Non-structural carbohydrates(NSCs)are critical for plant drought adaptation,but their environmental drivers under prolonged drought remains unclear.We investigated seasonal NSCs dynamics in the leaf,stem and root of P...Non-structural carbohydrates(NSCs)are critical for plant drought adaptation,but their environmental drivers under prolonged drought remains unclear.We investigated seasonal NSCs dynamics in the leaf,stem and root of Picea crass ifolia(Qinghai spruce)during the growing seasons of2021-2023 under intensifying drought at three altitudes in Qilian Mountains,Northwest China.Our results revealed synchronous seasonal patterns in soluble sugar,starch,and total non-structural carbohydrate within the same year,contrasting with marked altitudinal disparities.As drought progressed(from 2021 to 2023),soluble sugars initially increased(2022)then declined(2023),while starch showed consistent reduction(except leaves).Moreover,the altitude of peak NSCs concentrations shifted from 3200 m in 2021to 2700 m in 2023.In particular,prolonged drought alters the environmental factors affecting NSCs.NSCs demonstrated significant positive correlations with soil temperature during humid 2021,then negatively with air temperature,vapor pressure deficit,and precipitation during 2022's initial drought,whereas under 2023's persistent drought conditions,soil temperature and water content emerged as dominant drivers.Concurrently,the ratio of soluble sugar to starch transitioned from air temperature and precipitation associations(2021-2022)to soil parameter dependence in2023.These findings provide new insights into the seasonal carbon dynamics of Qinghai spruce and the environmental response mechanisms under increasing drought stress,contributing to a better understanding of tree physiological adaptations in drought stress.展开更多
目的基于大鼠骨形态发生蛋白2(bone morphogenetic protein2,BMP2)/Smad家族成员1(smad family member 1,Smad1)通路,探究重组人转化生长因子-β1(recombinant human transforming growth factor-β1,rhTGF-β1)对正畸牙移动(orthodonti...目的基于大鼠骨形态发生蛋白2(bone morphogenetic protein2,BMP2)/Smad家族成员1(smad family member 1,Smad1)通路,探究重组人转化生长因子-β1(recombinant human transforming growth factor-β1,rhTGF-β1)对正畸牙移动(orthodontic tooth movement,OMT)大鼠破骨细胞形成的影响。方法构建大鼠OTM模型,采用显微CT(Micro-CT)分析测定OTM的距离;通过抗酒石酸酸性磷酸酶(tartrate-resistant acid phosphatase,TRAP)染色评估压力侧破骨细胞活性;苏木精-伊红(hematoxylin and eosin,HE)染色评估压力侧组织形态学特征,免疫组化(immunohistochemistry,IHC)染色和蛋白质印迹(Western blot)测定相关蛋白表达水平。结果与正常组相比,Model组大鼠OTM距离增加(P<0.01),牙周间隙明显变窄并出现吸收陷窝,压力侧的基质金属蛋白酶-9(matrix metalloproteinases-9,MMP-9)、核因子κB受体活化因子配体(receptor activator of nuclear factor kappa B ligand,RANKL)增加(P<0.01)、骨保护素(osteoprotegerin,OPG)表达降低(P<0.01),BMP2/Smad1信号通路被激活(P<0.01)。经BMP2抑制剂Noggin处理后,与Model组相比,BMP2、p-Smad1表达显著降低(P<0.01),OTM距离显著降低(P<0.01),且压力侧的TRAP、MMP-9及RANKL表达均显著降低(P<0.01),OPG升高(P<0.01)。经rhTGF-β1处理的大鼠中,较Model组OTM距离显著增加(P<0.01),TRAP阳性多核细胞数量升高(P<0.01),压力侧的MMP-9及RANKL表达均显著升高(P<0.05)、OPG表达显著降低(P<0.01),且BMP2、p-Smad1表达上调(P<0.01)。此外,rhTGF-β1+Noggin组部分逆转了rhTGF-β1组大鼠的破骨细胞数量的增加效应(P<0.01)。结论正畸力可促进破骨细胞形成,且rhTGF-β1可通过BMP2/Smad1信号通路增强OTM过程中破骨细胞的形成。展开更多
目的采用薄膜分散-超声法制备磁性颗粒(bacterial magnetic particles,BMPs)脂质体,考察BMPs浓度、超声功率和超声时间等因素对BMPs磁性脂质体粒径的影响。方法薄膜分散-超声法制备BMPs脂质体,调节BMPs浓度、超声功率和超声时间等因素,...目的采用薄膜分散-超声法制备磁性颗粒(bacterial magnetic particles,BMPs)脂质体,考察BMPs浓度、超声功率和超声时间等因素对BMPs磁性脂质体粒径的影响。方法薄膜分散-超声法制备BMPs脂质体,调节BMPs浓度、超声功率和超声时间等因素,激光散射粒度仪测定磁性脂质体粒径。结果以薄膜分散-超声法制备的BMPs脂质体,BMPs浓度在(20～60)μg/mL时,磁性脂质体粒径基本稳定,平均94.9 nm;BMPs浓度在(60～100)μg/mL时,磁性脂质体粒径随着BMPs浓度增加而有增大的趋势。超声功率的增加或超声有效时间增大时,磁性脂质体的平均粒径有减小趋势,当超声功率为300 W、有效超声时间为100 s时,粒径出现最小值;但其后都存在转折,随着超声功率的再增加或超声有效时间再增大时,平均粒径反而出现增大现象。结论薄膜分散-超声法制备BMPs脂质体,通过控制BMPs浓度、超声功率和超声时间等因素,可以对磁性脂质体粒径进行调节。展开更多
