Abstract:Sterility of PTGMRS deriving from Nongken 58S germplasm and 5460S germplasm was governed by two pairs of recessive genes, but that of Annong S-1 governed by a couple of recessive major genes. An allelism test involving five PTGMRS revealed that Nongken 58S and W6154S, Nongken 58S and W7415S, Nongken 58S and 5460S, W6154S and Annong S-1, W6154S and 5460S possessed partially identical photo-thermo sensitive sterile genes; Nongken 58S and Annong S-1, W6154S and W7415S, W7415S and Annong S-1, W7415S and 5460S, Annong S-1 and 5460S had different photo-thermo sensitive sterile genes.

Abstract:通过连续３年对射线诱变的７４株沙田柚９３８个单位枝的花粉预选及果实鉴定，初选出１２个少核枝和８个较少核枝，其中综合性状突出的有７个，研究结果表明，激光和＾６０Ｃｏ的诱变效果优于快中子，都得到了较多的少（较少）核枝和较高的花粉败育型频率（６．４８％和６．１２％）。以醋酸洋红染色法对１５个少核枝进行的花粉育性检测表明，绝大多数少核枝的花粉败育率都高于４５％（对照为１２．２０％￣１３．４６％），故初步确

Abstract:Based on the ecological,physiognomic and structural features of the communities in Baiyunshan Scenic Spot,Guangzhou, and coupled with clustering analysis and ordination analysis methods,the characteristics of the vegetation are analyzed and types of the communities are classified. The vegetation of Baiyunshan Scenic Spot can be divided into 3 vegetation type groups,3 vegetation types,12 formations and finally 29 associations.

Abstract:A study on the effects of minimal inhibitory concentration of several antibiotics, including Gentamicin, Streptomycin, Ribostamycin Sulfate, and Sagamicin Sulfate, on pollution microbes of L-malic acid was conducted in this paper. The experiment of the simulation ferment process with the same temperature, pH value and ventilation conditions in vibration culture with twice pollution microbes was carried out added and the results were validated by agar plate culture. It was showed that Gentamicin had the strongest inhibitory effectiveness and Sagamicin Sulfate the second. The minimal inhibitory concentration of Gentamicin was 0.4 mg/L, and after twice pollution microbes added, the effective concentration was 0.8 mg/L. The result was used for the ferment processing practically with the fermentation tanks of 240 and 1700 L, and proved to be valid for L-malic acid fermentation.

Abstract:详细描述了海南根结线虫胚胎发育和胚后发育各阶段的过程和形态变化。在平均温度２６℃时，完成胚胎发育需１４．５￣１７．５ｄ；在平均温度２５．４℃时，完成胚后发育约需３０ｄ。上述实验结果，为在海南控制水稻根结线虫病，提供了一定理论依据。

Abstract:Studied the influence of the loblolly mealybug, Oracella acuta , on the growth of the slash pine, Pinus elliottii , in Guangdong province.The damage degree of the slash pine is divided by the symptom of damaged pine.The results showed that growths of height and lateral shoots were reduced by 23.7% and 25.8% respectively in heavily damaged stands .Height growth,diameter growth at breast height,fresh weight of one year old needles,volume growth of severely damaged trees declined by 26.8%,30.3%,47.6% and 33.5% respectively. In the heavy damaged stands which have been infested by O.acuta for five years, the results showed that the volume of damaged trees dropped within five years in which the second and third year had great difference compared with the contrast, and the growth of the slash pine was less affected in the fifth year. The total volume loss of damaged stands amounted to 3 964 m 3 per hectare during the five years.

Abstract:The relations among soil enzyme activities, soil nutrition content and stand growth in a eucalypt plantation were studied. The result is as follows: Soil enzyme activities are correlated with soil nutrition content fairly, and there is certain speciality in eucalypt plantation; the volume and biomass are correlated with soil enzyme activities fairly; soil enzyme activities in eucalypt stands with pineapple are more applicable than in those with no pineapple; but the applicable range must be further investigated before soil enzyme activities are used as appraisal indicators for soil fertility in eucalypt plantation.

Abstract:It was reported that amino acid trialkyltin derivatives can be synthesized with amino acid with trialkyltin oxide and their biological activities were determined.The results of biological tests showed that these derivatives had insecticidal,fungicidal, herbicidal and plant growth hormonal activities, especially an obvious effect in fungicidal and herbicidal activities.

Abstract:以甘蓝型油菜宁油７号为材料，应用稳定性同位素＾１０Ｂ作为示踪剂，以标记硼酸饲喂油菜叶片，研究硼素在油菜幼苗体内的运围和分配。结果表明：在缺硼条件下，硼可从叶片向其它组织器官中运输，其运转比例为１．２１％￣３．２５％，大部分硼难于从叶片中运转出来，在同一张叶片内硼从叶后半向叶前半部的移动较容易，而从叶前半部向叶后半部及从左（右）向右（左）的移动较难。硼在油菜体内的分布，以叶片含量最高，根次之，茎最少

Abstract:Pot experiments were carried out to determine the effects of applying Cu,Zn to the latored soil on the growth of Chinese flowering cabbage ( Brassica parachinensis Bailey) in Qiaotou Aficultural Garden,Dongguan city. The results showed that the plant weight decreased with applying Cu and Zn to the soil simultaneously, and that the change of plant Cu or Zn content was a process combining rise with fall. Enhancing the dose of Cu or Zn separately dropped the plant weight but increased the element content in plant. Another metal content could be reduced initially and then raised.

