Abstract:家蚕在胚胎发育期间，对３０℃相对湿度６０％的催青条件，品种间表现了不同的耐受性能力，耐受性能力强的品种，其孵化率为９１．２％，弱的孵化率为２４．０８％，耐受性是属于一种遗传性状，普通蚕与催青热敏感性蚕品种杂交，其Ｆ１代杂种的蚕卵，用高温干燥条件催青，可控制雄蚕的孵化率在９０％以上，而雌蛋的孵化率在９％以内，在高温的环境中，雌胚子较雄胚子对干燥敏感，雌胚子虽可发育至转青期，但几乎不能孵化，部分胚子形

Abstract:以典型的顽拗性黄皮（Ｃｌａｕｓｅｎａｌａｎｓｉｕｍ）为材料，研究了其种子保湿贮藏及胚轴的超低温保存，结果表明：部分脱水的生理成熟期种子，每１００ｇ种子混入４～６ｇ百菌清贮于１５℃，超过８００ｄ后仍保持较高的发芽率及种子活力，经梯度蔗糖，梯度蔗糖加脱落酸（Ａｂｓｃｉｓｉｃａｃｉｄ，ＡＢＡ）及１１０ｇ／Ｌ蔗糖（ＳｕｃｃｒｏｓｅＳｕｃ蔗糖）＋２０μｍｏｌ／ＬＡＢＡ预培养的生理成熟期胚轴，脱水８～１０ｈ后

Abstract:s With litchi( Litchi chinensis Sonn. cv. Huaizhi) as material, changes of polyphenol oxidase and peroxidase activities and their isozymes and the relation of these to the litchi pericarp browning during storage were studied. The results indicated that, the polyphenol oxidase and peroxidase in litchi pericarp had two forms, free form and bound form. Their activities all changed during cold storage, and some new isozymes bands of polyphenol oxidase and peroxidase appeared along with litchi pericarp browning. There is some relation between these two enzymes and the litchi pericarp browning.

Abstract:在水培和人工气候条件下，用７种浓度的ＮａＣｌ分别对３个耐盐力不同的品种的４周龄秧苗处理２周以考察盐浓度与水稻苗期耐盐指标表型变异的关系，结果表明：除根部Ｃｌ＾－含量外其余指标都有一个适于产生最大变异的盐胁迫范围，根据这一范围的不同，初步将苗期耐盐指标分成适于低，中和较高盐胁迫３类，只有根据度量指标选用相应盐处理浓度，才有可能充分估计出耐盐性遗传变异。

Abstract:Yi-DS is a specialized rice as short photoperiod low temperature induced male sterile, and as long photoperiod high temperature induced male fertile. It expressed characters between indica and japonica, genetic complexity and more generation for transferring a sterile line. In the area of South China, seed production of hybrid rice is divided into first-crop (early) season and second-crop (late) season. This speciality may prevent a sterile line from transformation of male sterility caused by cold current (low temperature) at the booting stage, and therefore success the seed production. The practical use of this germplasm may develop a change in two-line hybrid rice breeding in South China.

Abstract:Effects of mixture planting symbiosis on yield of 13 mixture planting symbioic colonies(named:mixture line rice) which were mixed by each two of 7 two-line hybrid rices were studied.The results showed the yield of most mixture-line rices lied between two reference combination's yield, but some significantly increased comparing with the reference combination's. It indicated that mixture planting symbiosis in the same crop existed supplementary effects or inhibited effects. As for its law, it was necessary to be further studied, in order to providing a theoretical basis for utilization in production.

Abstract:１９９６年早晚两季采用两个水稻品种试验比较了不同施氮水平下水育秧和旱育秧的产量及产量构成差异，统计分析表明，旱育秧比水育秧每公顷增产稻谷２９３．０～７２９．０ｋｇ增产幅度为４．９％～１２．６％，增产的主要原因是单位面积有效穗数显著增加，在旱育稀植条件下，植株高度明显增高，有效分蘖提前结束，但其他产量性状未见明显增长。

Abstract:Bioassay of the extract partitioned with chloroform from the foliar methanol extract of Aglaia odorata var. chaudocensis (Meliaceae) for insecticidal effects on the imported cabbage worm, Pieris rapae, were carried out. The results showed that the extract possessed high effects of growth inhibithion and stomach poison. Insects fed with the contaminated leaves with 10 g/L extract obtained 96.3% mortality and 22.5% growth ratio on the 7th and the 5th day, respectively after treatment. However, the less effects were showed on antifeeding and contacting poioson. Compared with Toosendanin and Neem oil, the succeessful botanical insecticides, the effects of the extract on stomach poison and growth inhibition were similar to those of Neem oil.

