逆境条件下植物CBL-CIPK信号途径转导的分子机制

非生物逆境条件下,植物细胞中的钙离子浓度会发生变化从而导致独特的钙信号的产生,钙信号通过与各种钙离子结合蛋白作用,从而将信号继续向下游传递.CBL蛋白作为近年来刚发现的一类钙结合元件,通过与一类丝氨酸/苏氨酸蛋白激酶-CIPK相互作用而形成了一套植物钙信号传递网络,并且在盐、干旱、低钾等非生物逆境的信号传递中起着重要作用.     

两个甘蓝CBL基因的基因组解析

利用比较基因组学的方法从甘蓝基因组中鉴定出两个CBL基因,并对其结构、遗传进化、顺式元件进行了分析,以期为进一步研究这两个基因的功能和利用它们进行甘蓝抗逆分子育种提供有益借鉴。     

CBL家族在植物逆境胁迫响应和生长发育中的作用

钙离子作为第二信使,参与植物体中生长发育和逆境胁迫的调节。钙调磷酸酶B类似蛋白CBLs作为钙离子感受器,通过与其互作蛋白激酶作用解密钙信号。CBLs在植物逆境胁迫以及生长发育调控方面起重要作用;近年来,这方面研究工作取得了重要进展。针对CBL家族结构特征及其在植物逆境胁迫和生长发育中的调控作用进行简要概述。     

CBL与PBL教学模式在兽医内科学教学中的应用

针对兽医内科学教学过程中存在的问题,探讨了以案例为基础的教学模式(CBL)与以问题为基础的教学模式(PBL)在兽医内科学教学中的应用,旨在为深化教学改革、提高教学质量提供参考。     

马铃薯CBL9基因的基因组解析

利用比较基因组学的方法从马铃薯基因组中鉴定出一个与AtCBL9直系同源的基因StCBL9,并对该基因的结构、遗传进化、顺式元件进行了分析,为下一步研究该基因的功能和利用其进行马铃薯抗逆分子育种提供了有益借鉴。     

玉米ZmCIPK21基因的克隆与分析

CIPK(CBL-interacting protein kinase)是近年来鉴定出的植物中特有的一类Ca2+传感器,与其互作的蛋白一起在植物特定的生长发育和应答胁迫过程中起重要作用。本研究从玉米中克隆到1个1338bp的ZmCIPK21基因,荧光定量PCR分析表明ZmCIPK21与盐、ABA、高温等逆境胁迫相关;生物信息学分析表明ZmCIPK21基因组含有14个外显子和13个内含子,蛋白结构上具有CIPK所共有的N端激酶结构域和C端NAF保守结构域。与拟南芥CIPK家族进化分析结果显示ZmCIPK21与AtCIPK21具有较高同源性。     

玉米CBL基因的生物信息学分析

利用生物信息学方法从玉米的基因组中鉴定出10个CBL基因,并对这些基因的染色体分布、进化、蛋白基序、顺式反应元件进行了系统分析。结果表明,玉米的CBL基因分为3个不同的进化类群,在基因组中的分布是不均匀的,而且都含有响应逆境信号的不同顺式反应元件。玉米CBL基因预测编码的蛋白都含有3个EF-手型结构,而且被预测定位在不同的细胞组分中。说明它们可能参与玉米的逆境响应过程,而且在功能上各不相同。     

Properties of thermoplastic composites with cotton and guayule biomass residues as fiber fillers

This study was conducted to evaluate the suitability of using residual plant fibers from agricultural waste streams as reinforcement in thermoplastic composites. Three groups of plant fibers evaluated included cotton burrs, sticks and linters from cotton gin waste (CGW), guayule whole plant, and guayule bagasse. The plant fibers were characterized for physical (bulk density and particle size distribution) and chemical properties (ash, lignin and cellulose contents). A laboratory experiment was designed with five fiber filler treatments, namely control (oak wood fiber as the filler - OWF), cotton burr and sticks (CBS), CBS with 2% (by weight) second cut linters (CBL), CBS with 30% (by weight) guayule whole plant (CGP), and CBS with 30% (by weight) guayule bagasse (CGB). The composite samples were manufactured with 50% of fiber filler, 40% of virgin high-density polyethylene (HDPE), and 10% other additives by weight. The samples were extruded to approximately 32 × 7 mm cross-sectional profiles, and tested for physico-mechanical properties. The CBS and CBL had considerably lower bulk density than the other fibers. Cotton linters had the highest α-cellulose (66.6%), and lowest hemicellulose (15.8%) and lignin (10.5%) of all fibers tested. Guayule whole plant had the lowest α-cellulose and highest ash content. Both CBS and guayule bagasse contained α-cellulose comparable to OWF, but slightly lower hemicellulose. Evaluation of composite samples made from the five fiber treatments indicated that fibers from cotton gin byproducts and guayule byproducts reduced the specific gravity of the composites significantly. However, the CBS and CBL samples exhibited high water absorption and thickness swelling, but the addition of guayule bagasse reduced both properties to similar levels as the wood fiber. The CGP exhibited significantly lower coefficient of thermal expansion. Composite samples with the five different fiber fillers showed similar hardness and nail holding capacity, yet oak fibers imparted superior strength and modulus under flexure and compression with the exception of the compressive modulus of CGB composites. In general, both cotton ginning and guayule processing byproducts hold great potential as fiber fillers in thermoplastic composites.     

玉米ZmCIPK24-2基因在盐胁迫应答中的功能研究

土壤盐化会影响作物正常生长发育,导致农作物减产。植物在长期适应环境的过程中,进化出了相应的耐盐分子机制。钙调磷酸酶B类蛋白(CBL)及CBL互作蛋白激酶(CIPK)参与植物对盐胁迫的响应。本研究鉴定到一个拟南芥AtSOS2的同源基因ZmCIPK24-2,实时荧光定量聚合酶链式反应结果表明ZmCIPK24-2基因在玉米各组织部位广泛表达,其中在花粉表达量最高;ZmCIPK24-2受盐胁迫诱导表达。ZmCIPK24-2能部分互补拟南芥atsos2突变体的盐敏感表型,在高盐浓度下转基因株系比atsos2突变体的存活率显著提高,根长显著增长。亚细胞定位实验表明ZmCIPK24-2定位于细胞质、细胞膜与核膜。利用酵母双杂交实验及LUC互补成像实验发现ZmCIPK24-2与玉米CBLs家族中的ZmCBL1、ZmCBL4、ZmCBL8和ZmCBL9互作。本研究为解析玉米CBL-CIPK信号通路的功能提供了新的实验证据。     

CBL多媒体教学模式在植物组织培养实验教学中的应用

以上饶师范学院2006级生物科学专业1班作为对照班,2008级生物科学专业1班作为实验班.对照班采用演示实验教学模式,实验班采用CBL多媒体教学模式.采用问卷调查的方法,客观评价CBL多媒体教学模式在植物组织培养实验教学中的效果.结果表明:CBL多媒体教学模式可以调动学生学习的积极性,培养学生的创新能力,提高其学习成绩...