon for most macrobenthic animals. However, green mussels in the treatment pond had a mean δ ¹³C value of −20.5‰, suggesting that shrimp feed was the main food source for this species.  相似文献   

Potential for Selection in the Progeny of an Interspecific Hybrid in Foxtail Millet     

G. R. Zangre  H. Darmency 《Plant Breeding》1993,110(2):172-175

Genetic variation for morphology and grain yield components was studied in the F₂ and 14 F₃ families of an interspecific cross of Setaria italica (foxtail millet) with S. viridis s. s. (green foxtail). It appeared possible to recover the cultivated type using a simple selection procedure in F₂ and F₃. Comparison with a cross involving S. viridis var. major (giant green foxtail) is discussed.  相似文献   

Fast and efficient discrimination of the Isotoma viridis group (Insecta: Collembola) by PCR-RFLP     

Ulrich Burkhardt  Juliane Filser   《Pedobiologia》2004,48(5-6):435-443

Identification of collembolan species is generally based on specific morphological characters, such as chaetotaxy and pigmentation pattern. However, some specimens do not match to described characters because these refer to adult specimens, often of one specific sex, or the characters are highly variable in adults (e.g. pigmentation, setae or furcal teeth). Isozymes have frequently assisted species discrimination, and also these may vary with developmental stage or environmental conditions. For identification of single species of the Isotoma viridis group, we present both direct sequencing of the cytochrome oxidase subunit II (COII) gene and a simple DNA-based molecular method.

Five PCR primers amplifying the COII region (717 bp) of the mitochondrial DNA were used. The sequences clearly separated the species I. viridis, I. riparia and I. anglicana, irrespective of colour varieties within the first species. DNA amplification products of different species can also be distinguished by digestion with restriction endonucleases, followed by gel electrophoresis for separation of fragments. This restriction fragment length polymorphism (RFLP), obtained after digestion with the endonucleases TaqI, VspI, MvaI and Bsp143I, revealed specific fragments that separated the three species from each other. Since restriction enzymes are sensitive to single base mutations, we suggest to use a combination of enzymes with at least two species-specific restriction sites when using the RFLP technique. For the I. viridis complex, VspI and Bsp143I appear to be an appropriate combination.  相似文献   

附生细菌在微囊藻（Microcystis）藻华颗粒上的定殖和生长     

马喆  王勤  肖琳  蒋丽娟  杨柳燕 《农业环境科学学报》2007,26(5):1894-1897

通过测定微囊藻模拟藻华颗粒和微囊藻水华藻华颗粒表面附生菌数量的变化,分析微囊藻（Microcystis）与附生假单胞菌（Pseudomonas）之间相互作用关系。结果表明,在死亡藻体的模拟藻华颗粒表面附生菌数量迅速增加,而活藻藻华颗粒表面附生菌数量增长缓慢,在培养后期藻体大量死亡,附生细菌的数量不断增加,最后超过死亡藻体的模拟藻华颗粒的附生细菌数量。附生细菌在天然微囊藻藻华上定殖和生长也呈现类似的趋势,由于附生菌同藻华中微囊藻之间存在竞争,附生菌的存在促进藻体团聚,抑制附生细菌的定殖,但是在微囊藻的衰亡期产生的大量营养物质有利于附生细菌的生长,水体中附生细菌的数量不断增加,同时天然藻华上附生细菌的数量也大量增加,有利于其生长和定殖。  相似文献