大麦多数量性状相关分析

穗长、穗粒重两性对小区产量直接影响较大;每穗实粒数和每穗不实粒两性状数对小区产量直接影响很小,但通过其他性状对小区产量的间接负影响很大;每穗总粒数对小区产量直接负影响很大,株高通过其他性状对小区产量间接正影响很大。     

生态核不育大麦花粉的扫描电镜观察

对生态核不育大麦不育株和可育株的成熟花粉以及对照品种８９０９和鄂啤２号的成熟花粉进行了扫描电镜观察，发现生态核不育大麦不育株和可育株均含有空秕状和圆形、饱满两类花粉；两对照品种的花粉为圆形、饱满类型。生态核不育大麦可育株的圆形花粉与对照品种花粉一样，其萌发孔有明显突出的孔盖；而生态核不育大麦不育株的圆形花粉则无孔盖。因此，可认为萌发孔孔盖的有无是生态核不育大麦可育与不育花粉的典型鉴别特征。     

青稞秸秆对生长期藏绵羊体增重及免疫指标的影响

本试验用青稞秸秆替代燕麦干草作为唯一粗饲料来源,研究其对生长期藏绵羊体增重及免疫功能的影响。选择18只4~5月龄健康河谷型藏绵羊,随机分为2组,即:青稞组(青稞秸秆300 g/d+精料300 g/d)和燕麦组(燕麦干草300 g/d+精料300 g/d)。试验期4周,第1周为预试期,第2~4周为正试期。正试期结束后,按公母各占1/2原则,各组分别选取6只羊屠宰采样。结果发现:青稞组与燕麦组藏绵羊的体重、日增重、脾脏重和脾脏指数均差异不显著(P0.05);青稞组与燕麦组藏绵羊血清中免疫球蛋白(Ig)G、Ig A、Ig M、溶菌酶含量和酸性磷酸酶活性均差异不显著(P0.05),但青稞组中溶菌酶含量有高于燕麦组的趋势(P=0.083);青稞组与燕麦组血清、胸腺和脾脏白细胞介素(IL)-2、IL-4、IL-6、IL-10和干扰素γ(IFN-γ)含量均差异不显著(P0.05)。综合来看,与燕麦干草相比,饲喂青稞秸秆不会降低生长期藏绵羊的体增重及免疫性能,且有提高机体非特异性免疫因子(溶菌酶)含量的潜力,可作为藏绵羊的粗饲料来源。     

高寒藏区巴青1号青稞开花习性的研究

研究表明:巴青1号青稞在青海高寒地区种植,大部分在抽穗之后开花,小花开放顺序通常由中部向上下两端开放,单个花序开花持续时间为5~8d,群体开花时间可达到10d。一日开花高峰在上午09~11时和下午13~15时。青稞开花的适宜温度为17.2℃~22.6℃,相对湿度55%~65%,结实率为85.7%。     

Mechanical transmission of maize rayado fino marafivirus (MRFV) to maize and barley by means of the vascular puncture technique

Maize rayado fino marafivirus (MRFV) was mechanically transmitted to kernels of three Costa Rican maize cultivars by the vascular puncture technique. A transmission rate of up to 43.2% was obtained for cultivar HC-57. The rate of MRFV transmission to maize was possibly affected by the morphology of the kernel, which may influence physical access to the vascular tissue after water imbibition. Transmission to maize was confirmed by western blot and immunosorbent electron microscopy. By slight modifications of the procedure, MRFV was also transmitted to barley. This is the first report of MRFV infecting a species outside the supertribe Andropogonodae. Virus infection and replication in barley were confirmed by RT-PCR detection of MRFV RNA and by detection of the virus by ELISA.     

Field validation of a decision support system for the control of pests and diseases in cereals in denmark

The decision in 1986, on an action plan to reduce pesticide use in Denmark by 50% led to increased research on the potential of reducing dosages. A decision support system (PC-Plant Protection), developed by The Danish Institute for Plant and Soil Science, implements this research. It combines a detailed use of threshold values to support decisions on treatment need, choice of pesticides and the appropriate dosage for actual problems in cereals. The pest and disease module within the system has been available commercially since 1993 and up to the end of April 1995, 2000 licences have been issued for its use at agricultural schools and by advisers and farmers. The recommendation model for pest and disease control has been validated in field trials since 1990. The validation has shown that the model is able to provide recommendations for the control of pests and diseases to a satisfactory level, without affecting farmers' gross margins. The model was able to adjust pesticide use to large yearly variations and the average amount of pesticides in the plots treated according to the model was well below that in the reference plots and in the commonly used strategies in Denmark.     

