冷刺激下AA肉鸡FBP1基因表达量的研究

为了解冷刺激条件下果糖-1,6-二磷酸酶1(FBP1)基因在肉鸡组织中的表达情况,试验选择75只AA肉鸡随机分成了对照组(正常饲养温度)和4个处理组(比正常饲养温度低3 ℃),从雏鸡8日龄开始每天分别进行1、3、5和24 h的冷刺激,在21日龄时结束冷刺激,并于22日龄屠宰测定FBP1基因在AA肉鸡各组织中的表达情况。结果表明,在冷刺激条件下,FBP1基因表达量存在组织特异性,在1 h处理组中FBP1基因在肝脏中的表达量显著高于其他各组织(P< 0.05),在3 h处理组中FBP1基因在肺脏中表达量显著高于除肝脏外的其他各组织(P< 0.05),在5 h处理组中FBP1基因在肝脏中的表达量显著高于其他各组织(P< 0.05),在24 h处理组中FBP1基因在胸腺中的表达量明显高于其他各组织(P< 0.05)。在相同组织不同处理组中,心脏FBP1基因的表达量除3 h组明显降低外,其余处理组随冷刺激时间延长呈下降趋势,肝脏中FBP1基因表达量在5 h组中显著高于其他各处理组(P< 0.05),脾脏中FBP1基因的表达量除在1 h组中明显降低外,其余各处理组随冷刺激时间延长呈下降趋势,肺脏中FBP1基因的表达量呈先上升后下降的趋势,肾脏中FBP1基因表达量除在24 h组中明显降低外,其余各组没有明显变化,胸腺中24 h组FBP1基因表达量显著高于其他处理组(P< 0.05),且其他处理组与对照组差异不显著(P >0.05)。     

Study on the Expression of FBP1 Gene in AA Broilers under Cold Stimulating Environment

In order to study of FBP1 gene expression under cold stimulating environment,75 AA broilers as research object were selected and randomly assigned to 5 groups,one of group was control group that raising in normal temperature,the remaining four groups were cold stimulation groups that raising temperature was 3 ℃ lower than the control group.The time of cold stimulation in four groups were 1,3,5 and 24 h,respectively.Cold stimulation started at 8 days of age,ended at 21 days of age.Broilers were slaughtered at 22 days of age and investigated FBP1 gene expression in each group.The results showed that the expression of FBP1 gene existed tissue specificity under cold stimulating environment.The relative expression level of FBP1 gene in liver was significantly higher than the other tissues in 1 h group (P< 0.05);The relative expression level of FBP1 gene in lung were significantly higher than the other tissues except of liver in 3 h group except for liver (P< 0.05);The relative expression level of FBP1 gene in liver were significantly higher than the other tissues in 5 h group (P< 0.05);The relative expression level of FBP1 gene in thymus were significantly higher than the other tissues in 24 h group (P< 0.05).FBP1 gene expression inside the heart was on the decline in the same organization different treatment groups as the rime of cold stimulating was increasing except for 3 h group.FBP1 gene expression of liver in 5 h group was significantly higher than other FBP1 gene expression in each treatment group.FBP1 gene expression of spleen was significant decreased in 1 h group,the other group extend a downward trend with the extension of cold stimulation time.FBP1 gene expression in lung was downward trend after rising first.FBP1 gene expression in kidney was significantly decreased in 24 h group,and the other groups had no obvious change.FBP1 gene expression of thymus in 24 h group was significantly higher than the other groups (P< 0.05),and there was no significant difference between control group and other four terament groups (P >0.05).     

矮牵牛果实特异表达启动子FBP7的基因克隆及序列分析

为进一步实现外源基因在草莓果实中的特异表达,克隆了矮牵牛果实特异表达启动子FBP7。根据GenBank发表序列设计引物,以矮牵牛(Petunia hybrida)总DNA为模板,通过PCR扩增获得约500 bp的DNA片段,回收该片段并克隆至PUC18载体上,测序后将所得序列与原序列进行比对,其同源性为97%。为分析这些差异序列是否影响启动子功能,进行了启动子功能预测及顺式作用元件分析。结果表明,所克隆的启动子序列应具有启动子功能,且能实现果实特异表达,其序列分析差异可能是由于个体差异及多态性的影响,为草莓果实特异表达启动子的选择提供新思路。     

水分胁迫对苹果叶片叶绿体1.6-二磷酸果糖磷酸酯酶活性的影响

随干旱胁迫进程的延长，苹果叶片组织相对含水量下降，净光合速率，蒸腾速率下降，气孔阻力增加，在胁迫初期，叶片叶绿体内1.6-二磷酸果糖磷酸酯酶活性（FBPase)没有受影响，净光合速率下降是由于气孔阻力增加，叶内CO2浓度降低引起的，随胁迫程度的加深，叶内CO2浓度升高，FBPase活性显著下降，这是此时叶片净光合速率下降的原因之一。     

腾冲红花油茶花蜜蛋白1,6-二磷酸果糖醛缩酶的鉴定、克隆与分析

为鉴定出花蜜中某些影响花蜜化学组成的功能蛋白,并探讨其在花蜜分泌及组分调控过程中的功能,以腾冲红花油茶为试验材料,利用MALDI-TOF/MS质谱分析方法初步鉴定出腾冲红花油茶花蜜中含有1,6-二磷酸果糖醛缩酶(FBP2),然后根据质谱得到的部分肽段序列设计特异性引物,采用SMART RACE方法克隆腾冲红花油茶花蜜FBP2全长cDNA,命名为CRFBPase (GenBank登录号:MG764086)。序列分析表明,该cDNA全长1 077 bp,编码358个氨基酸,分子质量为38 428.13 Da,等电点为7.56。经同源比对分析发现CRFBPase基因序列与普通油茶的FBP2基因序列同源性高达98.8%,同时酶活检测结果也进一步证实该花蜜中含有FBP2,且该酶的活性会随着花蜜分泌累积时间的延长而增加。实时荧光定量PCR结果显示,CRFBPase基因在开花后第5天的蜜腺和花部组织中均有一定量的表达且蜜腺中表达量最高,开花后第5天(泌蜜高峰期)蜜腺显著高于花蕾期。本研究结果为进一步揭示FBP2在植物花蜜形成、分泌及糖组分调控过程中的作用机制提供了一定的理论依据。     

