钙依赖性蛋白激酶(calcium-dependent protein kinases,CDPKs or CPKs)作为一类钙感知蛋白在植物的生长发育和胁迫应答中起着重要的作用。LeCPK2(GenBank accession No.:GQ205414)是我们从番茄中分离的第3个CDPK基因,前期研究表明LeCPK...钙依赖性蛋白激酶(calcium-dependent protein kinases,CDPKs or CPKs)作为一类钙感知蛋白在植物的生长发育和胁迫应答中起着重要的作用。LeCPK2(GenBank accession No.:GQ205414)是我们从番茄中分离的第3个CDPK基因,前期研究表明LeCPK2可能在植物热胁迫应答中发挥作用。为了进一步研究其在热胁迫中的功能,我们通过电子克隆的方法分离了LeCPK2的启动子序列,并通过LeCPK2过表达烟草分析其在高温胁迫中的潜在的功能。生物信息学分析显示,LeCPK2启动子中包含5个热响应元件,和前期试验结果一致。野生型植株在受到热胁迫后,对光更为敏感,强光照下植株叶片发生萎蔫,而强光本身不会对未受热胁迫的健康植株造成伤害。LeCPK2转基因植株热、光胁迫后不会出现受害表型。以上研究表明,LeCPK2在植物的热胁迫应答中发挥重要作用,能够有效保护植株免受高温胁迫的损害,是一个优秀的耐热(光)基因。本研究将为揭示番茄LeCPK2遗传功能及对其开发利用奠定基础。展开更多
Utilization of organic nitrogen （N） is an important aspect of plant N assimilation and has potential application in sustainable agriculture. The aim of this study was to investigate the plant growth, C and N accumul...Utilization of organic nitrogen （N） is an important aspect of plant N assimilation and has potential application in sustainable agriculture. The aim of this study was to investigate the plant growth, C and N accumulation in leaves and roots of tomato seedlings in response to inorganic （NH4^＋-N, NO3^-N） and organic nitrogen （Gly-N）. Different forms of nitrogen （NH4^＋-N, NO3^--N, Gly-N） were supplied to two tomato cultivars （Shenfen 918 and Huying 932） using a hydroponics system. The plant dry biomass, chlorophyll content, root activity, total carbon and nitrogen content in roots and leaves, and total N absorption, etc. were assayed during the cultivation. Our results showed that no significant differences in plant height, dry biomass, and total N content were found within the first 16 d among three treatments; however, significant differences in treatments on 24 d and 32 d were observed, and the order was NO3^--N 〉 Gly-N 〉 NH4^＋-N. Significant differences were also observed between the two tomato cultivars. Chlorophyll contents in the two cultivars were significantly increased by the Gly-N treatment, and root activity showed a significant decrease in NHa^＋-N treatment. Tomato leaf total carbon content was slightly affected by different N forms; however, total carbon in root and total nitrogen in root and leaf were promoted significantly by inorganic and organic N. Among the applied N forms, the increasing effects of the NH4^＋-N treatment were larger than that of the Gly-N. In a word, different N resources resulted in different physiological effects in tomatoes. Organic nitrogen （e.g., Gly-N） can be a proper resource of plant N nutrition. Tomatoes of different genotypes had different responses under organic nitrogen （e.g., Gly-N） supplies.展开更多
