农杆菌介导的共转化法培育无选择标记转基因水稻的研究进展

植物基因工程可有效地改良农作物的品质、性状或产量,尤其是对水稻这样重要的粮食作物,进行该方面的研究意义重大。在遗传转化过程中,抗性标记基因是筛选转化体的有效手段,但也带来了生态环境及食品安全方面的潜在隐患。为培育无选择标记转基因水稻,可采用共转化无选择标记系统,此方法简单易行,可操作性强,尤其是农杆菌介导的共转化法,应用较为广泛。同时,对获得的转基因水稻,其生物安全性也是人们普遍关注的重大问题。本文对近几年应用农杆菌介导的共转化系统培育无选择标记转基因水稻的研究进展及优化方法进行了综述,结合转基因材料安全评价标准,对转基因植物的推广及应用前景进行了展望。     

民勤绿洲边缘甘草人工栽培及产业化发展技术探讨

通过对民勤绿洲边缘甘草人工栽培的关键技术及民勤绿洲边缘甘草产业的发展现状和潜力的分析,提出了民勤绿洲边缘甘草产业化发展的技术措施和对策。民勤绿洲边缘要实现甘草产业化的快速发展需从栽培技术、产品深加工、产品质量监测、营销和技术服务等方面入手。     

生物安全性白藜芦醇合成酶表达载体的构建及水稻遗传转化

白藜芦醇是植物遭受胁迫时自身分泌的一种可抵御病菌感染的抗菌素,对真菌具有一定的抑制作用.而白藜芦醇合成酶在白藜芦醇合成途径中具有关键性的作用.水稻稻瘟病作为一种由真菌引起的严重病害,具有高发性、毁灭性的特点,对水稻品质及生产危害极大.本研究从花生中分离到白藜芦醇合酶基因PNRSC,通过基因工程的方法构建入经改造的以玉米...     

广东省甘蔗产业发展战略研究

广东省是我国甘蔗生产的主产区,是国家三大甘蔗优势区域之一,具有大力发展甘蔗产业的基础和条件。本研究利用SWOT-AHP法,从广东省甘蔗产业发展的优势、劣势、机遇和挑战等4个方面,设置了甘蔗优势区域、国内食糖需求旺盛、生产成本提高、蔗糖体制落后等20个评价指标,对广东省甘蔗产业发展战略进行分析。结果表明,广东省甘蔗产业发展应采取依靠自身优势和利用外部有利环境的SO发展战略,以实现其快速发展。     

Studies on the Mutant Systems of the Bombyx mori Gene Bank

Through over ten years of study, more than 1 000 genetic materials including mutant genes,chromosomal variation strains and special genetic materials of Bombyx mori, Linnaeus, collected, introduced or created since 1940s especially late 1980s, have been sorted out and put in order. After identifications and genetic analyses of their morphological, physiological and biochemical characters, the silkworm gene bank was constructed and the preservation system was perfected, and more than 600 silkworm strains were kept in this gene bank. The preserved silkworm mutant genes have covered more than 90% of existent ones across the world, in which, more than 100 are rare and precious mutant genes, and over 60 mutant genes were found and studied for the first time. Through hybrid analyses, linkage tests and three-point gene location tests, a perfect linkage retrieval labeling system of silkworm was established, which included 230 marker genes covering all the 28 linkage groups of Bombyx mori. The gene location system (composite system of recessive genes) of different linkage groups was set up. The intergenic complementation of mutant egg color and third type of maternal heredity egg color have been found, and indicated that the epistatic effect of mutant gene of white egg is universal. Twenty eight independent near isogenic lines murked with morphological mutation gene have been created and a series of novel breeding materials possessing great potential for application such as high feeding efficiency, special sex markers, natural colored silk, resistance to disease, wider feeding range and adjustable parthenogenesis, etc., have been developed. The sustainable maintenance and management technique system of silkworm gene resources were well established.     

