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- Keywords：maize,acetylcholine,acetylcholinesrtersae3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：wheat,heat acclimation,heat stress,relative conductivity,ultrastructure1|5|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：cut rose,anti-oxidant,tolerance to water deficit stress10|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Activation is a key step of somatic cell cloning. In this study, the effects of several chemical activation reagents such as ethanol, calcium ionophore A23187 and ionomycine followed by either phosphorylation inhibitor 6-dimethylaminopurine (6-DMAP) or cycloheximide (CHX) on activation of goat oocytes were compared., In addition ,the development ability of aging oocytes after activation was also studied . The results show: 1)ionomycine group had higher activation rate than ethanol and A23187 groups (89.6% vs 63.5%,68.7%; P<0.05). 2)the activation rate of ionomycine + 6-DMAP group was significantly higher than ionomycine + CHX or ionomycine + CHX + cytochalasin D group(90.1% vs 58.9%,63.7%; P<0.01). 3)the morula rates of 24,26,28 hour groups were 16.0%, 20.6% and 33.3% respectively, while decreased in 30 hours(13.8%). These results suggest that ionomycine combined with 6-DMAP at 28 hour after maturation is the optimal condition for goat oocytes activation.Keywords：sheep,oocytes,chemical activation1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A new terminological scheme for the wing venation of Myrmeleontidae was proposed based on the comparative morphological study. The homologies of the main veins of the fore and hind wings are determined from the following aspects, i. e., the venation of neoteric and fossil species in the family, the hypothetical typical venation of insects, the venation of outgroups, the morphological features of the main veins of fore and hind wings, and the terminologies for the venation of the family known previously.Keywords：Myrmeleontidae,Neuroptera,terminology of wing venation2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Vectorization precision under different distinguishing and magnifying rates of computer screen was studied with AutoCAD for geography spatial grid image data. The results indicated that the screen magnification methods had great effect on the precision. The errors of mean square and limitation of point position decreased with increasing magnification. High precision was obtained at 8 to 10 times of magnification. The mean square error of the point position could be under 0.08mm, about 40% of the allowed error. The distinguishing rates of computer screen did not produce significant influence on the precision. It is important to concern the precision during manual operation of GIS database.Keywords：GIS,vectorization,precision,distinguishing rate,AutoCAD0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the in vitro growth effect of 9 common CTMs on Bifidobacterium bifidum and lactobacillus acidophilus. These CTMs include Radix isatidis, Radix bupleuri, Radix rhei, Mirabilitum depuratum, Cortex magnoliae, Fructus forsythiae, Fructus lycii, Fructus schizandrao, Rhizoma rehmanniae. Using the Hungate-anaerobic technology to enumerate these two strains of bacteria which grew in media composed of CTMs extraction. The effect of the first three CTMs to Bifidobacterium bifidum is not obvious, but the effect on L. acidophilus is inbitory (P< 0.05), and the inhibition is not in accordance with different concentrations. The other three of the forth to sixth CTMs strongly inhibited the growth of two bacteria in according to the concentration (P<0.01 or P<0.05). The last three CTMs obviously improved the growth in line with concentration(especially to Bifidobacterium bifidum P<0.05). CTMs not only can play the role of curing and guarding against disease, but also can improve the immunity of body. To some extent, CTMs may replace the using of antibiotic to play an important role on intestinal microecology balance.Keywords：Chinese traditional medicine(CTM),Bifidobacterium bifidum,Lactobacillus acidophilus,the in vitro growth2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Tactics of three level of overall sampling ratios (5%, 15% and 25%) from the whole collection is abopted in order to acquire optimal primary core collection of common wild rice (Oryza ryfipogon Griff.) were studied, using 5 571 accessions from the national genebank, Which are classified as 19 types based on agronomic and morphological characters. The three levels are grouping principle, sampling proportion within group and sampling method from each group. Grouping principles included the consideration of differeat provinces, latitudes, growth habits, single character and completely random sampling without grouping. Method of sampling proportion in each group are square root, logarithm, index of genetic diversity and fixed proportion. Clustered and random samplings are carried out in each group. The result showed that retained ratio of phenotypic retained had a notable increase when the overall sampling ratio increased from 5% to 15%, whereas, the ratio of phenotypic core collections has considerably has a little increase when the overall sampling ratio increased from 15% to 25%. It is concluded that 15% should be the appropriate overall sampling ratio for primary core collection of common wild rice in China. The best sampling strategies should be based on a principle grouped by provinces, as well as sampling proportion within group based on logarithm and cluster sampling method. Based on this scheme, 860 accessions of common wild rice are sampled by computer as primary core collection. The index of genetic diversity, coefficient of variation, variance of phenotypic value are 1.101 5,16.87,0.854 6,respectively. Compared with the counterparts of national genebank, these parameters of primary core collections are all increased significantly. Furthermore, based on phenotypic data from national genebank, 60 accessions are also supplemented for application oriented. Finally, total 920 accessions of primary core collection are set up.Keywords：Oryza rufipogon Griff.,primary core collection,sampling strategy1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：high oil corn,TEU model,practical