华杂四号油菜最佳施肥模型及经济效益分析

通过对华杂四号油菜的施氮量、施磷量、施钾量和施硼量的研究 ,找出了对华杂四号油菜产量影响较大的试验因子是 :施氮量、施磷量和施硼量。并利用频数分析法 ,通过计算机模拟寻优 ,建立了华杂四号油菜在淮南稻区 30 0 0kg/ha以上的优化栽培模型     

Growth of Roots Emerged from Excised Phytomers of Three Gramineous Species under a Low Osmotic Potential

Abstract

The growth of crown and lateral roots emerged from the excised phytomers of pearl millet (Pennisetum typhoideum Rich.), barnyard millet (Echinochloa frumentacea Link.) and maize (Zea mays L.) was studied under normal and low osmotic potential conditions. The plants were grown in two solutions with osmotic potentials of –0.02 and –0.54 MPa for 6 days. The relative growth rate of the roots in total length (RGR_L) , was not affected by osmotic stress in pearl and barnyard millets, but that in stressed maize was reduced to 64% of the control. Similarly, the relative growth rate of the roots in dry weight (RGR_W), was not affected by osmotic stress in pearl and barnyard millets, but significantly reduced in maize. Osmotic stress increased the specific root length of the lateral roots in pearl and barnyard millets, but did not affect that of maize. The photosynthetic rate (Pr) in the two millets was decreased to ca. 60% of the control by the stress, and that in maize was reduced to 21%. Under the stress, Pr in the three species was limited mainly by low stomatal conductance, but no clear relationship was found between Pr and osmotic adjustment of the leaf. The relative water content of the leaf was lower in maize than in the two millets. The resistance to water flow through the phytomer (R) was significantly increased by osmotic stress in maize, but not significantly in the two millets. The mean root length (RL) was decreased by the stress in maize, but not in the two millets. The maintenance of RGR_L in the two millets was associated with sustained R, RL and also with the maintenance of Pr and allocation of assimilates to roots.     

TTI交联聚乙烯醇木材胶黏剂的研究

研究在水基中三苯基甲烷-4,4',4"-三异氰酸酯(TTI)交联聚乙烯醇(PVA)所形成的白色乳胶。采用正交试验法探讨聚乙烯醇、催化剂-x、TTI的加入量、反应时间及反应温度对该乳胶性能的影响。合成的单组份环保乳胶适用于木材、纸品等加工业,以及建筑业。     

急性高温胁迫对大口黑鲈"优鲈3号"肝脏凋亡相关酶活性和基因表达的影响

为了探究急性高温胁迫对大口黑鲈“优鲈3号”凋亡相关酶活性和基因表达的影响,将25℃下暂养的大口黑鲈“优鲈3号”直接放入37℃水环境中,探究急性高温胁迫后幼鱼肝脏组织Caspase3、Caspase9和基因酶活的变化。结果显示:37℃高温胁迫后,肝脏Caspase3和Caspase9酶活均显著升高,且随着胁迫时间的延长呈升高趋势,在48 h达到峰值。基因Caspase3和Caspase9的表达量均呈现先升高再下降的趋势,在6 h的表达量达到峰值,随之下降,并在48 h与对照组无显著性差异。BCL-2的表达量于1 h达到峰值,之后显著下降,48 h时BCL-2的表达量仅为对照组的0.04倍。结果表明,高温胁迫会使大口黑鲈“优鲈3号”幼鱼发生凋亡甚至细胞坏死。     

“放管服”改革背景下兽药监管方式的思考与创新——江苏构建“互联网+兽药监管“”平台的探索与实践

结合兽药行业发展现状与特点,分析了“放管服”改革背景下兽药审批与监管面临的新形势与新要求,围绕推动服务更加便民高效、监管更加精准有效的工作目标,介绍了江苏通过创新监管方式,积极探索与构建“互联网+兽药监管”平台的具体做法和实践,以期为“放管服”改革背景下开展兽药监管工作提供参考。     

旱地谷子“五改”技术的增产效果与原因

针对山西省谷子增产缓慢和效益低的问题，经过调查、试验、示范研究，形成了以优良品种为核心，增肥增密为基础，调节播期，协调资源转化的“五改”技术体系，并就其示范效果及增产原因作了阐述     

川西北牧区家庭牧场优化模式研究示范阶段总结

本文叙述了“九五”重大农业攻关项目“川西北牧区家庭牧场优化模式研究示范”课题的实施进展情况,已研究提出了适合四川省牧区推行的家庭牧场优化模式,即“五推、四化、三配套”,简称“五·四·三”模式。此项目采用示范与试验相结合,取得了初步成效。使高寒牧区实现了“一步跨千年”的历史变革,为牧区畜牧业实现跨世纪持续发展奠定了良好基础。     

海岛棉不同果枝品种间杂交产量性状的遗传及F1和F2群体优势分析

采用MINQUE（1）统计方法及AD模型对9个海岛棉品种（系）及其20个F1组合9个产量性状的两年资料进行了遗传分析。结果表明，海岛棉长果枝与零式果枝品种间杂交，各产量性状均存在极显著的加性效应方差比例；衣分、铃重、霜后铃数、总铃数和皮棉产量存在极显著的显性效应；均存在显性与环境的互作。品种3836具有霜前铃数和霜前     

籼型杂交水稻恢复系“752”抗除草剂转基因研究

用基因枪法对籼型杂交水稻恢复系“75 2”进行了bar基因的遗传转化 ,共获得可育的抗除草剂Basta的转基因株系 6个。PCR检测结果表明 ,抗性转基因植株表现为阳性 ,而非转化的对照表现为阴性 ,证明T0 代转基因水稻基因组中整合有bar基因。转基因植株的抗性能遗传至后代 ,在T1 代中观察到了抗、感分离现象     

水稻新品种“赣早籼40号”的选育

:“赣早籼 40号”属中早熟早籼水稻新品种 ,该品种丰产稳产 ,品质较优 ,中抗稻瘟病和白叶枯病 ,适合江西、湖南等双季稻区作优质早稻搭配种植