基于SRAP标记的玉米自交系遗传多样性与群体结构分析

利用筛选出的31对SRAP引物,对33份玉米自交系进行PCR扩增,采用PopGene 1.23、Structure2.3.3等软件完成玉米自交系遗传多样性和群体结构剖析,为自交系合理利用和杂交组配提供理论依据。结果显示,31对SRAP引物共检测出196个等位变异,平均6.32个;多态性比率40.00%~70.59%,平均为53.08%;基因多样性为0.2156~0.8854,平均为0.5495;PIC为0.1809~0.8976,平均为0.5507。结构分析表明,K=4时,△K值最大,即这些自交系可以划分成4个类群,依次为Reid、旅大红骨、塘四平头与PB群,新选自交系也相应地被划分到这四大类群里,没有独立成群。4个类群中,塘四平头群与旅大红骨群的遗传关系最近,与Reid群遗传关系最远。从系谱的亲缘关系分析,大部分已知自交系其SRAP聚类结果与系谱追踪结果有较好的一致性。     

水稻籼粳杂种一代稻米加工和外观品质性状研究

采用不同稻米品质3个粳稻和4个籼稻按完全双列模型设计进行杂交，配组了24个籼粳杂种一代F1，对其主要稻米加工和外观品质性状进行研究。加工品质中糙米率和精米率均接近粳稻品种，与籼稻无关，无胞质效应；整精米率差异很大，但大多介于籼粳双亲之间，并且随粳稻亲本不同，其胞质效应表现不一致。外现品质中垩白度和透明度，大多数介于双亲之间．而垩白率多倾向于亲本的高值。     

Genetic and genotype × environment interaction effects analysis for erucic acid content in rapeseed (Brassica napus L.)

Genetic main effects and genotype × environment (GE) interaction effects for erucic acid content (EAC) in rapeseed(Brassica napus L.) were analyzed for two year data by using the genetic models and corresponding statistical approaches for quantitative traits of diploid plant seeds. Eight parents were included in adiallel mating design in two environments. It was found that the embryo, cytoplasmic and maternal main effects and their GE interaction effects could simultaneously affect the performance of EAC, especially for the cytoplasmic and maternal effects. Since the amount of genetic main effects from the expression of genes in different genetic systems accounted for about 64.1%of the total genetic effects, EAC of rapeseed was mainly controlled by genetic main effects. The total narrow-sense heritability for EAC was 83.6% with the general heritability being 51.9% and the interaction heritability being 31.7%. It was suggested by the predicted genetic effects, that Tower and Youcai 601 were better than other parents for reducing EAC in rapeseed quality breeding. This revised version was published online in July 2006 with corrections to the Cover Date.     

高产优质番薯品种比较试验

1试验设计与经过 该试验设立在泰顺县万排乡王家洋村徐继桂承包田上.海拔为500m,前作紫云英,土质属沙性红黄壤土,肥力中上,肥力分布均匀一致,光温一致.密度:1.17m×0.36m,每小区栽插30株,折1 587株/667m2.小区面积12.64m2.参试品种5个,即:浙8678、浙1257、浙6025、浙50、瑞薯1号.以当地常规品种瑞薯1号作对照(ck),设5个小区,3次重复.采用顺序间比法排列,两头设保护行.基肥:用焦泥灰500kg/667m2,腐熟栏肥500kg/667m2,复混肥20kg/667m2.栽后用人粪150kg/667m2对水"滴口",插后22d铲草、松土,结合追肥用人肥150kg/667m2、尿素5kg/667m2对水种穴.全生育期轻提蔓2次.     

