Abstract:The recombinant transfer plasmids pSXIVVI +X3 S1.Holte and pSXIVVI +X3/4 S1.Holte and pAcGHLT C S1.Holte were constructed by insertion of the cDNA of the S1 gene of avian infectious bronchitis virus (IBV) into transfer vector plasmids pSXIVVI +X3 and pSXIVVI +X3/4 and pAcGHLT C.

Abstract:用乳化溶剂挥发法制备了伊维菌素聚乳酸微球。试验采用Ｌ１８（３＾７）正交设计，以微球粒径分布为主要优选水平，结合微球收率和包裹率，筛选出最佳制备条件：连续相为２０ｇ．Ｌ＾－１的聚乙烯醇（ＰＶＡ）水溶液；分散相为ＰＬＡ（Ｍｒ８．２万，投量２．０ｇ）和ＩＶＭ原料药（０．６７或１．００ｇ）溶于２５ｍＬ二氯甲烷；搅拌速度为４５０ｒ．ｍｉｎ＾－１，在３７℃恒温下搅拌１２ｈ挥干二氯甲烷，过滤收集微球。所得微球干

Abstract:猪等孢球虫能致仔猪球虫病，接种２０万孢子化卵囊后３ｄ出现腹泻，第４ｄ水泻，仔猪脱水消瘦，死亡率１５％，接种后５ｄ排卵囊，持续５ｄ，显微病变见肠绒毛萎缩，局部粘膜糜烂与溃疡，并出现纤维素性坏死性肠炎，猪等胞球虫的发育史包括２代无性生殖和１代有性生殖，多寄生于空肠，回肠，感染后３６ｈ出现第１代裂殖体，８４ｈ出现第２代裂殖体。有性阶段出现在感染后９６ｈ，１０８ｈ出现未成熟卵囊，１２０ｈ结肠粪中检出卵囊。

Abstract:广东苦瓜枯萎病近几年来发生较普遍，一些地块较重，研究结果如下：（１）广东苦瓜枯萎病由尖镰孢（Ｆｕｓａｒｉｕｍ ｏｘｙｓｐｏｒｕｍ Ｓｃｈｌ）侵染引起，经５科１５种不同属植物接种的专化型研究证明是尖镰孢苦瓜专化型（Ｆｕｓａｒｉｕｍ ｏｘｙｓｐｏｒｕｍ ｆ．ｓｐ．ｍｏｍｏｄｉｃａｅ Ｓｕｎ ＆ Ｈｕａｎｇ），与台湾１９８１年首次报道一致。此外，还发现该菌侵染瓠瓜（Ｌａｇｅｎａｒｉａ ｖｕｌｇａｒｉｓ

Abstract:Two pathogens were isolated from root rot of kiwifruit in Heping county, Guangdong Province. According to their cultural characters and morphology, they were identified as Phytophthora cinnamomi Rands ( mating type A1 )and Fusarium solani (Mart.) Sacc.. By artificial inoculation in greenhouse, it was showed that P.cinnamomi possessed higher pathogenicity, and F.solani was the second invader which could not attack the kiwifruit alone, but might accelerate the root rot together with P.cinnamomi.

Abstract:The effects of the heat stable substance excreted by a virulent strain of Pseudomonas solanacearum on tissue cultures of tomatoes were studied.The results showed that there existed a kind of toxic component in the plateoculture filtrate(PCF),which was demonstrated to be neither enzymes nor extracellular polysaccharide (EPS). This substance was toxic to the differentiation of tomato leaf discs and the rooting of shoots,while EPS had not such effect.

Abstract:The larvae of Liriomyza sativae Blanchard leafmining activity and its instar distinguishing were studied in this paper. The results indicated that, 1) larval instar could be distinguished from the length of cephalopharyngeal skeleton; 2) the mean mine lengths mined by the larvae showed significantly differences under various temperatures treated , no significant differences were observed on its mean mine area; 3) both mean mine length and mean mine area mined by the larvae were changable with their host plants; 4) the third instar larvae was the main one of larvae to damage, its mean mine area occupied over 82% of total larval infestation, and 5)using the mine length mined by the larvae could conveniently determine the instar sizes. The relationships between the mine length mined and instar sizes at various common host plants were described in the paper.