effect,xenia1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：Gladiolus,cormel,physiological and biochemical characters,index1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The health evaluation of 22 accessions of common bean (Phaseolus vulgaris L.) was carried out in the laboratory based on dry examination and rolled blotter test. According to seed coat pigmentation, all accessions were divided into unpigmented and pigmented groups. Insect injuries were most frequently present on unpigmented accession seed coat. Malformation, shrivelling, discoloration and spots were found in both unpigmented and pigmented accessions. Pigmented seed accessions had a lower proportion of seeds with various symptoms and disorders. Eleven genera and species of fungi were detected in all accecsions. Rhizopus spp. was the most frequent genus present in all accessions, followed by Fusarium spp. and Penicillium spp. The incidence of Alternaria alternata was also high, eight of eleven unpigmented accessions tested were infested with this species. Colletotrichum lindemuthianum was found to occur only in seeds of PRESENTA. The incidence of microorganisms was higher in unpigmented accessions than pigmented accessions. Capacity of seed germination was influenced by malformation and shrivelling. The results of visual examination could serve as parameters indicating seed health status of common bean seeds and provide guides to handling germplasm accessions.Keywords：common bean,germplasm,seed health0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Black leaf spot is a worldwide fungal disease of crucifers important. It caused severe losses in North China during the 1990s and is still a potential threat at present. Alternaria brassicae, A. brassicicola and A. japonica are pathogens of black leaf spot. The pathogenic fungus can be identified by their morphology, variation, nucleotide acid sequence, isoenzyme, and ELISA. Among these techniques, the nucleotide acid sequence analysis is No.1 much quick and practical. Toxins produced by the fungus are significant pathogenic factors. Molecular biological methods have been used for detection and identification of the pathogens in seeds. Effective measures for the disease control include seed treatment and fungicides of lower toxicity. It is proposed that future directions of investigating should be the pathogenic constituents, disease epidemic, and methods for seed health testing on the molecular levels, as well as the improvement of bio-control on the basis of fundamental research and technological innovations.Keywords：cruciferous vegetables,seed-borne black spot disease,Alternaria brassicae,A. brassicicola,A. japonica3|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：winter wheat,phosphorus efficiency,sensitivity to low phosphorus,stability1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The effects of different water and fertilization conditions on iron leaching, spatial distribution and uptake by rice (Oryza sativa L.) were studied with soil column. The results showed that 1) iron (Fe) concentration in leacheates decreased rapidly with the submerging time. Although the wetting and flooding treatments had similar Fe concentration in leachates, the later had higher total leached quantity; 2) DTPA-extractable Fe and exchangeable Fe in soil profile were significantly affected by water and fertilization conditions. The treatments of no fertilizer with flooding (CK), NPK fertilizer with flooding (NPK) and NPK fertilizer and pig manure with flooding (NPKM) had higher values than that of NPK fertilizer and pig manure with wetting (NPKM/W). But the total Fe in soil profile changed little. There was no difference among the four water and fertilization treatments; 3) The Fe uptake by rice also followed the sequence: NPKM/WKeywords：water and fertilization conditions,soil column,iron,rice5|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：dialysis,pepsin-pancreatin,rapeseed meal,crude protein,digestibility1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：degradation,cell wall,bacteria,protozoa,fungi,gas production2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The study compared the difference of digestiveon performance on dietary fibers in 5 and 7-month old Emus, the same old Turkeys and adult Cocks. The results showed that 1) the intakes, excretion and digestion of crude fiber (CF), acid detergent fiber (ADF) and neutral detergent fiber (NDF) in Emus were higher than that in Turkeys and Cocks (P<0.05); 2) digestibility of CF and ADF tended to become higher in Emus at 5-month old than in Turkeys and Cocks, but this tendency became significances (P<0.05) at 7-month old; 3) compared with Cocks and Turkeys, NDF digestibility of Emus was significantly higher at 5 and 7-month old (P<0.05); 4) digestibility of CF, ADF and NDF in the Emus increased significantly according to the increase in age(P<0.05). It is concluded that all trial animals were able to digest different fibers although the degrees differed, and the digestive capability over the fibers of Emus is higher than of Cocks and Turkeys at digestion or digestibility, especially, this capability of Emus is greatly increased by increase in age.Keywords：Emus,Turkeys,Cocks,fibers,digestive performance,0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This paper attempts to analyzes the impacts of China's entry to WTO on agriculture quantitatively with GTAP model. The results suggest that China's grain market will develop relies mainly on domestic factors. If Chinese economy continues to grow at high speed, the growth of demands for grains is likely to exceed supply, leading to a rising of domestic prices. Fluctuations in supplies in domestic market or international market will have notable impacts on market prices. To some extent, this will help to stabilize grain market because price mechanism can play its role more effectively to adjust demand and supply. Therefore our country doesn't confront magnificently risks of national food security. However, fluctuations of domestic grain market prices may lead to instability of peasants' income, therefore the government needs to take proper measures to cope with the problem.Keywords：GTAP model,agricultural trade,grain market stability,food security0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