水稻白叶枯病(Xanthom onas campestris pv.oryzae)抗性遗传研究 Ⅲ.两个成株抗性基因X_a-6与X_a-3的等位性分析

研究了两个品种早生爱国3号和辛尼斯对菲律宾水稻白叶枯病菌4个生理小种、日本小种1和我国菌株的成株抗性遗传和抗性基因的等位关系。这两个抗病品种与感病品种沈农1033杂交所得的 F_1、F_2和 B_1F_1群体的成株抗性反应,表明它们均携有一对显性基因。将早生爱国3号同辛尼斯杂交进行直接等位性测定,并将邳早15和蚌珠芒分别与辛     

Improvement Methods of Fuzzy Control with Intelligent Integration

Fuzzy controller can achieve satisfactory dynamic performance even for complicated process without mathematical model of the process.Its main imperfection is the existence of steady state error and ultimate oscillatory in the process output. This limits its application area. How to eliminate the steady state error while keep its good dynamic performance has been paid much attention. The strategy to introduce integral function to the conventional fuzzy control system is put forward in this paper to overcome the above problem. After expound two key factors on introducing integral action,an intelligent integral algorithm has been employed,and two methods on introduction of the intelligent integral to the fuzzy control system are proposed. Their characteristics and applied situations are summarized.     

杨属ITS序列的分子进化特点分析

本文通过对杨属5组代表种并以柳属中旱柳的ITS序列作为参照,用成对比较的方法对杨属21个植物样品的ITS序列比较发现,杨属ITS序列的碱基替换情况是转换数大于颠换数,ITS-1序列中碱基发生转换和颠换的数目基本相似,而ITS-2序列中碱基发生转换的数目远远大于颠换。用朱克斯和坎托一参数模型和木村二参数模型对杨属ITS序列的替换率计算,无论是ITS-1还是ITS-2序列都没有达到数理统计上的明显差异。但由于ITS-2序列碱基的变化转换大大高于颠换,所以二参数模型计算所得结果大于一参数模型;采用相对速率测验法,对杨属各组分子进化相对速率进行了检测,结果分析得知,杨属5组的ITS序列分子进化速率有差异。杨属各组的ITS-1序列比较说明,大叶杨组、青杨组、黑杨组的进化速率都小于白杨组,而胡杨组则是进化速率最快的,大叶杨组的进化速率小于青杨组、胡杨组和黑杨组,黑杨组和胡杨组大于青杨组;ITS-2序列比较发现白杨组是进化速率最慢,其次是大叶杨组、青杨组,而黑杨组则稍大于胡杨组;总ITS序列比较是大叶杨组和黑杨组相对较慢,胡杨组最快;但就总的碱基替换分析,除了黑杨组和大叶杨组在ITS-1区间及青杨组、胡杨组和白杨组在ITS-2区间进化速率有显著差异外,其余组间都无显著的差异,尤其是在整个ITS序列区段碱基替换的差异都无显著差异。     

Design and Realization of Video Consultation Classroom Based on IP Network

How to make use of computer network in teaching becomes the focus of concern for the computer engineers and teachers.The remote video consultation classroom can be used in teaching by using internet and NGN server to improve the instruction and stimulate the students' interest in study.As the IP network is widely used in campus,connection could be set up for student dormitory,office or even the teacher's home.On the computer network teacher and student can discuss face to face online and make best use of their time.This paper discusses the problem about how to construct a network-video class room based on computer network including VOIP and NGN(new generation network) switch server.     

早熟硬粒型玉米自交系H21选育研究

１９７８年以来，作者坚持了以超黄早４为主要目标的早熟粒型玉米自交系选育研究，取得的主要成果为Ｈ２１。用Ｈ２１取代烟单１４号，鲁玉２号，掖单４号等组合的黄早４亲本，均比原组合表现优越，取代西玉３号中的“５０２”亲本，Ｆ１产量也有所提高，Ｈ２１选育成功的关键，一是选用中国和美国玉米品种资源来组配优缺点互补的基本材料；二是紧扣育种目标，加大选择压力，采用骨干系测交，迅速育成了超标的新杂交种。     

杂交油菜种子质量试验及分级问题探讨

对杂交油菜种子进行科学的质量分级，是当前种子生产和质量管理方面急待解决的问题，通过试验研究认为，对于育成时间短，应用面积小的杂种组合进行种子质量分级，条件尚不成熟。但对推广时间长。面积大，质量比较稳定的质不育“三系”和核不育“两系”杂交组合制定种子质量标准则是可行的。该文依据试验结果，探讨了质不育“三系”和核不育“两系”油菜杂交种种子质量的分级问题。