The objective was to probe the site where the biosynthesis of chlorophyll was blocked under Mo deficiency at low temperature, which led to the decrease of chlorophyll in winter wheat cultivars. The intermediates of ch...The objective was to probe the site where the biosynthesis of chlorophyll was blocked under Mo deficiency at low temperature, which led to the decrease of chlorophyll in winter wheat cultivars. The intermediates of chlorophyll biosynthesis were analyzed in winter wheat cultivars in soil culture, miniblock culture, and solution culture to study the effects of Mo on chlorophyll biosynthesis without Mo addition （CK, soil available Mo 0.112 mg kg^-1） and Mo addition （＋ Mo, 0.13 mg kg^-1 Mo was added）. Laevulinic acid （LA）, the competitive analog of δ-aminolaevulinic acid （ALA） was also introduced in the experiment. The ratio of Chl a/Chl b was constant between CK and ＋ Mo treatment, whereas it increased at low temperature, which indicated that Mo deficiency did not inhibit the transformation of Chl a to Chl b at low temperature. Under Mo deficiency, the contents of protochlorophyll （Pchl）, Mg-protoporphyrin Ⅸ （Mg-Proto Ⅸ）, protoporphyrin Ⅸ （proto IX）, and uroporphyrinogen Ⅲ （Uro Ⅲ） decreased [Uro Ⅲ decreased significantly （P 〈0.01）], whereas ALA and glutamate increased significantly （P 〈 0.01） compared with that of Mo addition, which suggested that the transformation from ALA to Uro Ⅲ might be inhibited. The content of ALA reversed after addition of LA, it was significantly higher （P 〈 0.01） in Mo addition than in CK. The results indicated that the transformation from ALA to Uro Ⅲ was blocked under Mo deficiency, which resulted in the inhibition of the biosynthesis of chlorophyll and led to the decrease of chlorophyll in winter wheat cultivars.展开更多
UroporphyrinogenⅢsynthetase(UROS)is an important enzyme involved in the structural formation of porphyrin,which is responsible for color intensity.A UROS homolog was isolated and characterized from the pearl mussel,H...UroporphyrinogenⅢsynthetase(UROS)is an important enzyme involved in the structural formation of porphyrin,which is responsible for color intensity.A UROS homolog was isolated and characterized from the pearl mussel,Hyriopsis cumingii(HcUros).The HcUros cDNA was 858 bp in length with an open reading frame that encoded a 285 amino acid protein,which contained a conserved HemD domain.HcUros exhibited widespread tissue distribution,displaying particular enrichment in the mantle and haemolymph of purple mussels,compared to white mussels.In situ hybridization of HcUros in mantle tissue demonstrated that it was specifically expressed in the dorsal epithelial cells of the mantle pallia.Additionally,HcUros expression was upregulated following implantation of the pearl sac to produce pearls.The data suggest that HcUros contributes to shell pigmentation,and nacre formation and coloring in H.cumingii.展开更多
[目的]探讨微小RNA548(mir548)和三价砷甲基转移酶(AS3MT)m RNA表达及其与砷甲基化代谢产物的关系。[方法]2011年9月采用整群抽样的方法选择云南某2个砷冶炼厂78名工人作为接触组,选择该地非接触砷作业居民23人为对照组。使用带砷预处...[目的]探讨微小RNA548(mir548)和三价砷甲基转移酶(AS3MT)m RNA表达及其与砷甲基化代谢产物的关系。[方法]2011年9月采用整群抽样的方法选择云南某2个砷冶炼厂78名工人作为接触组,选择该地非接触砷作业居民23人为对照组。使用带砷预处理系统的原子吸收分光光度法检测两组人群尿中的无机砷(i As)、甲基砷酸(MMA)和二甲基砷酸(DMA)含量,并计算相应的百分含量和一、二级甲基化指数;通过基因分析软件分析影响AS3MT的主要m RNA。实时荧光定量PCR检测研究对象外周血mir548和AS3MT m RNA表达。采用Spearman方法对各项指标进行相关分析。[结果]接触组尿中i As、MMA、DMA、一级甲基化指数和MMA%的中位数为134.54、235.88、563.57μg/g肌酐、1.61及19.01%,对照组为2.00、1.35、14.28μg/g肌酐、1.04及6.45%,接触组均高于对照组(P<0.05)。二级甲基化指数和DMA%则为接触组低于对照组(P<0.05),分别为3.41、61.98%和12.31、78.01%。接触组外周血mir548表达低于对照组(5.08±1.11与6.49±1.68),AS3MT m RNA表达水平高于对照组(10.71±2.52与9.19±2.11),均P<0.01。相关分析发现:外周血淋巴细胞mir548与AS3MT m RNA表达及i As、MMA、DMA及MMA%呈负相关关系(P<0.01);外周血AS3MT m RNA表达与尿中i As、MMA、DMA、MMA%及外周血mir548表达与DMA%均呈正相关关系(P<0.01)。[结论]mir548与AS3MT m RNA表达有负相关,两者与砷不同甲基化代谢产物浓度和百分含量存在关联。展开更多
基金This study was financed by National Natural Science Foundation of China(NSFC,30070431 and 39770428)the Key Project under Nineth Five-Year Plan of China Agricultural Administration(Agriculture 95-18-04).
