13/17罗伯逊易位纯合子、杂合子猪及3个引进品种核仁组成区(Ag-NORs)的多态性

对 1 3/ 1 7易位纯合子猪、杂合子猪及杜洛克、长白、约克夏猪的核仁组成区 ( Ag-NORs)的多态性作了研究 ,结果表明 ,杜洛克、约克夏猪 Ag-NORs定位于 8号和 1 0号染色体的次缢痕区 ,而 1 3/ 1 7易位纯合子猪、1 3/ 1 7易位纯合子猪×约克夏猪 F1代 Ag-NORs的遗传方式符合孟德尔定律 ;Ag-NORs在细胞间、个体间及品种间数目均有差异 ,而且品种差异显著大于品种内个体间差异。 1 3/ 1 7易位纯合子猪、杂合子猪 ,以及长白、杜洛克、约克夏猪 Ag-NORs均数分别为 1 .99、1 .98、2 .0 0、2 .0 5、2 .0 6,说明 Ag-NORs在品种、个体及细胞间具有多态性。这种多态性与猪的起源和杂交育种时所用亲本品种的血缘成分有关 ,因此可作为遗传标记 ,用以分析家畜的亲缘关系     

关于中国发展现代农业的道路与目标任务思考

分析了中国发展现代农业面临的若干矛盾与制约因素,提出了发展现代农业始终需要坚定不移统筹处理好六大关系、实现六大统一的战略与原则,探讨了中国发展现代农业的基本目标和任务,从加强农业基础设施建设、继续推进体制创新、建立完善农民组织、加强政府支持和保护的力度、构建社会化服务体系、加大国家支持和财政投入的力度、加速集约化经营进程、优化农业内部产业结构、建设国家新型农业科技创新体系、建立新型农技推广体系、建立完善农业教育培训体系等方面详细讨论了发展现代农业的优先重点。     

试论学术期刊的经营策略

随着新闻出版和文化事业改革的不断深入,学术期刊吃皇粮旱涝保收的日子即将终结。学术期刊必须更新办刊观念,树立学术期刊也是商品的经营意识,在创造社会效益的同时,不断创造经济效益。学术期刊的社会效益与经济效益是一个有机统一体,社会效益居首位,经济效益服务于社会效益;没有经济效益,也就没有社会效益;社会效益是目的,经济效益是手段,目的通过手段实现。学术期刊的经营意识一是指学术经营意识,二是指市场经营意识。学术期刊在市场营销中的经营核心应该是追求“质量规模”,即学术质量、品牌影响带来的论文发表收入及其由此衍生的学术活动、版权合作贸易等。在经营策略上,学术期刊应当重点围绕人力资源策略、经营创新策略、市场定位策略、特色品牌策略、扩大容量策略、缩短刊期策略、以人为本策略、机制创新策略狠抓“质量规模”经营,努力提高学术期刊的核心竞争力。     

竹子悬浮细胞系的建立和组织培养试管苗移栽观察

本实验用（１）２,４－Ｄ,（２）ＮＡＡ／ＢＡ和（３）２,４－Ｄ／ＫＴ３种生长调节组合对孝顺竹顶芽和节侧芽外植体进行愈伤组织的诱导。２,４－Ｄ诱导顶芽和节侧芽外植体几乎全部生出水质、粗糙的淡黄色愈伤组织;２,４－Ｄ／ＫＴ诱导节侧芽外植体半数生颗粒状、光滑的白或淡黄色愈伤组织,不能诱导顶芽外植形成愈伤组织。由２,４－Ｄ诱导的孝顺竹愈伤组织在摇床上暗培养,建立了悬浮细胞系,可为竹子基因转化提供体材料。对     

水稻抽穗后叶色及N素含量变化同产量及食味的关系

为了解析抽穗后叶色及N素含量变化规律及其同产量、食味特性值和食味的关系,以2011年参加水稻区域试验的13个水稻品种（系）为供试材料,采用惯行法栽培管理进行了试验。抽穗至成熟期间,使用SPAD502和CCN6000 AGRIEXPERT每10天测定一次各品种（系）的叶色和N素含量;收获后各品种、重复单独测产,从重复Ⅰ中取样,使用德国生产的连续流动分析仪测定食味特性值（直链淀粉和蛋白质含量）;食味品尝试验最后进行,品尝员由16名师生参加,分2天进行。结果显示：抽穗后叶色值和N素含量呈现逐渐降低的趋势,成熟前期下降幅度较大;产量、直链淀粉含量、蛋白质含量和食味综合评价间均不存在显著的相关关系;抽穗期的叶色值和N素含量同籽粒中蛋白质含量存在显著正相关,但同产量、直链淀粉含量以及食味综合评价的相关均不显著。为此,根据抽穗期叶色值或N素含量进行低蛋白质含量品种（系）的选择是可行的。     

