棉花种间杂交新品种秦远4号的选育

采用棉属种间杂交新方案,获得陆地棉×斯特提棉可育杂种.经2次回交后,在枯黄萎病圃稳定性状,定向培育,人工选择,首次育成了丰产、优质、抗病、抗旱、抗盐碱的棉花种间杂交新品种秦远4号和一批新种质.秦远4号创皮棉3 897 kg/hm2的世界最高单产纪录.     

玉米叶片胚性愈伤组织诱导及其与内源IAA和ABA关系的初步研究

玉米幼叶愈伤组织的形成能力因其形态学部位的不同而呈显著差异, 从基部向上依次递减, 幼叶外植体的内源IAA和ABA水平亦相应地呈递减趋势。 2, 4-D及与BA组合对基部切段的愈伤组织形成无显著影响, 愈伤组织生长符合Logistic曲线, 单独使用BA不利于愈伤组织形成; 采用2 mg/L 2, 4-D与0.5 mg/L BA的组合最有利于胚性愈伤     

温度对棉纤维强度及超分子结构的影响

利用短季棉中棉所16号品种, 研究了温度对棉纤维断裂比强度与超分子结构的影响, 结果 表明： 纤维断裂比强度随铃龄增大而升高; 相同铃龄随温度下降断裂比强度降低。 较高 温度条件下α角随铃龄增大不断宽化(变大), 对纤维强度提高不利; 较低温度条件下α角 随纤维发育不断变小(优化), 某种程度上有利于纤维强度提高;     

一个普通小麦-大赖草易位系T01的选育与鉴定

将抗赤霉病的普通小麦-大赖草Lr.2染色体单体异附加系花粉经过60Co-γ射线处理, 然后给感赤霉病的普通小麦品种“扬麦5号”授粉, 杂交后代连续2年进行赤霉病抗性单株接种鉴定, 从中选育出一个普通小麦-大赖草异易位系。 经过染色体荧光原位杂交和Giemsa C-分带鉴定, 易位发生在普通小麦4B染色体长臂和大赖草第2条染色体(L     

农业政策性信贷资金运行的实证研究Ⅱ——对四川省大中城市区、农业主产区和贫困地区间的比较分析

对大中城市区、农业主产区和贫困区三类农业政策性金融区域进行了抽样调查 ,实证地对农业政策性资金在三类金融区域的运行效果和运行质量进行了比较分析 ,找出了区域政策性金融存在的问题 ,提出了各金融区域的农业政策性信贷资金运用的策略选择。     

AB Intio Study on the Interaction between CH_4 and the Coal Surface

The atom cluster model of coal surface is proposed.Quantum chemical ab initio calculation with base set STO 4 31G indicates that the interaction between CH 4 and coal surface is anisotropy and the maximum interaction potential (or adsorption potential) is 2.65 kJ/mol,rotation potential barrier is 1.34 kJ/mol.These results have shown that the adsorption of methane on coal surface should be a physical process (that is,freezing on surface).     

Synthesis and Structure–Activity Relationships of Miticidal 4,5-Dihydropyrazole-5-thiones

A series of novel 4,5-dihydropyrazole-5-thiones (DHPs) was synthesised by treating the corresponding dihydropyrazolones with ‘Lawesson’s reagent and evaluated for miticidal activity against two-spotted spider mites (Tetranychus urticae Koch). Of these, 3-(4-chlorophenyl)-4,4-dimethyl-1-phenyl-4,5-dihydropyrazole-5-thione, 3-(4-chlorophenyl)-4-ethyl-4-methyl-1-phenyl-4,5-dihydropyrazole-5-thione, 3-(4-chlorophenyl)-1-phenyl-4,5-dihydropyrazole-5-thione-4-spirocyclopentane and 4,4-dimethyl-1-phenyl-3-(4-trifluoromethyl-phenyl)-4,5-dihydropyrazole-5-thione were highly active (pEC₅₀>4·0) and were more effective than the miticide dicofol (pEC₅₀=3·879), which has traditionally been used for the control of phytophagous mites. Structure–activity relationship (SAR) studies were performed on each position of the pyrazole ring of DHPs. The results indicated that the unsubstituted phenyl, 4-substituted phenyl and thioxo groups on the 1-, 3- and 5-positions of DHPs respectively were required for activity. Quantitative SAR studies using physicochemical parameters of substituents and the capacity factor k′ as a hydrophobicity index suggested that: (a) the activities of all types of DHPs examined were mainly dominated by hydrophobicity, (b) the bulkiness of 4-substituents of the 3-phenyl ring favoured the activity and (c) the log k′ optimum for all DHPs was 1·675, equivalent to a log P_ow value of c. 5·0.     

基于Arduino的智能送药小车

智能单片机小车由于其智能、方便、快捷,被广泛应用于各行业.本研究的智能送药小车包括了Ardunio mega2560单片机、OpenMv4智能识别装置、寻迹装置、L298N模块、433M无线模块等装置.研究结果表明:智能送药小车通过识别地面安置路线以及相应的病房号,可以自动躲避障碍,自动沿设定的路线行驶,既可以实现单车...     

中国野生葡萄抗霜霉病相关基因VpPR4b及其启动子的克隆和功能分析

以中国野生葡萄(Vitis piasezkii)'留坝-8'(抗霜霉病)和欧亚种葡萄(V.vinifera)'黑比诺'(易感霜霉病)为材料,克隆得到抗霜霉病相关基因VpPR4b和VvPR4b.序列分析发现VpPR4b和VvPR4b核苷酸序列相似性为98.61％.VpPR4b编码区为432 bp,编码143个氨基酸,含有...     

碱性硅肥对香蕉枯萎病的影响

本研究以香蕉枯萎病菌尖镰孢古巴专化型4号小种为目标菌,采用PDA平板培养、土壤平板培养和盆栽试验三种方法来测定碱性硅肥对香蕉枯萎病病菌的影响。结果表明,使用第一种方法,硅肥在小于1000倍液的范围内对菌丝生长均显示抑制作用,其中原液的抑制率达到最高并与其他浓度处理,以及对照普通肥料有显著的差异（p<0.05）;第二种方法显示与第一种方法的抑菌效果一致;第三种方法显示,硅肥处理的香蕉苗病情指数为43.85%,对照肥料处理的为68.57%,空白对照的为80.00%。本研究认为,碱性硅肥对香蕉枯萎病菌有一定的抑制作用,在生产上应用潜力。