17个小麦品种(系)幼胚脱分化特性的比较   总被引：1，自引：0，他引：1  

赵元增  李淦  李友勇  李全林 《河南科技学院学报》2007,35(3):7-9

以豫麦54、百农矮宝、周17等17个小麦品种（系）的幼胚为外植体，通过脱分化培养，以筛选出脱分化特性优良的小麦品种（系）及适宜的愈伤组织诱导培养基。结果表明：出愈率在不同小麦品种（系）间差异不大，但胚性愈伤组织发生率却存在明显的基因型效应。17个供试小麦品种（系）的出愈率变幅为82．09％-98．3％，而胚性愈伤组织发生率的变幅为5．13％-67．5％．从形成的愈伤组织质量与数量综合分析，17个小麦品种（系）中，以徐麦038，抗条温6，豫麦49三个品种（系）的脱分化特性较好。  相似文献   

单体型装配问题的研究现状     

杨英杰 《铜仁学院学报》2011,13(2):135-138

单核苷酸多态性（SNP）是指不同个体DNA序列上的单个碱基的差异,是人类基因组中最丰富的遗传变异。单体型是指位于一条染色体上或某一区域的一组相关联的SNP等位基因。研究表明在复杂性疾病研究方面,由多个变异位点组合构成的单体型所携带的信息比单个的SNP数据的信息更有价值,由此衍生了单体型装配问题。文章论述了SNP,单体型,基因型的定义,综述了求解单一个体单体型装配问题的主要模型及算法,同时阐述了求解群体单体型装配问题的5种方法及算法。  相似文献   

自交群体基因型纯合过程中的一个定理     

陈奇 《柳州职业技术学院学报》2012,12(4):36-38

用差分方程组建立基于适合度的自交群体基N型比例模型，证明了反映三种基因型RR，Rr，rr比例的逐代变化的一个定理。  相似文献   

模因论对大学英语四六级写作教学的启示     

陈娴 《台州学院学报》2014,(1):47-50

模因论反映了语言的进化规律,模因的特点是通过模仿而传播,为外语教学提供了新的视角。基因型和表现型模因应用于大学英语四六级写作教学中,体现出背诵、仿写及联想是提高大学生英语写作水平的有效途径,有助于提高英语写作教学效果,加强学生的英语写作创新能力。  相似文献   

Characterization of (68)Zn uptake, translocation, and accumulation into developing grains and young leaves of high Zn-density rice genotype     

Wu CY  Feng Y  Shohag MJ  Lu LL  Wei YY  Gao C  Yang XE 《Journal of Zhejiang University. Science. B》2011,12(5):408-418

Zinc (Zn) is an essential micronutrient for humans, but Zn deficiency has become serious as equally as iron (Fe) and vitamin A deficiencies nowadays. Selection and breeding of high Zn-density crops is a suitable, cost-effective, and sustainable way to improve human health. However, the mechanism of high Zn density in rice grain is not fully understood, especially how Zn transports from soil to grains. Hydroponics experiments were carried out to compare Zn uptake and distribution in two different Zn-density rice genotypes using stable isotope technique. At seedling stage, IR68144 showed higher ⁶⁸Zn uptake and transport rate to the shoot for the short-term, but no significant difference was observed in both genotypes for the long-term. Zn in xylem sap of IR68144 was consistently higher, and IR68144 exhibited higher Zn absorption ratio than IR64 at sufficient (2.0 μmol/L) or surplus (8.0 μmol/L) Zn supply level. IR64 and IR68144 showed similar patterns of ⁶⁸Zn accumulation in new leaves at seedling stage and in developing grains at ripening stage, whereas ⁶⁸Zn in new leaves and grains of IR68144 was consistently higher. These results suggested that a rapid root-to-shoot translocation and enhanced xylem loading capacity may be the crucial processes for high Zn density in rice grains.  相似文献   

The polygenic profile of Russian football players     

Emiliya S. Egorova  Alyona V. Borisova  Leysan J. Mustafina  Alina A. Arkhipova  Rashid T. Gabbasov  Anastasiya M. Druzhevskaya 《Journal of sports sciences》2014,32(13):1286-1293

Abstract

Research concerned with predictors of talent in football has highlighted a number of potentially important and partially inherited measures such as body size, anaerobic power, aerobic capacity, agility, psychological profile, game intelligence and susceptibility to injuries. Genotyping for performance-associated DNA polymorphisms at an early age could be useful in predicting later success in football. The aim of the study was to investigate individually and in combination the association of common gene polymorphisms with football player’s status. A total of 246 Russian football players and 872 controls were genotyped for 8 gene polymorphisms, which were previously reported to be associated with athlete status. Four alleles (ACE D, ACTN3 Arg577, PPARA rs4253778 C and UCP2 55Val) were first identified, showing discrete associations with football player’s status. Next, we determined the total genotype score (TGS, from the accumulated combination of the 4 polymorphisms, with a maximum value of 100 for the theoretically optimal polygenic score) in athletes and controls. The mean TGS was significantly higher in football players (52.0 (17.6) vs. 41.3 (15.5); P < 0.0001) than in controls. These data suggest that the likelihood of becoming a football player depends on the carriage of a high number of “favourable” gene variants.  相似文献   

自异混交群体基因型熵变中关于自交率的数学命题     

陈奇 《柳州职业技术学院学报》2013,13(1):50-52

从数学角度研究自异混交群体的基因型比例的逐代演变规律中自交率这个参数对Fn的基因型之比及熵的影响程度,归结为几个数学命题,并论证。  相似文献   

基因选择模型正周期解的存在性     

向红军  王金华 《怀化学院学报》2007,26(2):9-12

利用Mawhin重合度理论研究了一类基因选择模型:xn 1=(xnexp[βn(1-αxn-k)])/(1-xn xnexp[βn(1-αxn-k)]), n=0,1,2,…正周期解的存在性,获得了该差分系统存在正周期解的新的充分条件.  相似文献   

桑树的种质资源、生态适应性及其应用前景   总被引：13，自引：0，他引：13  

姚芳  倪吾钟  杨肖娥 《科技通报》2004,20(4):289-292,297

阐述了我国桑树种质资源的分布情况及其抗逆性和生态适应性,主要包括：耐寒性、耐渍性、抗旱性和抗污染及抗病虫害特性等．并以其生态适应性为基础,探讨了其在生态环境建设中韵潜力,以期为进一步拓展桑树资源的综合利用提供参考依据。  相似文献   

植物氮、磷、钾营养基因型差异的研究进展     

郝会军  刘英  王洪波 《潍坊高等职业教育》2006,(3)

植物基因型差异已成为植物营养学研究的一个重要领域。本文综述了植物适应氮、磷、钾营养的基因型差异的研究进展,对深入研究这方面的理论和应用研究都具有重要的意义。  相似文献