烘烤专用型小花生新品种潍花7号的选育研究

潍花7号是潍坊市农科院以“优质专用”为育种目标,以“79266”做母本,“花28”为父本经有性杂交选育而成。该品种植株综合性状好,抗逆性强,内、外观品质俱佳,O/L比值高达1.92,在山东省区试和生产试验中均比鲁花12号增产8%以上,高产示范单产达7200kg/hm2以上,2001年通过山东省农作物品种审定委员会审定。     

瑞香狼毒杀虫活性成分的提取与分离

以菜粉蝶 (PierisrapaeL .) 5龄幼虫为试虫 ,进行生物活性跟踪 ;采用浸提、萃取、层析等多种方法 ,从瑞香狼毒 (StellerachamaejasmeL .)根中分离出 3种活性成分单体 ,并通过物质结构的四大谱 (IR ,UV ,NMR ,MS)鉴定 ,它们分别为伞形花内酯、瑞香亭和狼毒色原酮     

浅谈提高英语短文听力的“W·H”原则及其应用

从分析英语文章文体的角度出发,系统阐述听力短文的类型和各自的特点。独辟蹊径,提出了W·H原则,并且详细分析了它在实践中的应用,旨在帮助学生克服听力障碍,养成良好的听力思维和习惯,提高听力水平。     

T1BL.1RS易位染色体对小麦 农艺性状间偏相关的影响

以三交组合（10-A/88-1643//川育12号）的F     

Quantitative trait loci for seedling vigor in rice under field conditions

Previous QTL studies on seedling vigor in rice (Oryza sativa L.) were conducted all based on laboratory germination tests. In the current study, a set of recombinant inbred lines derived from a rice cross were assessed for seedling vigor related traits in natural field environments including two treatments (drained soil and flooded soil). Composite interval mapping identified nine QTL for seedling vigor traits that correlated positively with each other. Individual QTL explained 4–14% of the total trait variation. Among the QTL, three and four were specific to the drained and flooded treatments, respectively, while two others were common between the two treatments. Four QTL (qFV-1-1, qFV-3-2, qFV-5-1 and qFV-10) each simultaneously showed effect on two or more traits with additive effects always in the same direction. The QTL qFV-5-1 could be further resolved into at least two linked loci, qFV-5-1a controlling seedling height and qFV-5-1b controlling seedling dry weight while the QTL qFV-10 could be a single locus with a pleiotropic effect on both seedling height and dry weight. The QTL qFV-1-1 and qFV-3-2 expressed specially under the flooded conditions, each pleiotropically controlling both coleoptile and seedling emergence. These two QTL were completely different from that affecting seedling emergence in the drained conditions. Comparison of the QTL indicated that the QTL mapping results based on field assessments could to some extent coincide with those based on lab tests but the discrepancy between the two kinds of experiments could not be overlooked.     

Utilization of β-carotene fromSpirulina platensis by rats

The availability of -carotene from Spirulina as compared to standard all trans -carotene was studied by the liver and kidney vitamin A storage method. After 21 days of vitamin A depletion, the rats were repleted with -carotene from Spirulina and a standard source at two dietary levels (60 and 120 µg/day) for a 10 day period. At lower levels, the liver storage levels of vitamin A and the percent of -carotene absorption were comparable to those of the standard. At higher levels both these parameters of the Spirulina fed group were significantly (P<0.01) inferior to the standard source fed group. However, the Spirulina fed group showed better (P<0.05) growth than the standard fed group did at both low and high levels of feeding.     

Constituents of plants growing in Qatar

The study of the flavonoids of the unripe fruits ofGlossonema edule, resulted in the isolation and identification of apigenin 6,8-di-C-glucoside (violanthin) and luteolin 7-O-glucoside.     

超高产花生新品种粤油7号引进和示范初探

2002年从广东等省引进6个花生新品种,品种比较试验和生产示范结果显示,粤油7号表现超高产特性,干荚果产量和籽仁产量均比当地对照种增产14.7%以上,粤油7号抗多种病害,矮壮抗倒伏,适应性强,适宜在江西推广种植。     

1RS／1BL易位对蓝粒小麦异代换染色体传递的影响

利用一个普通小麦与中间偃麦草形成的 4 E/ 4 D蓝粒二体代换系 ,同时也是一个 1RS/ 1BL 纯合易位系 ,与不同的普通小麦品种 (系 )杂交 ,以籽粒颜色作为标记性状 ,研究了 1RS/ 1BL 易位染色体对 4 E染色体在杂种中的传递行为的影响。结果发现 ,在杂种 F1 中 ,1RS/ 1BL易位极显著地降低了 4 E染色体通过雌雄配子传递的频率。但当1RS/ 1BL 易位染色体在杂种 F1 中以二体存在时 ,其对 4 E染色体传递的影响在雌雄配子中有所不同 ,可能会进一步降低 4 E染色体通过雌配子传递的频率 ,而在雄配子中 4 E染色体的传递频率则有所提高 ,导致 F2 籽粒颜色分离出现极显著变化。这一结果表明 ,4 E染色体在杂种中的传递强烈地受 1RS/ 1BL 易位染色体及其存在状态影响 ,也说明不同外源染色体位于同一小麦遗传背景中可能存在相互作用的制约