为探究收集于国内外不同番茄种质资源的亲缘关系,选用48对SSR引物856份番茄材料进行遗传多样性及群体结构分析。结果显示,46对多态性SSR标记在856份番茄材料中共检测到228个等位位点,平均每个标记检测到4.957个等位位点;各位点Shannon’...为探究收集于国内外不同番茄种质资源的亲缘关系,选用48对SSR引物856份番茄材料进行遗传多样性及群体结构分析。结果显示,46对多态性SSR标记在856份番茄材料中共检测到228个等位位点,平均每个标记检测到4.957个等位位点;各位点Shannon’s多样性指数和基因多样性平均值分别为0.687和0.383;多态性信息含量指数(polymorphism information content,PIC)平均值为0.335,说明检测的材料具有一定的遗传多样性。根据番茄果实大小将其分为3大类群,野生番茄(7份)、樱桃番茄(207份)及栽培型番茄(642份)三个类群;通过群体结构分析将856份材料划分为4个类群,两种类群划分有相似的结果。本研究为番茄种质资源的有效利用及核心种质构建提供了理论基础。展开更多
近年来,番茄叶霉病的大面积发生对中国番茄生产造成极大影响。叶霉病菌(Cladosporium fulvum)与番茄植株发生的亲和性互作是番茄叶霉病发生的根源,以叶霉病抗性基因Cf为主导的抗叶霉病育种研究是工作的重点,但由于Cf基因抗性不断被克服...近年来,番茄叶霉病的大面积发生对中国番茄生产造成极大影响。叶霉病菌(Cladosporium fulvum)与番茄植株发生的亲和性互作是番茄叶霉病发生的根源,以叶霉病抗性基因Cf为主导的抗叶霉病育种研究是工作的重点,但由于Cf基因抗性不断被克服,急需挖掘抗性更广更强的Cf基因。番茄品种‘CGN7495’含有Cf-12基因,田间表现出有效的C.fulvum抗性。本研究通过构建6世代群体,分析了Cf-12抗性的遗传规律,证实了该基因符合单基因的显性遗传规律,为分离群体分组分析法筛选Cf-12基因做了铺垫;采用父母本重测序及F2代极端性状混池简化测序SLAF(Specific locus amplified fragment sequencing)来定位Cf-12基因,将其定位到番茄第6号染色体上并最终筛选出3个候选基因。研究为Cf-12的精确克隆和相关抗病机制的研究提供了理论参考。展开更多
MYB类蛋白家族是所有真核生物中存在的庞大且功能丰富的一类转录因子,MYB蛋白主要参与形态建成、次生代谢等进而参与植物的非生物胁迫。文章通过比对美国国家生物技术信息中心(National Center for Biotechnology Information,NCBI)数据...MYB类蛋白家族是所有真核生物中存在的庞大且功能丰富的一类转录因子,MYB蛋白主要参与形态建成、次生代谢等进而参与植物的非生物胁迫。文章通过比对美国国家生物技术信息中心(National Center for Biotechnology Information,NCBI)数据库,在番茄中发现了一个具有EAR转录抑制子的R1-MYB类转录因子,即SlMYBL,通过同源克隆获得SlMYBL基因的全长cDNA。SlMYBL基因在番茄的所有组织中均有表达,在果实中的表达量相对较高,其次是根和叶片。有研究表明R1-MYB类转录因子可参与植株的逆境应答,为了解SlMYBL是否响应逆境应答,文章定量分析了番茄在不同胁迫处理下SlMYBL基因的转录水平,发现其转录水平在盐胁迫下明显降低,而对甘露醇胁迫并没有明显的差异,表明SlMYBL基因可能参与了番茄植株响应盐胁迫的过程。为研究SlMYBL基因作用的分子机理,进一步构建了该基因的CRISPR表达载体,并获得SlMYBL基因的CRISPR敲除转基因番茄。该研究为发现SlMYBL基因在植物生长发育中的作用奠定了一定的理论基础。展开更多
文摘钙依赖性蛋白激酶(calcium-dependent protein kinases,CDPKs or CPKs)作为一类钙感知蛋白在植物的生长发育和胁迫应答中起着重要的作用。LeCPK2(GenBank accession No.:GQ205414)是我们从番茄中分离的第3个CDPK基因,前期研究表明LeCPK2可能在植物热胁迫应答中发挥作用。为了进一步研究其在热胁迫中的功能,我们通过电子克隆的方法分离了LeCPK2的启动子序列,并通过LeCPK2过表达烟草分析其在高温胁迫中的潜在的功能。生物信息学分析显示,LeCPK2启动子中包含5个热响应元件,和前期试验结果一致。野生型植株在受到热胁迫后,对光更为敏感,强光照下植株叶片发生萎蔫,而强光本身不会对未受热胁迫的健康植株造成伤害。LeCPK2转基因植株热、光胁迫后不会出现受害表型。以上研究表明,LeCPK2在植物的热胁迫应答中发挥重要作用,能够有效保护植株免受高温胁迫的损害,是一个优秀的耐热(光)基因。本研究将为揭示番茄LeCPK2遗传功能及对其开发利用奠定基础。
基金funded by the National High Technol-ogy Research and Development Program of China (863 Program,2006AA10Z221)China Postdoctoral Science Foundation (2005038436)+1 种基金Shanghai Leading Academic Discipline Project (B209)National Key Technologies R&D Program of China during the 11th Five-Year Plan period (2008BADA7B00 2008BADA7B01)