阳泉市雷暴气候统计特征

为了给雷电预测及防雷减灾提供科学依据,为深入了解阳泉市雷暴气候的统计特征,利用1971—2010年近40年阳泉市地面气象观测站的雷暴观测资料,借助数理统计、气候倾向率法、线性拟合、小波分析等方法,对阳泉市的雷暴气候特征进行统计分析。结果表明,阳泉市平均年雷暴日数为36.0天;雷暴日出现最多的年份出现在1973年（47天）,最少的年份在2004年（25天）;阳泉市雷暴日数月变化呈单峰抛物线型,其峰值位于7月;阳泉市平均雷暴初日为4月18日,平均雷暴终日为9月28日;阳泉市平均雷暴持续期为154天;80%保证率的出现雷暴初终日为4月中旬和10月中旬。由此得出,阳泉市雷暴发生具有明显的季节性,夏季最多,冬季无雷暴;雷暴日数呈现减少趋势。     

嘉兴市晚稻机械化插秧生产现状及发展对策

阐述了嘉兴市晚稻机械化插秧生产的发展现状,分析了影响晚稻机插生产的制约因素与存在问题,提出和探讨了加快发展嘉兴市晚稻机械化插秧生产的对策与措施。      

南疆地区引进苜蓿品种亲缘关系的过氧化物酶分析

[目的]对2012年以来引种试验的20个苜蓿(Medicago)品种的亲缘关系进行研究,为进一步开展南疆苜蓿品种遗传改良、杂交亲本选配提供依据.[方法]以8日龄幼苗和6日龄再生植株为材料,采用过氧化物酶电泳技术对供试品种的亲缘关系进行分析.[结果]20个苜蓿品种幼苗和再生植株材料过氧化物酶的多态位点百分率分别为72.73;和50.00;.供试苜蓿品种间的相似系数介于0.611 ～1.000,平均值为0.815.聚类分析在相似系数为0.776处把供试品种聚为3类,甘农1号单独聚为1类.主成分分析表明,甘农1号在分析图中的位置也相对孤立.[结论]供试苜蓿品种具有一定水平的遗传差异.甘农1号杂花苜蓿与紫花苜蓿品种间亲缘关系较远.与6日龄再生植株材料相比,8日龄幼苗材料的过氧化物酶能更有效地鉴定苜蓿材料的遗传差异.     

Identification of QTL for stalk sugar-related traits in a population of recombinant inbred lines of maize

Increasing sugar content in silage maize stalk improves its forage quality and palatability. The genetic mapping and characterization of quantitative trait loci (QTLs) is considered a valuable tool for trait enhancement, yet little information on QTL for stalk sugar content in maize has been reported. To this end, we investigated QTLs associated with stalk sugar traits including Brix, plant height (PHT), three ear leaves area (TELA), and days to silking (DTS) in two environments using a population of 202 recombinant inbred lines from a cross between YXD053, which has a high stalk sugar content, and Y6-1, which has a low stalk sugar content. A genetic map with 180 SSR and 10 AFLP markers was constructed, which spanned 1,648.6 cM of the maize genome with an average marker distance of 8.68 cM, and QTLs were detected using composite interval mapping. Seven QTLs controlling Brix were mapped on chromosomes 1, 2, 6 and 9 in the combined environments. These QTLs could explain 2.69–13.08 % of the phenotypic variance. One major QTL for Brix on chromosome 2 located between the markers bnlg1909 and umc1635 explained 13.08 % of the phenotypic variance. Y6-1 also contributed QTL allele for increased Brix on chromosome 6. One major QTLs controlling PHT on chromosome 1 and TELA on chromosome 4 were also identified and accounted for 13.68 and 12.49 % of the phenotypic variance, respectively. QTL alleles for increased DTS were located on chromosomes 1 and 5 of YXD053. Significant epistatic effects were identified in four traits, but no significant QTL × environment interactions were observed. The information presented here may be valuable for stalk sugar content improvement via marker-assisted selection in silage maize breeding programs.     

Analysis of genetic effects on a complete diallel cross test of Betula platyphylla

The study utilized the offspring of a 5 × 5 diallel cross of Betula platyphylla as the experimental material. Tree height (H), diameter at breast height (DBH) and stem straight degree (SSD) were measured at the fourth and eighth growth year (SSD were measured only in the eighth growth year). ANOVA analyses showed that growth traits in different growth years were significant among families (P < 0.01). There existed extremely significant correlations between H and DBH in the same year. Although the sequencing of average H and DBH of different families were vicissitudinous at the 4th and 8th year, there also existed significant correlations between H and DBH in different year. The general combining ability, special combining ability (SCA) and reciprocal effect (REC) of different hybridized combinations were also different remarkably. The mean square of SCA was significantly higher than GCA, implied that the non-additive effect played major roles. When B5, B8 and MB15 were selected as parents, the offspring performed perfectly in traits of H, DBH and SSD at the eighth growth year respectively. B5 × XB11, B8 × XB11 and B8 × MB15 had highest SCA values in traits of H, DBH, and SSD at the eighth growth year respectively. Consequently, in order to achieve optimal outcomes, seed orchard building and clonal propagation should be considered simultaneously in birch’s genetic improvement process.