Fire models and methods to map fuel types: The role of remote sensing

Understanding fire is essential to improving forest management strategies. More specifically, an accurate knowledge of the spatial distribution of fuels is critical when analyzing, modelling and predicting fire behaviour. First, we review the main concepts and terminology associated with forest fuels and a number of fuel type classifications. Second, we summarize the main techniques employed to map fuel types starting with the most traditional approaches, such as field work, aerial photo interpretation or ecological modelling. We pay special attention to more contemporary techniques, which involve the use of remote sensing systems. In general, remote sensing systems are low-priced, can be regularly updated and are less time-consuming than traditional methods, but they are still facing important limitations. Recent work has shown that the integration of different sources of information and methods in a complementary way helps to overcome most of these limitations. Further research is encouraged to develop novel and enhanced remote sensing techniques.     

人体醛缩酶C cDNA的克隆及其在家蚕体内的表达(英文)

利用人体醛缩酶C cNDA的一对特异性引物A ld-5′(5′-ggatcccctcactcgtaccca-3′)和A ld-3′(5′g-gatcctcag-taggcatggtt-3′),从人脑cDNA文库中PCR扩增出人体醛缩酶C cDNA,并依次被克隆进克隆载体pCR2.1、转移载体pAcGP67B以及来源于AcNPV和BmNPV的杂交重组病毒HyNPV。通过对家蚕血液的SDS-PAGE电泳和酶活力测定,证明人体醛缩酶C cDNA在家蚕体内成功得到表达。     

加拿大森林火行为预测系统应用及展望

森林火灾频发给我国造成了严重的森林资源损失和其他方面的损失。而我国在森林火行为预测预报研究方面水平较低,还无法准确地对火灾进行预测。加拿大森林火行为预测系统（FBP系统）可以利用森林可燃物类型、气象条件、地形地势及火行为特征等因子准确有效地对森林火行为进行预测预报,对林火管理人员制定灭火计划和组织火灾扑救工作具有十分重要的意义。文中介绍了FBP系统的主要结构和工作原理,以及系统内部参数和预测预报所需的相关数据,概述了该系统在加拿大的实际应用情况,对我国建立森林火灾预报、火行为预测系统进行了展望。     

马氏珠母贝(Pinctada fucata martensii) FBP基因的克隆及其对温度胁迫的响应

果糖-1,6-二磷酸酶(FBP)是催化糖异生过程中的限速酶,当动植物处于温度胁迫等不良环境条件时,FBP通过参与糖异生途径以维持机体的糖平衡,在动植物抗逆过程中起着重要作用。本研究通过RACE技术获得了马氏珠母贝(Pinctada fucata martensii) FBP(Pm-FBP)基因cDNA全长,并使用实时荧光定量PCR技术检测了该基因在马氏珠母贝不同组织中的表达量,以及在17℃(低温组)、22℃(对照组)、32℃(高温组)条件下鳃中的时序表达模式。序列分析显示,Pm-FBP全长为1381 bp,具有54 bp的5¢ UTR和62 bp的3¢ UTR,开放阅读框(ORF)为1020 bp,编码339个氨基酸,预测分子量为37.13 kDa,等电点为6.02。Pm-FBP具有一个Pfam FBPase保守结构域,6个潜在的O-连接糖基化位点(Ser36、Ser56、Ser57、Ser76、Ser80和Thr115),1个潜在的N-糖基化位点,1个金属结合位点(Asp-Pro-Ile/Leu-Asp-Gly/Ser-Thr/Ser)和46个磷酸化位点。多序列比对结果显示,Pm-FBP与长牡蛎(Crassostrea gigas)FBP的相似性最高,为83%;系统进化树显示,Pm-FBP与长牡蛎等贝类聚为一支,然后再与其他软体动物聚为一大支,节肢动物和脊椎动物分别聚类,进化树总体聚为三大支。实时荧光定量结果显示,Pm-FBP在所检测的闭壳肌、鳃、性腺、肝胰腺、足和外套膜等组织中均有表达,在性腺表达量最高,肝胰腺和鳃中有较高表达;对Pm-FBP时序表达的分析发现,Pm-FBP在低温组和高温组实验时间范围内均出现先上升后下降的趋势,且在72 h时达到最大值,表明Pm-FBP参与了马氏珠母贝对温度胁迫的响应;在120 h时,高温组和低温组的Pm-FBP表达量均显著下降,表明Pm-FBP可能主要在短期的温度胁迫中发挥作用。本研究结果为进一步探索马氏珠母贝对温度胁迫的适应性提供了参考资料。     

模糊神经网络在施肥决策系统的应用

针对施肥过程中普遍存在非线性和不确定性问题,对多种模糊神经网络进行分析比较,提出了适合施肥决策系统的FMLP模糊神经网络结构,采用FBP学习算法实现网络结构优化.通过对水稻在同一农田重复进行种植实验,结果表明所建系统可以提供最佳土壤施肥方案.