文摘Utilization of organic nitrogen （N） is an important aspect of plant N assimilation and has potential application in sustainable agriculture. The aim of this study was to investigate the plant growth, C and N accumulation in leaves and roots of tomato seedlings in response to inorganic （NH4^＋-N, NO3^-N） and organic nitrogen （Gly-N）. Different forms of nitrogen （NH4^＋-N, NO3^--N, Gly-N） were supplied to two tomato cultivars （Shenfen 918 and Huying 932） using a hydroponics system. The plant dry biomass, chlorophyll content, root activity, total carbon and nitrogen content in roots and leaves, and total N absorption, etc. were assayed during the cultivation. Our results showed that no significant differences in plant height, dry biomass, and total N content were found within the first 16 d among three treatments; however, significant differences in treatments on 24 d and 32 d were observed, and the order was NO3^--N 〉 Gly-N 〉 NH4^＋-N. Significant differences were also observed between the two tomato cultivars. Chlorophyll contents in the two cultivars were significantly increased by the Gly-N treatment, and root activity showed a significant decrease in NHa^＋-N treatment. Tomato leaf total carbon content was slightly affected by different N forms; however, total carbon in root and total nitrogen in root and leaf were promoted significantly by inorganic and organic N. Among the applied N forms, the increasing effects of the NH4^＋-N treatment were larger than that of the Gly-N. In a word, different N resources resulted in different physiological effects in tomatoes. Organic nitrogen （e.g., Gly-N） can be a proper resource of plant N nutrition. Tomatoes of different genotypes had different responses under organic nitrogen （e.g., Gly-N） supplies.
文摘为探究收集于国内外不同番茄种质资源的亲缘关系,选用48对SSR引物856份番茄材料进行遗传多样性及群体结构分析。结果显示,46对多态性SSR标记在856份番茄材料中共检测到228个等位位点,平均每个标记检测到4.957个等位位点;各位点Shannon’s多样性指数和基因多样性平均值分别为0.687和0.383;多态性信息含量指数(polymorphism information content,PIC)平均值为0.335,说明检测的材料具有一定的遗传多样性。根据番茄果实大小将其分为3大类群,野生番茄(7份)、樱桃番茄(207份)及栽培型番茄(642份)三个类群;通过群体结构分析将856份材料划分为4个类群,两种类群划分有相似的结果。本研究为番茄种质资源的有效利用及核心种质构建提供了理论基础。
文摘近年来,番茄叶霉病的大面积发生对中国番茄生产造成极大影响。叶霉病菌(Cladosporium fulvum)与番茄植株发生的亲和性互作是番茄叶霉病发生的根源,以叶霉病抗性基因Cf为主导的抗叶霉病育种研究是工作的重点,但由于Cf基因抗性不断被克服,急需挖掘抗性更广更强的Cf基因。番茄品种‘CGN7495’含有Cf-12基因,田间表现出有效的C.fulvum抗性。本研究通过构建6世代群体,分析了Cf-12抗性的遗传规律,证实了该基因符合单基因的显性遗传规律,为分离群体分组分析法筛选Cf-12基因做了铺垫;采用父母本重测序及F2代极端性状混池简化测序SLAF(Specific locus amplified fragment sequencing)来定位Cf-12基因,将其定位到番茄第6号染色体上并最终筛选出3个候选基因。研究为Cf-12的精确克隆和相关抗病机制的研究提供了理论参考。
文摘MYB类蛋白家族是所有真核生物中存在的庞大且功能丰富的一类转录因子,MYB蛋白主要参与形态建成、次生代谢等进而参与植物的非生物胁迫。文章通过比对美国国家生物技术信息中心(National Center for Biotechnology Information,NCBI)数据库,在番茄中发现了一个具有EAR转录抑制子的R1-MYB类转录因子,即SlMYBL,通过同源克隆获得SlMYBL基因的全长cDNA。SlMYBL基因在番茄的所有组织中均有表达,在果实中的表达量相对较高,其次是根和叶片。有研究表明R1-MYB类转录因子可参与植株的逆境应答,为了解SlMYBL是否响应逆境应答,文章定量分析了番茄在不同胁迫处理下SlMYBL基因的转录水平,发现其转录水平在盐胁迫下明显降低,而对甘露醇胁迫并没有明显的差异,表明SlMYBL基因可能参与了番茄植株响应盐胁迫的过程。为研究SlMYBL基因作用的分子机理,进一步构建了该基因的CRISPR表达载体,并获得SlMYBL基因的CRISPR敲除转基因番茄。该研究为发现SlMYBL基因在植物生长发育中的作用奠定了一定的理论基础。
