Genomic and genic sequence variation in synthetic hexaploid wheat （AABBDD） as compared to their parental species

In order to understand the genomic changes during the evolution of hexaploid wheat, two sets of synthetic hexaploid wheat from hybridization between maternal tetraploid wheat （AABB） and paternal diploid goat grass （DD） were used for DNA-AFLP and single strand conformation polymorphism （SSCP） analysis to determine the genomic and genic variation in the synthetic hexaploid wheat. Results indicated that more DNA sequences from paternal diploid species were eliminated in the synthetic hexaploid wheat than from maternal tetraploid wheat, suggesting that genome from parental species of lower ploidity tends to be eliminated preferentially. However, sequence variation detected by SSCP procedure was much lower than those detected by DNA-AFLP, which indicated that much less variation in the genic regions occurred in the synthetic hexaploid wheat, and sequence variations detected by DNA-AFLP could be derived mostly from non-coding regions and repetitive sequences. Our results also indicated that sequence variation in 4 genes can be detected in hybrid F1, which suggested that this type of sequence variation could be resulted from distant hybridization. It was interesting to note that 3 out of the 4 genes were mapped and clustered on the long arm of chromosome 2D, which indicated that variation in genic sequences in synthetic hexaploid wheat might not be a randomized process.     

高产优质专用小麦新品种临麦6号

临麦6号为临沧市农技推广中心麦类课题组，于1995年用86鉴22作母本，84-346作父本经人工杂交选育而成。育种编号96鉴21，2003年通过云南省品种审定委员会审定。同意进行登记，命名为临麦6号。2004年获云南省农业厅推广成果二等奖。     

化学采油数值模拟的杂交元方法

一、引言 为提高油藏的采收率,化学采油是一种重要的开采技术。向油藏中注入表面活性剂、醇类、聚合物等化学溶液,引发各种化学物理的复杂反应,而产生驱油作用。描述这种多相多组分混合胶束聚合物渗流的数学模型为     

赵惠恩：第一株自然悬垂的菊花

通过野生种作属间杂交培育菊花新种要多长时间？赵惠恩的预期是5～10年，也就是说从2005年在太行山挖回遗传资源开始计时，新品种可能出现在2010年后。然而研究进展却出乎意料地顺利，第一个自然悬垂的悬崖菊新品种——“太行之银河”在2008年开花了。     

时事·商务部

1．日前，商务部在湖南长沙举行授牌仪式，将我国首个援外培训基地即“中国杂交水稻技术援外培训基地”授予袁隆平农业高科技股份有限公司。商务部副部长傅自应为基地授牌，湖南省副省长刘力伟及湖南省政协副主席、中国工程院院士袁隆平出席授牌仪式。     

南京林业大学科技成果简介：（一）鹅掌楸属种间杂交技术及杂种优势的研究

杂交鹅掌楸具速生、抗逆性强、叶大而形奇特、花色艳丽、凋落物无污染、几乎无病虫害等特点。其每年大量的纸质落叶对林地土壤培肥作用显著，已成为我国山地栽培首选树种，其竞争地位是其他树种所无法取代的，已被确认为我国重点推广的胶合板和纸浆材及观赏用的重要树种。目前其种苗市场的供需一直处于供不应求的状况。     

杂交中稻超多蘖壮秧超稀栽培关键技术问题探讨

以多年试验资料，四川盆地两熟制杂交中稻“超我蘖壮秧超稀栽培模式”中几个关着急技术２问题进行了探讨，明确了两熟制杂交中稻超稀栽培必须以培育“超多蘖壮秧”为基础，而培育超多蘖壮秧的技术核又在于保证秧苗在秧田阶段具有足够的单株营养面积，在培育超多蘖壮秧的基础上，大田穴数可由常规的２２．５万－３０．０万穴     

秦油2号与中油821生物学特性及籽粒营养物质积累研究

对杂交油菜秦油２号与普通油菜中油８２１的生物学特性，籽粒成熟期营养物质的积累进行了对比研究，结果表明，杂交油菜秦油２号具有明显的营养生长和产量优势，与ｃｋ相比增产１８．３５％。但芥酸与硫代葡萄糖甙的含量比ｃｋ高，必需脂肪酸及含油量比ｃｋ低，其品质有待进一步改善。