Abstract:研究了萝卜溶菌酶对白色葡萄球菌，金黄色葡萄球菌，枯草杆等３种革兰氏阳性基本国策 和变形菌、大肠杆菌，鼠伤寒沙门氏杆菌，多杀巴斯德氏杆菌，雏白痢沙门氏菌，产气杆菌等６种革兰氏阴性菌及酿酒酵母，总状毛霉，黑根霉、黑曲霉、青霉等５种真菌的抑制效果，同时还研究了萝卜溶菌酶对白菜软腐病菌，柑橘溃疡病菌，番茄青枯病菌，水稻细条病菌，水稻白叶枯病菌及烟草青枯病菌等６种植物病原细菌的抑菌效果。实验证明：萝卜溶菌酶

Abstract:将１３日龄的石歧杂公鸡分成６组，第１组于７８日龄进行人工阉割，第２、３、４、５组分别以促性腺激素－ＢＳＡ偶联物作抗原加佛氏佐剂乳化后按不同程序免疫公鸡，第６组单以ＢＳＡ免疫作对照，结果表明：与ＢＳＡ免疫组相比，第４、５组及阉鸡组血清睾酮水平均发生显著下降，各免疫去势组公鸡睾丸，鸡冠及肉垂都有不同程度的萎缩，睾丸曲细精管发育不良或受到抑制，６０日龄免疫去势效果明显比２０及４０日龄免疫的差，以相同的抗

Abstract:用实验室￣２０℃条件下保存６年的禽成髓细胞性白血病病毒ＢＡＩ－Ａ株鸡传代血浆毒感染１￣３日龄的雏鸡，接毒后１５￣４５ｄ陆续发病。取其血浆毒，经差速离心和蔗糖密度梯度离心，获得较纯的ＡＭＶ抗原，用此抗原免疫８￣１０周龄ＢＡＬＢ／Ｃ小鼠，将其脾细胞与ＳＰ２／Ｏ瘤细胞进行融合，经ＥＬＩＳＡ筛选、克隆、共获得６株阳性杂交瘤细胞株，分别采用传染性支气管炎病毒、新城疫病毒、传染性法氏囊病毒、传染性喉气管炎病毒

Abstract:分绍用ＲＴ－ＰＣＲ（反转录－聚合酶链反应）获取禽传染性支气管炎病毒Ｍ４１株和广东地方致弱株Ｄ４１免疫原（Ｓ１）基因的详细方法，所用引物为ＩＢＶ Ｂｅａｕｄｅｔｔｅ株Ｓ１基因两侧的对应序列，跨幅为１．７ｋｂ，结果表明，两株病毒所获的ＰＣＲ产物与预期的一致；用此对引物，以ＩＢＶ Ｄ４１株Ｓ１基因ＰＣＲ产物为模板，扩增出一样的ＤＮＡ片段，试验还显示，国内外几家公司有关ＲＴ和ＰＣＲ的分子生物学试剂可以兼用

Abstract:１日龄粤黄鸡６２只，随机分为４组，第Ⅰ、Ⅱ、Ⅲ、Ⅳ组牛磺酸的添加量依次为：０，０．０５％，０．５１％，０．４５％，试验期９８ｄ，试验结果表明，第Ⅳ组鸡只性腺发育明显快于第Ｉ组，第Ⅱ、Ⅲ、Ⅳ组公鸡血浆睾酮２高于第Ｉ组，其中第Ⅳ组公鸡血浆Ｔ浓度显著高于第Ｉ组（Ｐ〈０．０１），第Ⅱ、Ⅲ、Ⅳ组母鸡雌二醇浓度高于第Ｉ组，其中第Ⅳ组与第Ｉ组比较差异显著（Ｐ〈０．０５），第Ⅳ组血浆黄体生成素（ＬＨ）浓度显著高于

Abstract:Alkaloid in Oxytropis was extracted, separated and appraised, Swainsonine was found in the alkaloid extract. Rats were fed forage mixed with oxytropis or alkaloid, two group rats became poisoned and showed similar clinical symptoms, autopsy and histopathologic changes, which indicated that the alkaloid was the principal toxin. Not only conventional H. E. staining, but also histochemical technology and transmission electron microscopy were used to observe the histopathologic changes in the poisoned rats.

Abstract:Absorption of nutrients such as NO - 3, H 2PO - 4,K +,Ca 2+ ,SO 2- 4,Mg 2+ ,Zn 2+ ,and Cl - by plants. Such as barley, wheat, rice, corn and legumes was extensively investigated. It has been tested and proved by numerous experiments that kinetic parameters ( K m, I max , C min and E ) of given nutrient ions vary greatly among species and cultivars, and are influenced by plant age and nutrient supply. It follows that the parameters are of theoretical and practical importance in studying the adaptability of root system to its environment; in evaluating and screening absorption-efficient genotypes and in predicting nutrient absorption from soil by plant root system.

Abstract:Fluorescence in situ hybridization(FISH) , characterized to be fast,sensitive,accurate and effective, is a new technique of in situ hybridization which can directly locate specific DNA or RNA sequence on chromosomes by using biotin labelling probes. This article summarized the application of fluorescence in situ hybridization in crop genetics and breeding researches,including: 1)screening repetitive DNA sequences and multicopy gene families; 2)identifing the alien chromosomes and chromosome segments in allopolyploids; 3)detecting and locating low or single copy DNA sequence. With some new techniques developed, the FISH method will play important roles in much more fields of basic and applied researches in crop genetics and breeding.