Abstract:以广州，深圳种植的几种主要十字花科蔬菜，研究了小菜蛾对寄主的选择性，室内试验和田间调查结果基本一致，小菜蛾对芥菜，菜心的嗜好性最大，对萝卜，白菜次之，对芥蓝，花椰菜最差，根据小菜蛾喜受在芥菜上产卵这一特性，进行了芥菜与芥蓝套种诱集防治小菜蛾的田间试验，结果表明，所有套种田中芥蓝上的小菜蛾卵数量都显著低于单种田（Ｐ〈０．０５），在芥蓝生长后期，单种田芥蓝中卵数量高出套田近１０倍，芥菜中数量是芥蓝中的

Abstract:The results obtained from leaf residue bioassays showed that the 3-instar and 5-instar larvae of the imported cabbage worm eating 4 kinds of vegetables,i.e.Chinese cale ( Brassica alboglabra Bailey),Pak-choi ( B. campestris L.),Flowering Chinese cabbage ( B. campestris L.) radish ( Raphanus sativus L.),had remarkably varied susceptibility to RH-5849, and the highest ratios of the LC 50 were 1.61 times for 3-instar larvae and 1.92 times 5-instar larvae. But after feeding on Flowering Chinese cabbage for a generation,the variation became less,and the highest ratios of the LC 50 were 1 22 times for 3-instar larvae and 1.15 times for 5-instar larvae respectively.

Abstract:Aromatic components of Kodingch ( Ilex kodingcha Tsang) were analysed by applying steam distillation extraction GC,GC/MS and other methods. In one hundred and forty-six separated peaks, Ninety-one constituents were identified. The major constituents were Hexadecanoic acid, 9,12-Octadecaiendoic acid (Z,Z)-,1,2-Benzenedicarhboxylic acid,diisooctyl ester,1,2-Benzenedicarboxylic acid bis(1-methy-hepty1) ester,Di-N-octy1 Phthalate, Cyclohexene 1-methy1-etheny1)-,Butylated hydroxytoluene and 2-Coumaranone, respectively.

Abstract:Two new genera of Orchidaceaearedescribed: Luiguishania Liu et Zhang from Taiwan,China and Wutongshania Liu et Zhang from Guangdong,China.

Abstract:For a progeny test, when analysis of variance is undertaken and heritabilities are calculated with plot means, the results of single tree heritability are not desirable. However, if carrying a plot means based analysis of variance with the within plot variances and the harmonic means of number of individuals per plot to be calculated separately, and then estimating the variance components and heritabilities, the results are similar to those which are estimated with individual observations even when the data set is of seriouse unbalance. A lot of computer resource and time can be saved under plot means based estimation. The data set from a field experiment was collected to show the detail method and process of this kind of analysis.

Abstract:总结了６个测验年度，５～８年的１４９个火炬松的自由授粉家系测验结果，表明家系间材质生长有显著差异，按水平表现法得５０分以上的系占４６％，它们的材积增益平均为１１．３％，按选择目的，用途及测验持续时间长短，将它们分为４组，结果还表明，不同来源的家系群优秀率不同，中选家系均优于任一对照，有力地说明选择改良的有效性。

Abstract:In order to study the environmental effect of brickfied fluorine pollution on agricultural ecology, we conducted systematic research by means of environment monitoring and agricultural ecology methods . The results indicated that atmosphere and soil and crops surrounding the brickfields had been pollutied by Fluorine to some degrees.The fluorine concentration of surrouding crops growing in brickield discharge area was higher than that of control samples. The death rate of domestic(chicken), were clearly higher than that before the brickfield went into operation.So we suggested when a brickfield goes into operation, the problems of environmenal pollution should be given adeqvate attention.

Abstract:A Mix Method which combined the Iterative Method with the Displacement Method is described in this paper. The Mix Method excels at calculating frames whose nodes have horizontal and vertical displacements. An engineering case, the Sihui City Daxingwei First Electromatic Drive Station which was calculated by this method and has been built, is also specified in the paper.

Abstract:DNA vaccine,a new and unusual approach for evoking an immune response,was introduced and the advantages and general procedore for DNA vaccination reviewed. The authors suggested that DNA vaccine be applied to control poultry diseases.

Abstract:This article reviews the classification and molecular structure of pentosans, the relationship between the content of pentosans in flour and the quality of flour. The mechanisms of pentosan actions on dough formation and air conservation in breads also discussed.