<Emphasis Type="Italic">Dittrichia viscosa</Emphasis> and<Emphasis Type="Italic">Rubus ulmifolius</Emphasis> as reservoirs of aphid parasitoids (Hymenoptera: Braconidae: Aphidiinae) and the role of certain Coccinellid species

The role of the self-sown shrubsDittrichia viscosa (L.) W. Greuter andRubus ulmifolius Schott as reservoirs of aphid parasitoids was investigated. In the field studies conducted,D. viscosa grew adjacent to crops of durum wheat and barley andR. ulmifolius grew adjacent to cotton. The relative abundance of the parasitoids of(a) Capitophorus inulae (Passerini) onD. viscosa, (b) Rhopalosiphum padi (Linnaeus) on durum wheat and barley,(c) Aphis ruborum (Börner) onR. ulmifolius, and(d) Aphis gossypii Glover on cotton in various parts of Greece, was assessed during the years 1996–2000. In 2000, the fluctuation of parasitization of the above four aphid species was recorded and the action of the aphidophagous predators of the family Coccinellidae was studied. It was observed thatAphidius matricariae Haliday predominated onC. inulae andR. padi in all sampling cases. In contrast,Lysiphlebus fabarum (Marshall) was the dominant species parasitizingA. ruborum onR. ulmifolius andA. gossypii on cotton in Thessaly (central Greece) and Macedonia (northern Greece), whereasLysiphlebus confusus Tremblay et Eady andBinodoxys acalephae (Marshall) were the dominant parasitoid species in Thrace (northern Greece).Coccinella septempunctata Linnaeus was the most abundant coccinellid species on durum wheat, whereasAdonia variegata (Goeze) predominated on cotton. However, coccinellid individuals were scarce on bothD. viscosa andR. ulmifolius. The present study indicated that these two shrubs can be regarded as useful reservoirs of aphid parasitoids.     

Tolerance of four spring barley (Hordeum vulgare) varieties to weed harrowing

We investigated the tolerance to weed harrowing of four spring barley varieties and examined the possible interactions between varietal weed suppressive ability and two nutrient levels. Tolerance was defined as the combined effect of crop resistance (ability to resist soil covering) and crop recovery (the ability to recover in terms of yield). The weed harrowing strategy was a combination of one pre‐ and one post‐emergence weed harrowing. In terms of yield, the four varieties responded significantly differently to weed harrowing and the response depended on nutrient level. At the lower nutrient level, weed harrowing caused an increase in yield of 4.4 hkg ha⁻¹ for a strong competitor (cv. Otira), while there was no effect on yield at the higher nutrient level. For a weaker competitor (cv. Brazil), weed harrowing caused no change in yield at the lower nutrient level, whereas yield decreased by 6.0 hkg ha⁻¹ at the higher nutrient level. There were marked differences between the weed suppressive ability of the four varieties when not harrowed, with less pronounced but significant differences when harrowed. Weed harrowing did not change the weed suppressive ability of a variety. Varieties that are tall at post‐emergence harrowing and have increased density after pre‐emergence harrowing, are the ones that benefit most from weed harrowing.     

我国野生大麦种质资源的特色及其利用展望

综述了我国野生大麦的分布、种质资源特色,对我国野生大麦种质利用前景进行了展望.     

Alpha-amylase/subtilisin Inhibitor Levels in Australian Barleys

An enzyme-linked immunosorbent assay (ELISA) was used to determine the bifunctional alpha-amylase/subtilisin inhibitor (BASI) content of barley grain from 11 cultivars grown in six diverse locations in Australia. The inhibitor ranged from 119 to 254 μg/g in 57 barley samples. Genotype had a significant (P<0·05) effect on BASI content but there was no effect due to environment. Total protein varied independently of BASI and was influenced by environment and genotype. BASI content was higher (P<0·05) in malting barley than in feed barley and was correlated positively (r=0·29;P<0·05) with alpha-amylase activity in corresponding malts. The ELISA used monoclonal and polyclonal antibodies raised against purified BASI. In immunoblot analysis the monoclonal antibody showed high specificity for the inhibitor in barley and also detected the inhibitor in wheat. Low levels of inhibitor (mean 3·2 μg/g) were found in 12 Australian wheat cultivars using the ELISA developed for barley. The assay had a linear working range of 5–50 ng/mL with a detection limit of 2 ng/mL. Reproducibility between assays was good (CV=4·9%) but mean recoveries were high, ranging from 116–129% when purified inhibitor was added to barley extracts. The ELISA may have useful applications in brewing research and barley breeding programmes.