Abstract:Six important genera of plant parasitic nematodes were found in three banana plantation Yunnan Province.They are Meloidogyne incognita , Helicotylenchus, Tylenchorhynchus, Hoplolaimus, Trichodorus and Hemicriconemoides. The genera Meloidogyne, Hoplolaimus and Tylenchorhynchus were found widely distributed in three plantations. M.incognita was a predominant species and present in the highest population density, occupying 63.88% of the total population in annual banana plantation, 75.16% in biennial banana plantation, and 52.15% in perennial banana plantation. Further studies indicated that M.incognita had distinctly seasonal fluctuation. It suggested that the population fluctuation was closely correlated with the average month temperature and rainfall.

Abstract:１９９４－１９９７年对深圳宝安，龙岗两区１９镇及特区内设施栽培和露地３０多种蔬菜病害进行了调查研究。共鉴定真菌病害５１种，细菌病害（含ＭＬＯ）１１种，病毒病害５种，线虫病害１种，主要病害有２４种，另有５种非侵染性病害。其中黄瓜灰霉病，苋菜白锈病，甜椒白粉病及芫荽镰刀菌枯萎病在广东省未见报道，并对其分布，发生，为害，注行规律及防治进行了初步研究。

Abstract:In China, many methods have been tried and used in the prevention and control of the termites in dams. Five widely-used methods of prevent and control of termites in dams were introduced in the paper. By analysing and comparing their effects it showed that every method had its strong and weak points, and the method of Three Processes-Eight Steps was the most effective for the elimination of termites in dams.

Abstract:研究表明转ｍＭＴ－Ｉ基因Ｆ３代烟草金属结合特性有以下４点；①单元素处理转基因烟草元素吸收量远远大于多元素处理，并且比对照烟草能结合更多的金属；②混合元素处理的方差分析结果显示，转基因烟草根及茎叶中的Ｃｄ，Ｚｎ和Ｃｕ含量均比对照烟草高，以Ｃｄ的吸收最显著；③在酸性土壤中，转基因烟草吸收Ｃｄ，Ｚｎ的量大于碱性土壤，Ｃｕ则相反，在中性土壤中吸收量最高；④转基因烟草结合金属的量随ＭＴ含量的增高而增加。

Abstract:Seven early indica rice varieteies cultivatied in Guangdong were selected as parents, making twelve pairs of reciprocal combinations, to determine the relative content of the pI (isoelectricpoint) range protein components of the highest nutrition based on the isoelectrofocusing-polyacrylamide gel electrophoresis (IEF-PAGE) separation and the quantity fixed according to the scan, in an attempt to find out the parent-descendant (F 1) relationship in the relative content by statistics. The result indicated that there was a significantly positive correlation between parents and their next generation which was more closely related to the female parent than to the male parent. The result with the study method has important significance in the nutrition quality breeding of rice proteins.

Abstract:比较了青花菜不同外植体对分化不定芽的影响，结果表明，在ＭＳ添加吲哚乙酸（ＩＡＡ）１．０ｍｇ／Ｌ和６－苄基腺嘌呤（ＢＡ）２．０ｍｇ／Ｌ培养基上，子叶，下胚轴，花序柄及花蕾的不定芽分化率分别为５０％，１００％〉１４％和７３％，在各种外植体所分化形成的不定芽中，除花蕾所分化的不定芽有７４％表现正常外，其余的不定芽几乎玻璃要。与此同时，以下胚轴作为外植体，探讨玻璃苗抑制途径的初步结果显示，提高培养基琼脂质

