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- Keywords：rice,remote crossing,net photosynthesis,special leaf area,fluorescence induction kinetics5|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Root characters and the leaf water potential were tested and compared between upland and paddy rice cultivars, including seven upland rice cultivars and eight paddy rice cultivars, which are come from Japan, East China, North China and Northwest China respectively, cultivated under drought field and aeroponic culture system. The results showed that root length, root number, base thickness, middle thickness of root, and root volume in drought field correlated significantly with that under aeroponic system culture. The root characters studied were very different between upland and paddy rice. The root of upland rice was longer than that of paddy rice. Root base thickness of upland rice cultivars was thicker than that of paddy rice. The leaf water potential of upland rice cultivars was higher than that of paddy rice. There were significant correlations between leaf water potential and root length, base thickness of root. There was also a significant correlation between base thickness of root during seedling stage and base thickness of root during seed filling stage. Therefore root base thickness may be as a criteria to identify drought resistance of rice during seedling stage.Keywords：upland rice,paddy rice,root length,root thickness,leaf water potential1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Some yield and physiological characters, including panicle length, weight of panicle, kernel number per panicle, percent of seed setting, 100 kernel weight, weight of grain per plant, plant height, leaf water potential, flesh leaf weight, stoma resistance and degree of leaf rolling, were compared between a set of 8 paddy rice cultivars and a set of 7 upland rice cultivars. They are all early mature japonica type, which are come from Japan, Northeast China, North China and Northwest China respectively, and were cultivated under 3 different conditions, i.e. submerged in pot, rain fed in pot and rain fed in field. The results showed the yield of paddy and upland rice under submerged condition were higher than that under rain fed condition. Index of drought resistance (yield per plant under rain fed cultivation/yield per plant under submerged cultivation) of upland rice cultivars were higher than that of paddy rice cultivars. Plant height under rain fed condition were lower than that under submerged condition. Leaf water potential of upland rice cultivars were all higher than that of paddy rice cultivars, and there was a significant correlation between leaf water potential and index of drought resistance. Stoma resistance of upland rice cultivars was lower than that of paddy rice cultivars under rain fed condition, however there was no fixed trend if the two kinds of cultivars were cultivated under submerged condition. The difference in flesh leaf weight were not significant among cultivars, though the upland ones were little higher for upland rice cultivars. The degree of leaf rolling of upland rice cultivars were lower than that of paddy rice cultivars. In addition, an approach of drought resistant evaluation for upland and paddy rice cultivar is proposed, i.e., firstly investigating roots growth and degree of leaf rolling under rain fed condition during seedling period, then testing water potential of leaf in the later period.Keywords：paddy rice,upland rice,drought resistance,yield character,physiological character0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：rice,leaf age,nitrogen operation,yield,quality,N applying efficiency5|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Photosynthetic matter transportation and partitioning of wheat flag leaf were studied. The wheat plants were exposing to different soil water and under HK6 (a new PGR) regulation condition during grain filling stages using in vivo dynamic method and in vitro determination 14 CO 2 technique. The results showed that active period of 14 C assimilates transportation out of the wheat flag leaf is within 1.5 days when they are formed and the assimilates' dynamic transportation and distribution were different in respond to various treatments. During determination period, the output rate of assimilate followed a logistic curve in the prophase of filling stages, while a linear pattern of output happened in the anaphase. Deficit water treatment caused the curve more fluctuating, fastened the transportation of 14 C and impacted the partitioning rate of assimilates within different parts of plant, favoring the supply to root; systemically chemical control was helpful to export and partition for assimilates and shortened the half time of 14 C assimilates transporting, especially in late grain filling stage, can alleviate the adverse impacts caused by water shortage in the anaphase of kernel filling.Keywords：winter wheat,soil water,chemical regulation,assimilate transportation and partition14|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The composition of high molecular weight glutenin subunits (HMW GS) in 7 Triticum timopheevii and 8 T.araraticum were analyzed by SDS PAGE and PCR. 8 allelic variations were detected at Glu 1G locus. PCR primers specific to y type HMW GS were used to investigate the storage protein among 7 T.timopheevii and 8 T.araraticum too. The PCR analysis indicated that the high level genetic diversity were found at Glu 1G locus which confirmed the results obtained by using SDS PAGE method. There are specific HMW GS in T.timopheevii and T.araraticum as compared with those of 1A?1B and 1D in common wheat.Keywords：Triticum timopheevii,T.araraticum,G genome in wheat,high molecular weight glutenin subunits(HMW GS),Glu 1Y locus,Glu 1G locus13|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The paper presents the result of computer aided identification of 40 species of insects by using their 11 mathematical morphological features (MMF). The weight and importance of each MMF is evaluated on the basis of their reference frequency in the process of identification. The result demonstrated that the roles of 11 MMF in computer aided insect identification (CAII) is, from high to low: area>eccentricity>formfactor>perimeter> llength >Holenumber>(x length, roundness)>lobation>circularity>sphericity. According to 11 MMF, 40 species of insect which belonging to 8 Orders, 25 Families were identified through dichotomous method. And it also was the identification mechanism of CAII. Finally, the authors put forward an updated version of BugVisux and CAII software that can identify 3 species of insects, and thus enable it to identify as much as 40 species of insects with an accuracy rate as high as 97.5%.Keywords：MMF(mathematical morphological feature),CAII(computer aided insect identification),identification mechanism14|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Natural disasters are constant threat to Chinese agriculture. Therefore the accuracy of disaster forecast is of vital importance. In