文摘The objective was to probe the site where the biosynthesis of chlorophyll was blocked under Mo deficiency at low temperature, which led to the decrease of chlorophyll in winter wheat cultivars. The intermediates of chlorophyll biosynthesis were analyzed in winter wheat cultivars in soil culture, miniblock culture, and solution culture to study the effects of Mo on chlorophyll biosynthesis without Mo addition （CK, soil available Mo 0.112 mg kg^-1） and Mo addition （＋ Mo, 0.13 mg kg^-1 Mo was added）. Laevulinic acid （LA）, the competitive analog of δ-aminolaevulinic acid （ALA） was also introduced in the experiment. The ratio of Chl a/Chl b was constant between CK and ＋ Mo treatment, whereas it increased at low temperature, which indicated that Mo deficiency did not inhibit the transformation of Chl a to Chl b at low temperature. Under Mo deficiency, the contents of protochlorophyll （Pchl）, Mg-protoporphyrin Ⅸ （Mg-Proto Ⅸ）, protoporphyrin Ⅸ （proto IX）, and uroporphyrinogen Ⅲ （Uro Ⅲ） decreased [Uro Ⅲ decreased significantly （P 〈0.01）], whereas ALA and glutamate increased significantly （P 〈 0.01） compared with that of Mo addition, which suggested that the transformation from ALA to Uro Ⅲ might be inhibited. The content of ALA reversed after addition of LA, it was significantly higher （P 〈 0.01） in Mo addition than in CK. The results indicated that the transformation from ALA to Uro Ⅲ was blocked under Mo deficiency, which resulted in the inhibition of the biosynthesis of chlorophyll and led to the decrease of chlorophyll in winter wheat cultivars.
基金the National Key R&D Program of China(2018YFD0901406)the National Natural Science Foundation of China(31872565)sponsored by the Program of the Shanghai Academic Research Leader(19XD1421500).
文摘UroporphyrinogenⅢsynthetase(UROS)is an important enzyme involved in the structural formation of porphyrin,which is responsible for color intensity.A UROS homolog was isolated and characterized from the pearl mussel,Hyriopsis cumingii(HcUros).The HcUros cDNA was 858 bp in length with an open reading frame that encoded a 285 amino acid protein,which contained a conserved HemD domain.HcUros exhibited widespread tissue distribution,displaying particular enrichment in the mantle and haemolymph of purple mussels,compared to white mussels.In situ hybridization of HcUros in mantle tissue demonstrated that it was specifically expressed in the dorsal epithelial cells of the mantle pallia.Additionally,HcUros expression was upregulated following implantation of the pearl sac to produce pearls.The data suggest that HcUros contributes to shell pigmentation,and nacre formation and coloring in H.cumingii.
文摘[目的]探讨微小RNA548(mir548)和三价砷甲基转移酶(AS3MT)m RNA表达及其与砷甲基化代谢产物的关系。[方法]2011年9月采用整群抽样的方法选择云南某2个砷冶炼厂78名工人作为接触组,选择该地非接触砷作业居民23人为对照组。使用带砷预处理系统的原子吸收分光光度法检测两组人群尿中的无机砷(i As)、甲基砷酸(MMA)和二甲基砷酸(DMA)含量,并计算相应的百分含量和一、二级甲基化指数;通过基因分析软件分析影响AS3MT的主要m RNA。实时荧光定量PCR检测研究对象外周血mir548和AS3MT m RNA表达。采用Spearman方法对各项指标进行相关分析。[结果]接触组尿中i As、MMA、DMA、一级甲基化指数和MMA%的中位数为134.54、235.88、563.57μg/g肌酐、1.61及19.01%,对照组为2.00、1.35、14.28μg/g肌酐、1.04及6.45%,接触组均高于对照组(P<0.05)。二级甲基化指数和DMA%则为接触组低于对照组(P<0.05),分别为3.41、61.98%和12.31、78.01%。接触组外周血mir548表达低于对照组(5.08±1.11与6.49±1.68),AS3MT m RNA表达水平高于对照组(10.71±2.52与9.19±2.11),均P<0.01。相关分析发现:外周血淋巴细胞mir548与AS3MT m RNA表达及i As、MMA、DMA及MMA%呈负相关关系(P<0.01);外周血AS3MT m RNA表达与尿中i As、MMA、DMA、MMA%及外周血mir548表达与DMA%均呈正相关关系(P<0.01)。[结论]mir548与AS3MT m RNA表达有负相关,两者与砷不同甲基化代谢产物浓度和百分含量存在关联。