Abstract:During the vase-holding life of cut Hedychium coronarium spike , the dry weight of flowerets and their contents of soluble protein and soluble carbohydrate increased at first and decreased after full bloom. The activities of SOD,CAT,POD decreased at first and then increased ,the activity of SOD peaking in the fully bloom floweret, while the activities of CAT,POD reached peaks at a relatively later time when the flowerets began to bend. The content of MDA increased all the time, but increased significantly only at the later period when the activities of SOD,CAT,POD began to decrease again. The plasma membrane permeability was stable at first and increased sharply after full bloom when the content of MDA accumulated to a high level. These indicated that disorder of active oxygen metabolism was probably responsible for the senescence of cut H. coronarium spike during the vase-holding life.

Abstract:The results of this investigation indicated that peroxidase activities were very different both among the different organs in the same variety and among the same organs of different varieties in 6 sugarcane cultivars,i.e. Yuenong 76/169,Q75,Guitang NO.1,Fuzhe 77/3003,India CO 331,and POJ 2878.In the blades, petioles, stem tips, mature stems, and roots, the numbers of isoperoxidases were significantly different both among the organs of the same variety and among the same organs of different varieties.

Abstract:The study was aimed at the effect of storage under high temperatures on the peroxide of membrane lipid and permeability of both peel and pulp of banana fruit. It was demonstrated that the overall tendencies were as follows: high temperatures speeded up the peroxide of membrane lipid. The contents of MDA and the cell permeability of both peel and pulp were increased. The pulp was more sensitive to the high temperatures than the peel. The treatment with ethylene absorbent in MA storage significantly delayed the time that the MDA contents and cell permeability increased. The ethylene absorbent significantly increased storage life of banana under high temperatures.

Abstract:Studies were made in the morphology of seedling, the peroxidase isozyme patterns of dormant seed and stem of seedling, the fruiting rate of cross, geographic and biological characteristics in cole crops. Coupled with the earlier studies, it was concluded that it was more reasonable to treat Chinese kale as a separate species. Amendment to the key to cole crops was also put forward.

Abstract:研究了广州地区早稻２个稻种（．Ａ粳籼８９；Ｂ，汕优６３）在２种施肥处理（１．有机肥＋化肥；２．化肥）下，各个试区的甲烷排放通量与排放规律。研究表明：“粳籼８９”在处理１和处理的ＣＨ４排放通量分别为８．１和１．２ｍｇ／（ｍ＾２．ｈ）；“汕优６３”在处理１和处理的ＣＨ４排放量通量分别为４．６和２．５ｍｇ／（ｍ＾２．ｈ）．２个稻种在同种施肥及常规间歇灌溉管理条件下，ＣＨ４排放通量有一定差异。在施肥处理１

Abstract:A law of extracting efficiency was put forward according to the law of distribution, and demonstrated with limitation regulation and Lagrange's middle value theorem.

Abstract:The author generalized the results of the centralizer of matrix over complex number field to Real Quaternion field.

Abstract:Terpenoids which widely exists in the higher plants is one of the metabolite of plants, and it plays a important role in the ecological systems. The relationship between the allelopathic effects and the community succession was reviewed. In this paper some subjects such as the bio synthesis of terpenoids, main plant species containing terpenoids, major compounds of terpenoids, ways of the terpenoids entering into environment and their water solubility were discussed. It was also expounded that the terpenoids can cause inhibition, promotion and autotoxic action on seed germination and seedling growth. The factors affacting these effects were also discussed.

Abstract:The progresses in the studies of nematophagous fungi,including their nutrition,the factors affecting their activities and the ways to increase their efficacy in the management of nematodes were introduced in the paper.In addition,the ways of nematophagous fungi attacking nematodes were reviewed.The development trends of the studies of nematophagous fungi were also discussed.

Abstract:This article reviewed physiological and biochemical response of plant to nutrient stress,especially to P deficient stress ,such as root morphological and metabolic changes, root specific excretion,carbohydrate assimilation changes,specific protein production and plant hormone and polyamine changes etc.