氮素形态对樱桃番茄果实氮素和有机酸代谢的影响   总被引：1，自引：0，他引：1  

XU Xin-Juan  LI Qing-Yu  SONG Xiao-Hui  Shen Qi-Rong  Dong Cai-Xia 《土壤圈》2012,22(1):67-78

Cherry tomatoes(Lycopersicon esculentum Mill.,cv.hongyangli) were hydroponically cultivated in a greenhouse to determine the effect of different nitrogen(N) forms on organic acid concentration and the activities of related enzymes involved in nitrogen and organic acid metabolism during cherry tomato fruit development.The results showed that fruit nitrate reductase(NR) activity was much higher following treatment with 100% NO 3 and 75% NO 3 + 25% NH + 4 than with 100% NH + 4 except at maturity.Glutamine synthetase(GS) activity trended downward during fruit development under all three treatments.Plants fed 100% NH + 4 had the lowest fruit citrate and malate levels at maturity,with the highest malate concentration at an early stage.The activity of phosphoenolpyruvate carboxylase(PEPC) was found to be in accord with the malate concentration with every N source.Under all three N forms,the citrate synthase(CS) activity peaked one week before the citrate concentration.  相似文献   

杂草对芳氧苯氧丙酸类(APPs)除草剂的抗性分子机理研究进展   总被引：5，自引：4，他引：1  

夏向东  马洪菊  许孟涵  臧振娟  李建洪 《农药学学报》2013,15(6):609-614

芳氧苯氧丙酸类（aryloxyphenoxypropionates,APPs）除草剂是一类广泛使用的乙酰辅酶A羧化酶抑制剂,可高效专一抑制禾本科杂草的乙酰辅酶A羧化酶（acetyl-coenzyme A carboxylase,ACCase）。目前已出现大量抗芳氧苯氧丙酸类除草剂的禾本科杂草,其抗性大多由叶绿体乙酰辅酶A羧化酶的羧基转移酶（carboxyltransferase,CT）功能域中的氨基酸突变引起。在所有已发现的氨基酸突变中,最引人关注的是第1 781位（对应大穗看麦娘Alopecurus myosuroides质体ACCase的氨基酸残基位置）异亮氨酸到亮氨酸的单点突变,该特定位置形成亮氨酸会导致某些杂草对APPs类除草剂产生抗性。综述了乙酰辅酶A羧化酶CT功能域的研究进展及杂草对APPs类除草剂的抗性分子机理,探讨了杂草对APPs类除草剂抗性分子机理研究中存在的问题,以期为进一步深入研究APPs类除草剂的抗性机制提供参考。  相似文献   

柑橘CsaccA基因功能鉴定     

王超  杨长耀  李菲菲  马小川  陈岳文  肖志伟  尹韬  叶丽  李云松  卢晓鹏 《中国农学通报》2022,38(28):28-35

为改良柑橘果实品质,以一个推测与柑橘果实品质相关的CsaccA基因为研究对象进行功能鉴定。通过该基因过表达转化Micro-Tom番茄,利用PCR和GUS染色鉴定,植株表型观察和生理生化指标测定等方法系统研究CsaccA基因功能。CsaccA基因显著促进植株的生物量,转基因植株根茎叶生物量均显著高于对照,植株生长速度显著快于对照。转基因植株果实提前转色,果实成熟期明显提前。转基因果实品质分析显示,番茄果实主要的糖组分葡萄糖和果糖含量显著增高,主要的酸组分柠檬酸含量显著降低。CsaccA基因有提升果实糖酸比的功能,可为果实品质改良提供参考。  相似文献   

花生RuBPCase小亚基基因的克隆与序列分析     

徐自力  应濠泽  余佳宁  祝锦晶  梁莉佳  沈广圳  张丽娜  杜照奎 《广东农业科学》2014,41(24):122-125

根据已知植物的核酮糖-1,5-二磷酸羧化/加氧酶(RuBPCase)小亚基基因序列设计简并引物,采用RT-PCR技术从花生叶片中克隆得到RuBPCase小亚基基因,命名为AhrbcS,Genbank登录号为KF607110,该基因编码区长度为549 bp,编码182个氨基酸.序列比对结果表明,AhrbcS编码蛋白与绿豆、菜豆、大豆、短绒野大豆和烟豆等具有较高的相似性.  相似文献   

Improvement of the photosynthetic characteristics of transgenic wheat plants by transformation with the maize C4 phosphoenolpyruvate carboxylase gene     

Lin Hu  Yan Li  Weigang Xu  Qingchen Zhang  Lei Zhang  Xueli Qi  Haibin Dong 《Plant Breeding》2012,131(3):385-391

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Molecular bases for resistance to acetyl-coenzyme A carboxylase inhibitor in Japanese foxtail (Alopecurus japonicus)     