家蚕近等基因系育成研究

选用家蚕分子生物学研究常用品种“大造”为轮回亲本,以家蚕实验遗传上各连锁群重要的形态性状标志基因系统为供体,培育家蚕近等基因系。通过1995年春至2000年秋连续6年的培育研究,在我国首次大批育成了包含家蚕全部连锁群各1个标志基因的近等基因系计28个。其中22个与轮回亲本交配次数在10次以上,分别为10－17次不等;余6个（均为隐性基因者）与轮回亲本交配次数达7－9次不等。利用育成的近等基因系进行RAPD分析及克隆鉴定,目前已得到8个近等基因系的目标基因的分子标记。     

Sarcomatoid renal cell carcinoma with scant epithelial components in an Angora cat

CASE HISTORY: A 6-year-old, neutered, female Angora cat presented with a history of lethargy and anorexia for 2 months and a clinically palpable and gradually enlarging, solid mass in the abdominal cavity extending from the last costal arch to the pelvic cavity.

CLINICAL FINDINGS: Examination of the cat revealed jaundice, dehydration and hypothermia. Haematological manifestations included lymphopenia and substantial decrease in haematocrit value. Biochemical analysis of the blood revealed hypoglycaemia, three-fold elevated blood urea nitrogen values, increased level of serum aspartate aminotransferase and increased total bilirubin while the creatinine level was normal. Ultrasonographic examination of the abdomen showed a disrupted and large hypoechoic area around the left kidney. The cat was anaesthetised and the left kidney was removed, but the cat died following surgery.

PATHOLOGICAL FINDINGS: On post-mortem examination, the left kidney was markedly enlarged and both the cortical and medullary parenchyma were replaced by confluent, multilobulated, pale tan-white, firm nodular masses protruding above the capsular surface. Metastasis was not observed. Cytological examination revealed a population of spindle-shaped cells of variable size, with abundant coarse chromatin and occasionally prominent nucleoli. Initial sections of the kidney were indicative of undifferentiated sarcoma confirmed by immunohistochemistry revealing vimentin-positive and cytokeratin-negative results in all tumour tissues. Additional sections showed very small amounts of both cytokeratin-positive and vimentin-positive areas.

DIAGNOSIS: Sarcomatoid renal cell carcinoma (SRCC) with scant epithelial components originating from left kidney.

CLINICAL RELEVANCE: Clinical and pathological features were similar to those of human SRCC, even though there was no evidence of metastases. Immunohistochemistry for vimentin and cytokeratin may be useful for definitive diagnosis of renal cell carcinoma with sarcomatoid differentiation, although staining of sections from several different parts of the tumour may be necessary. When a primary renal tumour is presented, SRCC should be considered as this diagnosis may influence treatment protocols and the clinical outcome.     

WW 结构域及相关蛋白在肿瘤发生中的作用

WW结构域由35～40个氨基酸残基组成,存在两个高度保守的色氨酸残基,能特异地与富含脯氨酸的蛋白基序结合。WW结构域存在于多种蛋白中,广泛参与细胞内各种生化过程和信号通路。WW结构域及其参与构成的蛋白与包括癌症在内的多种人类疾病存在密切联系,成为疾病诊断、治疗和药物开发的新靶标。本论文中,我们综述了WW结构域及其参与构成的蛋白在肿瘤和癌症发生中的重要作用和研究进展。     

Identification of Bt-transgenic Rice Plants for Resistance to Stripe Stem Borer (Chilo suppressalis) and Genetic Analysis of the Transgenes

Resistance to herbicide Basta was used to identify Bt-transgenic rice plants and the progenies of crosses between the Bt-transgenic rice and the rice varieties cultivated in the Huang Huai area of China. The results demonstrated that the Basta-positive rice plants were highly resistant to stripe stem borer (Chilo suppressalis ) both in the laboratory and field tests. Both cryIA (b) and bar genes were expressed and co-inherited in both selfing and crossing progenies. Mendelian segregation of the marker gene bar was observed in F2 and BC1 progenies. The results implicates that it is possible to transfer cryIA (b) gene into other cultivated varieties through crosses and back crosses.