this paper, a chaos model for long term disaster forecast was built based on chaos theory, to provide accurate prediction for agricultural disaster by using the data of main drought forecast in Beijing. This model successfully simulated all major drought occurrences happened in Beijing in the period of 1955 to 2001, by applying three step difference equations jointly with multivariant state space equations. The accuracy of proposed model is significantly improved comparing to current statistical methods in major drought forecast. The chaos disaster forecast model provides a new approach for long term disaster forecast.Keywords：chaos theory,disaster,long term forecast model1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This paper puts forward to a model of data structure for GIS with timing dimension based on the relationship database. This model based on the OOA and OOP technology, study on the methods of history information backward and recovering. This paper shows the design of time space data model, the analysis of methods of history information backward and recovering, and some example of important programming.Keywords：GIS,timing dimension,relationship database,object oriented programming,1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The dynamics of various nitrogen forms in soil and characteristics of nitrogen utilization under application of urea and different organic materials were studied with pot experiment. The results showed that crop nitrogen uptake decreased when urea(U) applied with high C/N ratio of wheat straw(WS) and increased when urea applied with low C/N ratio of poultry manure(PM). There were no significant difference in crop biomass among U, U+WS, U+PM treatments. Urea hydrolysis and nitrification completed within 14 days. Compared with U treatment, the application of high C/N ratio of wheat straw significantly decreased amount of NH 4 N and NO 3 N in soil while the application of low C/N ratio of poultry manure increased their content, which were consistent with crop nitrogen uptake. Soil microbial biomass N also involved in nitrogen supply to crop. The utilization of earlier fixed NH + 4 by crop was weak. Soil fixed NH + 4 was increased after application of nitrogen fertilizers, and this kind of fixed NH + 4 could be uptake by crop during growth period. The order of nitrogen recovery rate by crop was: U>U+PM>U+WS.Keywords：urea,organic materials,NH 4 N,NO 3 N,soil fixed NH + 41|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of the study is to evaluate the inhibitory effect of higher concentration acetylene on soil nitrification under straw amendment. In laboratory, the soil was added with 2% C 2H 2 and urea and incubated under aerobic condition for 108 h. CO 2 and N 2O were measured periodically and soil inorganic N was analyzed at the end of incubation. In field, two percent of C 2H 2 was added into intact soil cores different in moisture and N mineralization rate. Change in soil inorganic N content of each soil core was determined after 7d incubation. Under laboratory conditions, 2% C 2H 2 can completely inhibit soil nitrification. Also, 2% C 2H 2 can inhibit the mineralization of the soil organic nitrogen by 19 2% and the respiration of soil heterotrophic microorganisms to a great exfent. Under field conditions, however, the effect of 2% C 2H 2 to inhibit nitrification of straw amended soil could not be quantified in this study. The reasons for that un success might be the large variability of soil moisture and the poor consistence between compared the soil core and the treated soil core at the beginning of each incubation. The importance of heterotrophic nitrification in straw amended soil should be concerned.Keywords：acetylene,nitrification,inhibition0|5|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To analyze nectarine cultivars from angle of molecular biology, genomic DNAs of 19 accessions of nectarine peach ( Amgdalus persica var. necturina ) were amplified by RAPD (Randomly Amplified Polymorphic DNA) with 22 primers selected from 200 arbitrary 10 decamer primers. Analyzing phylogenetic relationship through cluster of the bands of 180 amplified loci. The experimented accessions could be divided among three groups. Molecular checking index and conservation of key germplasm which included 6 cultivars named Shuguang, Ruiguang No.2, Mayfire, Aimila, Hongliguang, Armking were put forward according to special bands.Keywords：nectarine peach,RAPD,phylogenetic relationship,molecular checking index,conservation of key germplasm2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：low light intensity,cherry,fruit setting,fruit quality0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The feasibility of using the energy dispersion synchrotron radiation X ray fluorescence (SRXFA) for analyzing trace elements in tobacco protoplasts was demonstrated. Protoplasts were isolated from tobacco leaves, fixed by 3% glutaraldehyde for 30min, then put on Dular film. After drying, protoplasts were analyzed by SRXFA. Acquisition time lasting 20min, Cl, Ca, Mn, Fe, Cu, Zn, Cr, Co, Ni, As, Ge and Ti were detected in single protoplast when beam intensity was higher than 80mA; while current was lower than 80mA, only Cl, Ca, Fe, Cu, Ge and Ti could be detected. Our data show that, after protoplasts were infected by tobacco mosaic virus, the concentrations of Ca and Fe had a significant decrease compared with health protoplast, and Cl, Cu and Ge did not change.Keywords：synchrotron radiation X ray fluorescence,tobacco protoplast,tobacco mosaic virus,trace elements2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：protoplast fusion,fusion hybrids,identification,food application4|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：chicken,pulmonary,arterial smooth muscle cell,cell culture,immunohistochemistry,detection0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The purpose of this study was to induce the ventricular fibrillation(VF) and measure the ventricular fibrillation threshold(VFT)in chickens. Chickens were induced VF by the electric stimulation(ES) or KCl i.v. methods. The results were as follows: 1)in the ES method,94.71% of chickens were successfully induced ventricular fibrillation(VF), including 100% of broiler chickens and 91.87% of laying chicken. 2)By KCl,88.06% of chickens were successfully induced VF,including 88.46% in broiler chickens and 87.80% in laying chickens. It showed that: 1)both ES and KCl infusion which could induce VF in chickens;Chickens were induced VF by ES more easily than by KCl. 2)Broiler chickens were more sensitive to VF than laying chickens by both methods.Keywords：chickens,VFT,electric stimulation,KCl infusion1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：duck,cryptosporidia,pathogenicity,morphopathology3|5|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：AEV antigen,monoclonal antibody,direct dot ELISA,antigen detection2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：Eimeria tenella,maduramysin,ultra structure,mitochondrion2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