Tang H  Li J  Dong L  Dong A  Lü B  Zhu X 《Pest management science》2012,68(9):1241-1247

BACKGROUND: Haloxyfop‐R‐methyl is a widely used herbicide to control Poaceae weeds. Alopecurus japonicus, a widespread annual grass, can no longer be controlled by haloxyfop‐R‐methyl after continuous use of this herbicide for several years. RESULTS: Dose‐response experiments have established that the Js‐R biotype of A. japonicas has evolved resistance to aryloxyphenoxypropionates (APPs). Target‐site enzyme sensitivity experiments have established that the haloxyfop (free acid) rate causing 50% inhibition of acetyl‐CoA carboxylase (ACCase) activity (I₅₀) for the resistant (Js‐R) biotype is 11 times higher than that for the susceptible (Js‐S) biotype. In many cases, resistance to ACCase‐inhibiting herbicides is due to a resistant ACCase enzyme. Full‐length DNA and mRNA sequences of the plastidic ACCase gene were amplified. Eight single‐nucleotide differences were detected in this region. Four of the nucleotide changes were silent mutations. However, the other four nucleotide mutations caused four amino acid substitutions, replacing Arg‐1734 with Gly, Met‐1738 with Leu, Thr‐1739 with Ser and Ile‐2041 with Asn in the R biotype respectively; the substitution at position 2041 had been reported, while the other three had not. CONCLUSION: The ACCase in the Js‐R biotype was less susceptible to haloxyfop‐R‐methyl than that in the Js‐S biotype. Moreover, the amino acid substitution of Ile‐2041 with Asn might confer resistance to haloxyfop‐R‐methyl in A. japonicas. Copyright © 2012 Society of Chemical Industry  相似文献   

Effect of propionate, pyruvate and β-hydroxybutyric acid on pyruvate carboxylase mRNA expression of in vitro culture bovine hepatocytes     

Chuang XU  Zhe WANG 《Animal Science Journal》2006,77(4):440-446

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Regulatory Properties of Phosphoenolpyruvate Carboxylase in Crassulacean Acid Metabolism Plants: Diurnal Changes in Phosphorylation State and Regulation of Gene Expression     

《Plant Production Science》2013,16(2):171-181

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盐胁迫下野大麦耐盐生理机制初探   总被引：10，自引：4，他引：10  

王雪青  张俊文  魏建华  王宏芝  李瑞芬 《华北农学报》2007,22(1):17-21

以盐生植物野大麦、甜土植物中国春小麦为材料,研究了NaCl胁迫对野大麦、小麦幼苗叶片质膜透性、含水量、地上和根部离子含量、脯氨酸含量、磷酸烯醇式丙酮酸羧化酶(PEPCase)活性的影响。结果表明,随盐胁迫浓度增加,野大麦的细胞膜透性、Na 含量、脯氨酸含量、Na /K 、PEPCase活性增加,含水量、K 含量下降;但在相同盐胁迫条件下野大麦地上部和根部Na 含量明显低于小麦,而根中K 含量高于小麦,表明野大麦可能具有拒绝吸收Na 和维持高K 含量的能力;野大麦的脯氨酸含量增加幅度小于小麦,表明在盐胁迫下野大麦不是通过脯氨酸的积累来达到体内渗透平衡的;野大麦PEPCase活性增加明显高于小麦,说明提高光合效率可能是野大麦实现盐适应的主要措施之一。  相似文献   

低温和NaCl对玉米叶片离体PEPCase活性及其调节特性的影响   总被引：1，自引：0，他引：1  

马力耕  冯福生 《华北农学报》1993,8(2):54-58

对玉米叶片磷酸烯醇丙酮酸羧化酶(PEPCase)的低温失活现象的研究结果表明,低温贮存期间,玉米叶片离体PEPCase活性随贮存时间的延长而明显降低.对效应剂G6p、Gly和2.4—D的敏感性也减弱.甘油对低温贮存期间酶的活性和对2.4—D的敏感性均有保护效应;G6p单独存在时对酶的活性和2.4—D的敏感性均无保护效应,但同一浓度的G6p在与Gly和甘油同时作用时对酶的活性和2.4—D的敏感性均有保护效应,其保护程度优于同浓度的甘油.NaCl对PEP-Case活性有抑制作用.对酶对效应剂的敏感性影响较小.对低温贮存期间酶的活性和对效应剂的敏感性均无保护效应,并能加速酶的低温失活和对效应剂敏感性的减弱.上述试剂对低温贮存期间酶对效应剂敏感性的保护程度与对其活性的保护程度相一致,表明低温贮存期间酶对效应剂敏感性减弱与其低温失活有直接关系.  相似文献