Abstract:This paper,using sevcral indices revealed the regional differences of the properties of the freezing damage to citrus various scales and analyzed the causes of each,such as biological man-made climatic and extreme minimum temperature,etc.,in detail.Many s

Abstract:以柯斯质粒ｐＬＡＦＲ１为载体先构建快生型花生根瘤菌８５－７菌株总ＤＮＡ的基因文库。在协助质粒ｐＲＫ２０１３帮助下用此基因文库分别同菌株８５－７和另一株慢生型花生根瘤菌菌株Ｃ０２－５作三亲本杂交。转移接合子接种沙培条件下生长的花生，通过结瘤试验初筛选和复筛选，共筛选出３株工程菌ＨＮ１１，ＨＮ１２（以８５－７为受体）和ＨＮ１３（以Ｃ０２－５为受体）。其每植株根瘤的固氮酶活分别比出发菌株的提高３０２％（

Abstract:用１１个母本（７个光敏核不育材料，４个常规品种）和９个具有一定广亲和性的父本配制９９个组合（按ＮＣⅡ设计），根据“程氏指数法”和超父优势指数，竞争优势（以汕优６３为对照）研究了杂种的籼粳分类特性和１２个性状的优势表现。结果表明：籼／粳杂种为偏籼（６６．６７％）和籼（３３．３３％）型，粳／籼杂种为偏籼（９１．６７％）和偏粳（８．３３％）型，籼／偏粳杂种为籼（８０％）和偏籼（２０％），粳／偏粳杂种为粳

Abstract:The resistance of six indica rice cultivars,Cuba2301.Cuba2196,Cuba4010,Shuangkang 12 to fourteen strains of Xanthomonas oryzae pv.oryzae has been analysed.It was shown that these six cultivars were resistant to twelve strains,but susceptible to Philippine

Abstract:生态核不育大麦是武汉市东西湖农科所选育的由核基因与环境条件与作而致的雄性不育材料。我们对该材料在不同播期下的育性表现及其雄性不育特征进行了研究。结果表明：生态核不育大麦选系９２１１在琥汉市正常期播种（１０月２０日）和早播（１０月１０日０条件下，表现为高度雄笥不育，不育度分别为９８．９７％和９９．９６％；晚播（１１月１９日）条件下，则表现为部分可育，结实率为４８．５２％。不育花粉可分为典败，圆败和染

Abstract:ARMA(p,q)model and periodic tendency model are used to simulate pink bollworm time series variety in a year.The result showed that the forme's sum of remainder square is 1.6901 and the latter's 0.0428.Their simulating effect is better than logistic equati

Abstract:经过调查湖北省４２个县市莴苣菌核病的发生情况，根据分离鉴定结果表明：核盘菌在调查地有发生，鄂西部分市除核盘菌之外，还存在小核盘菌，二者可能出现在同一株发病莴苣上。小核盘菌菌丝长生的最适温度２５℃，在１５－３０℃范围内，菌核产量和温度呈负相关，菌核大小同菌核产量也呈负相关。

Abstract:The water characteristics of red soils derived from five parent materials in the southeast of Hubei province were studied.The results show that:The water-holding capacity of red soils derived from quaternary red clay,argillaceous shale and arenaceous shal

Abstract:用猪消化代谢试验法，以健康的湖北白猪Ⅳ系３头，体重４５ｋｇ左右，去势后做三期试验：Ⅰ期为基础日粮试验，Ⅱ期为基础日粮＋糙米试验，Ⅲ期为基础日粮＋玉米试验，研究糙米的营养价值。试验结果：糙米和玉米的总能分别为１６７６０．６０、１６７４７．６２ｋＪ·ｋｇ~（－１），消化能、代谢能分别为１４５９４．７７±７６．２０，１３５６３．９８±１６４．１２Ｊ·ｋｇ~（－１）和１４２０５．３９±２４０．３２，１３２７２．９９±２７６．３３ｋＪ·ｋｇ~（－１）；无氮浸出物含量分别为７２．２２％和７０．１１％，其表观消化率分别为９６．７３±２．２７％和８７．２６±１．５５％；粗蛋白质含量分别为８．８０％和８．６０％，其表观消化率、表观代谢率分别为７３．７１±３．１７％、６５．０３±３．１６％和６９．１７±１．００％、５９．８９±１．５９％；氨基酸总含量分别是８．５７％、８．５６％，其平均表观消化率、表观代谢率分别是７４．４３％、７０．９７％和５９．７９％、５６．４４％。试验结果表明：糙米和玉米的营养成分含量相当，糙米各营养成分的表现消化率或表观代谢率均高于玉米，因此，用糙米作能量饲料来代替玉米喂猪是可行的。

Abstract:应用猪痢疾蜜螺旋体（Ｔ．Ｈ．）免疫血清结合葡萄球菌甲蛋白（ＳＰＡ）与Ｈ１０，２－５，Ｘ２３，Ｃ１７等Ｔ．Ｈ．菌株进行协同凝集试验，均出现明显凝集反应。而免疫血清结合不含ＳＰＡ的菌株，无特定病原（ＳＰＦ）血清结合含ＳＰＡ的菌株均无凝集反应。免疫血清结合ＳＰＡ与７种肠道菌均无凝集反应。免疫血清用量以０．２ｍｌ为合适。最低用菌量为３０倍稀释，即每个视野Ｔ．Ｈ．约４０个菌体。

Abstract:The blood of two healthy cattle which were negative to the serological examination for Babesiasis were collected by jagular venipuncture and defibernated with glass beads.Then the erythrocytes and serum of cattle were mixed with the erythrocytes and serum

Abstract:对梁子湖水生植被的种群组成、植被类型和生物量进行了初步调查。结果表明：梁子湖水生高等植物的种类为３５科６２属９２种，全湖沉水植物平均生物量为４．７５ｋｇ·ｍ~（－２）。根据梁子湖水生植物的种类组成和结构全湖分为１２个水生植物群落。梁子湖水生植被带状分布不显著，其特点是挺水植物和漂水植物未形成一个独立的植物带，沉水植物占绝对优势，分布面积接近全湖。

Abstract:The cotyledons of axenic seedlings of tomato(Lycopersicon esculentum Mill.)were cultured in vitro.Using 14-day old cotyledons with petioles as explants and a combination of Zeatin and IAA in MS basal media,about 90% of the explants produced shoots in 2 we

Abstract:Ten biological characters of Tung oil tree Vernicia fordii(Hemsl.)Airy-Shaw have been studied by meams of the principal components analysis and classification. Result manifested:The additive contributing rate of the first five principal components amounts

Abstract:Based on the survey data on the wavebreak forest in the middle reaches of the Yangtse River and the quantification model for multiple regression.the wavebreak index table was made and the quantitative evaluation for the quality of wavebreak forest was con