Abstract:By using 3 marker gene lines with different marker genes respectively located on chromosome 5,locus of one gene for photoperiodsensitive genic male sterility(PGMS)in Nongken 58s was studied through BC1F2 line analysis. Results showed that,the PGMS gene in

Abstract:以５×３不完全双列杂交法对光敏核不育水稻４个花药培养性状进行了配合力分析。结果表明，花药培养性状是可遗传的，对于愈伤组织诱导率和白苗分化率，基因的加性效应和非加性效应同等重要，而对于绿苗分化率和绿苗生长率则以加性效应为主，这２个性状的狭义遗传力均较高，通过合理配组提高花药培养能力是可能的。

Abstract:用３个抗螨海岛棉与６个感螨陆地棉亲本配制３６个Ｆ＿１代组合，根据螨害级别进行了双列杂交分析。试验中抗螨性的一般配合力方差占主导地位，亲本的抗螨水平与配合力效应十分吻合，３个海岛棉螨害轻，它们的配合力效应负值较大，陆地棉中以当地品种鄂荆１号的配合力最小。３６个组合中抗×抗和感×抗表现抗，而感×感仍表现感，其中仅１２个组合（主要为陆地棉×海岛棉）具有显著的特殊配合力效应。在本试验中，抗螨性的遗传符合加性一显性模型，以加性变异为主，广义、狭义遗传力分别为０．８８和０．７４，估计出一组显性抗螨基因。

Abstract:Under gnotobiotic conditions,the colonizaiton of Pseudomonas fluorescens(Trevisan)Migula D93 strain on wheat roots was studied by inoculating the bacterium on the roots in agar plates and pots at greenhouse,then isolating and counting with selective mediu

Abstract:在调查核盘菌和三叶草核盘菌发生为害的基础上，以核盘菌菌株Ｒａｐ－１和三叶草核盘菌菌株ＣＭＶ－２为代表，比较了温度及降雨等因子对菌丝生长及菌核萌发的影响。在１５￣２８℃下Ｒａｐ－１菌丝生长较ＣＭＶ－２快，但在８℃下则相反；Ｒａｐ－１菌核在自然条件下萌发期间的温度较ＣＭＶ－２菌核萌发时温度高，两者菌核萌发呈现出明显的先后秩序。春季降雨的波动导致２种核盘菌的菌核萌发出现波动。离体致病性测定结果表明，核盘

Abstract:Newly reported in Hongkong,the five species of the genus Helicotylenchus Steiner,1945(Nemata:Hoplolaimidae)were discribed in the paper. They are H. cavenessi,H. digonicus,H. dihystera,H. exallus and H. paraconcavus.

Abstract:Not only experiments and observations on biological and occurring charateristics of Tryporyza incertulas(Walker),but also analyses and researches on its actual incidence and damage in Hubei Province were conducted.Quanity change and damage degree of the p

Abstract:利用紫云英种子浸提物诱导紫云英根瘤菌野生型菌株７６５３Ｒ产生结瘤因子（ＮｏｄＲｈ）。根毛卷曲试验表明，ＮｏｄＲｈ能诱导产生各种形式的根毛变形、卷曲和分枝，并且能诱导形成典型的“牧羊拐”状卷曲，与菌体正常侵染所引起的变化相同。同时发现，相对较高浓度的结瘤因子ＮｏｄＲｈ能抑制根的生长，形成粗短根。在制备紫云英根瘤菌接种剂的过程中，利用种子浸提物诱导产生结瘤因子，能显著提高根瘤菌的侵染结瘤能力。

Abstract:In greenhouse-grown soybean[Glycine max(L.)Merr. cv. Aijiaozao ]supplied with different amounts of combined nitrogen(0,75,150,300 and 600 mg/pot,N as NH4NO3),the chlorophyll content of leaf discs was significantly correlated with shoot dry weight(r=0.93,P

Abstract:The immune protection for bacterial gill rot disease in mandarinfish(Siniperca chuatsi B.)was determined by immersion with the phenol inactivated Cytophaga columnaris SC-6 strain(P-CC),the lipopolysaccharide of the for going organism(LPS)and the combinati

