氮是植物生长发育过程中的关键营养元素之一,其吸收、转运与同化过程受到多种转录因子的精确调控。在bZIP转录因子家族中,TGACG基序结合因子(TGA)被证实对植物氮代谢具有核心调控功能。为明确其分子调控路径,本文系统综述了TGA转录因子...氮是植物生长发育过程中的关键营养元素之一,其吸收、转运与同化过程受到多种转录因子的精确调控。在bZIP转录因子家族中,TGACG基序结合因子(TGA)被证实对植物氮代谢具有核心调控功能。为明确其分子调控路径,本文系统综述了TGA转录因子的分子特征,重点阐述其在植物硝酸盐吸收、根系发育调控、氮同化过程中的核心功能,解析其通过水杨酸(SA)、茉莉酸(JA)/乙烯(ET)、脱落酸(ABA)激素信号通路及氧化还原修饰参与氮素代谢的分子机制。结果显示:(1)TGA转录因子属于bZIP家族D亚科,分5个亚族,在拟南芥、水稻等多种植物中高度保守;(2)通过激活NRT家族基因表达、调控根系发育,正向促进氮吸收与转运,且与NLP7(NIN-like protein 7)等因子形成调控网络;(3)通过激素信号互作与氧化还原修饰,响应低氮等胁迫,维持氮代谢稳态。综上,TGA转录因子是植物氮代谢调控网络的核心节点,通过多途径协同调控氮吸收、转运与同化。未来研究需结合多组学与基因编辑技术,解析TGA器官特异性功能、互作网络及物种差异,为作物氮高效利用的遗传改良提供理论基础与育种策略。展开更多
Thermogravimetric analysis/differential scanning calorimeter(TGA/DSC)technique along with basic coal characteristics study is carried out for eighty coal samples of Indian coalfields,to determine spontaneous combustio...Thermogravimetric analysis/differential scanning calorimeter(TGA/DSC)technique along with basic coal characteristics study is carried out for eighty coal samples of Indian coalfields,to determine spontaneous combustion propensity behaviour of coal.TGA study of coal samples indicates that there is an increase in the mass of coal samples in the temperature range 150-350℃,which may be due to oxygen adsorption and absorption.The correlation and principal component analysis states that the component of proximate analysis(Mad,VMd,FR,and VR)have an acceptable correlation with the TGA experiments results i.e.,Tgsh and Tgign.Multiple fixed nonlinear regression analysis shows that thermogravimetry(TG)experiment results Tgign may be the best index to categorise/classify the coal as per their susceptibility towards spontaneous combustion.The authors proposed four groups of classification as per their propensity towards spontaneous combustion depending upon the moisture(Mad),volatile matter(VMd),and TG ignition temperature from differential thermogravimetric(DTG)curve(Tgign)using hierarchal clustering analysis.The coal samples of different seams from Indian coalfield may be classified into four different clusters,viz.very highly/extremely susceptible(Tgign320℃).The field observations and TGA/DSC experiment results with the following statistical analysis substantiate a similar assessment.展开更多
摘要氮是植物生长发育过程中的关键营养元素之一,其吸收、转运与同化过程受到多种转录因子的精确调控。在bZIP转录因子家族中,TGACG基序结合因子(TGA)被证实对植物氮代谢具有核心调控功能。为明确其分子调控路径,本文系统综述了TGA转录因子的分子特征,重点阐述其在植物硝酸盐吸收、根系发育调控、氮同化过程中的核心功能,解析其通过水杨酸(SA)、茉莉酸(JA)/乙烯(ET)、脱落酸(ABA)激素信号通路及氧化还原修饰参与氮素代谢的分子机制。结果显示:(1)TGA转录因子属于bZIP家族D亚科,分5个亚族,在拟南芥、水稻等多种植物中高度保守;(2)通过激活NRT家族基因表达、调控根系发育,正向促进氮吸收与转运,且与NLP7(NIN-like protein 7)等因子形成调控网络;(3)通过激素信号互作与氧化还原修饰,响应低氮等胁迫,维持氮代谢稳态。综上,TGA转录因子是植物氮代谢调控网络的核心节点,通过多途径协同调控氮吸收、转运与同化。未来研究需结合多组学与基因编辑技术,解析TGA器官特异性功能、互作网络及物种差异,为作物氮高效利用的遗传改良提供理论基础与育种策略。
基金M/s CIL R&D Board,Kolkata(CIL/R&D/01/60/2016)for their financial support.
摘要Thermogravimetric analysis/differential scanning calorimeter(TGA/DSC)technique along with basic coal characteristics study is carried out for eighty coal samples of Indian coalfields,to determine spontaneous combustion propensity behaviour of coal.TGA study of coal samples indicates that there is an increase in the mass of coal samples in the temperature range 150-350℃,which may be due to oxygen adsorption and absorption.The correlation and principal component analysis states that the component of proximate analysis(Mad,VMd,FR,and VR)have an acceptable correlation with the TGA experiments results i.e.,Tgsh and Tgign.Multiple fixed nonlinear regression analysis shows that thermogravimetry(TG)experiment results Tgign may be the best index to categorise/classify the coal as per their susceptibility towards spontaneous combustion.The authors proposed four groups of classification as per their propensity towards spontaneous combustion depending upon the moisture(Mad),volatile matter(VMd),and TG ignition temperature from differential thermogravimetric(DTG)curve(Tgign)using hierarchal clustering analysis.The coal samples of different seams from Indian coalfield may be classified into four different clusters,viz.very highly/extremely susceptible(Tgign320℃).The field observations and TGA/DSC experiment results with the following statistical analysis substantiate a similar assessment.