Abstract:The fine structure of the taste organ in Sinipeca chuatsi was studied by electron microscopy. The results showed that there was synaptic contact between gustatory cells and nerve endings;the synapses of taste organ of Sinipeca chuatsi had the structural c

Abstract:对我国８家饲料厂生产的１０种鳗鱼配合饲料中的粗蛋白（ＣＰ）和必需氨基酸（ＥＡＡ）进行了测定。结果为每１００ｇ鳗料中ＣＰ和ＥＡＡ的含量（％）成鳗料分别为（４６．７０±１．６７）、（２０．３０±０．６９），幼鳗料分别为（４７．１７±１．０１）、（２０．４７±０．４７），仔鳗料分别为（５１．１０±０．１９）、（２２．２４±０．００）。方差分析表明，国产成鳗、幼鳗和仔鳗料中ＣＰ含量差异极显著（Ｐ＜０．０１），而ＥＡＡ含量差异不显著（Ｐ＞０．０５）。并且对国产鳗鱼饲料测定结果与有关指标进行了比较和讨论。

Abstract:乌鳢仔鱼的昼夜摄食节律和日摄食率的研究结果表明，乌鳢仔鱼摄食具明显昼夜节律性，其饱满指数２１时最高，１２时最低。每天在６￣１５时之间停食３ｈ左右。日摄食率随饵料密度高低而变化，饵料密度为１０￣１５个／ｍｌ、７￣８个／ｍｌ和５￣６个／ｍｌ时，日摄食率分别为１３．７１％、７．０４％和３．４９％。

Abstract:乌鳢最初出现鳞片时的全长为１９．３￣２０．６ｍｍ，日龄２０￣２２ｄ；鳞被复盖完毕时全长２９．９￣３４．１ｍｍ，日龄３５￣３９ｄ。鳞被发育过程中出现４个起始中心，第１中心为头顶部，主要中心为体侧前部，２个次要中心为鳃盖处和胸部。仔鱼体长２０ｍｍ左右鳞片上开始出现环片，全长２７ｍｍ左右出现鳞沟。仔鱼全长和鳞径、环片数之间，日龄和环片数之间均呈显著的直线相关关系。

Abstract:Adult female grass carp,Ctenopharyngodon idellus C. et V. were injected intraperitoneally with phenol-killed Cytophaga columnaris once a month for 7 months. The agglutinating antibody titers in homogenate from eggs and fry were examined.174 day-old finge

Abstract:１０年生火炬松３１个种源间木材抗弯弹性模量（ＭＯＥ）、抗弯强度（ＭＯＲ）存在着显著的差异，二者的广义遗传力分别为０．５９６７、０．６３６４。方差分析中环境方差分量所占比例较大（近５０％），说明ＭＯＥ、ＭＯＲ除受遗传上中等程度控制外，还显著受到环境条件影响。种源内ＭＯＥ、ＭＯＲ变异系数远大于种源间变异，说明火炬松材质改良在种源选择的基础上进行个体改良效果较好。各种源内ＭＯＥ，ＭＯＲ间线性相关显著，３

Abstract:An investigation of 41 typical plots with different ecological conditions,was made to study the correlation between the disease occurrence of needle-cast on Chinese fir Cunninghamia lanceolata(Lamb.)Hook.and main environmental factors such as age,density,

Abstract:The aroma constituents of roasted green tea during second drying of different temperatures were analyzed by GC and GC/MS.The results showed that the contents of aromatic alcohols and terpenols increased remarkably and contents of fatty alcohols and aldehy

Abstract:１９８７￣１９９４年春，在湖北省保康县龙坪镇山区林特气候研究中心的段木香菇试验场，对花菇等级及其所对应的气象资料（共１６个例）进行系统的分析，结果表明：空气温度在５￣１５℃，相对湿度５０％￣８０％均能形成花菇。一级花菇形成的气象条件是：平均气温在１３℃附近，最高气温２０℃，最低气温７￣８℃，平均相对湿度为６０％左右，白昼气温在１５℃以上，相对湿度４０％以下，夜间气温小于１０℃，相对湿度低于８０％，