[Objective] The aim was to compare the content changes between the non-structural carbohydrates（NSC）and the total nitrogen in various growing seasons,and to explore the response relationship between altitude and the...[Objective] The aim was to compare the content changes between the non-structural carbohydrates（NSC）and the total nitrogen in various growing seasons,and to explore the response relationship between altitude and the contents.[Method] Taking Quercus aquifolioides scrub which widely distributed in Zheduoshan in the west of Sichuan as the experimental objects,the changes between NSC and the toal nitrogen in various growing seasons at different altitude were studied.[Result] The results showed that the content of NSC in Quercus aquifolioides underground increased with the lift of elevation in the dormancy,but decreased in the early germination,growing period and growth stage.The content of NSC in the ground tissue changed non-linearly with increasing elevation.In addition,the total nitrogen of Quercus aquifolioides organizations was decreasing with increasing elevation in the dormant period,which did not change significantly in the other periods.This result implied that the content of NSC in Quercus aquifolioides underground was more sensitive to temperature.[Conclusion] The experiment laid basis for the exploration of the physical and ecological mechanism of underground plants adaptability to highland environment,their response to global climate changes and adjustment to high altitude ecological system.展开更多
基金supported by the National Natural Science Foundation of China(No.42277481,42007410,32271667,42207537)。
文摘Non-structural carbohydrates(NSCs)are critical for plant drought adaptation,but their environmental drivers under prolonged drought remains unclear.We investigated seasonal NSCs dynamics in the leaf,stem and root of Picea crass ifolia(Qinghai spruce)during the growing seasons of2021-2023 under intensifying drought at three altitudes in Qilian Mountains,Northwest China.Our results revealed synchronous seasonal patterns in soluble sugar,starch,and total non-structural carbohydrate within the same year,contrasting with marked altitudinal disparities.As drought progressed(from 2021 to 2023),soluble sugars initially increased(2022)then declined(2023),while starch showed consistent reduction(except leaves).Moreover,the altitude of peak NSCs concentrations shifted from 3200 m in 2021to 2700 m in 2023.In particular,prolonged drought alters the environmental factors affecting NSCs.NSCs demonstrated significant positive correlations with soil temperature during humid 2021,then negatively with air temperature,vapor pressure deficit,and precipitation during 2022's initial drought,whereas under 2023's persistent drought conditions,soil temperature and water content emerged as dominant drivers.Concurrently,the ratio of soluble sugar to starch transitioned from air temperature and precipitation associations(2021-2022)to soil parameter dependence in2023.These findings provide new insights into the seasonal carbon dynamics of Qinghai spruce and the environmental response mechanisms under increasing drought stress,contributing to a better understanding of tree physiological adaptations in drought stress.
文摘目的基于大鼠骨形态发生蛋白2(bone morphogenetic protein2,BMP2)/Smad家族成员1(smad family member 1,Smad1)通路,探究重组人转化生长因子-β1(recombinant human transforming growth factor-β1,rhTGF-β1)对正畸牙移动(orthodontic tooth movement,OMT)大鼠破骨细胞形成的影响。方法构建大鼠OTM模型,采用显微CT(Micro-CT)分析测定OTM的距离;通过抗酒石酸酸性磷酸酶(tartrate-resistant acid phosphatase,TRAP)染色评估压力侧破骨细胞活性;苏木精-伊红(hematoxylin and eosin,HE)染色评估压力侧组织形态学特征,免疫组化(immunohistochemistry,IHC)染色和蛋白质印迹(Western blot)测定相关蛋白表达水平。结果与正常组相比,Model组大鼠OTM距离增加(P<0.01),牙周间隙明显变窄并出现吸收陷窝,压力侧的基质金属蛋白酶-9(matrix metalloproteinases-9,MMP-9)、核因子κB受体活化因子配体(receptor activator of nuclear factor kappa B ligand,RANKL)增加(P<0.01)、骨保护素(osteoprotegerin,OPG)表达降低(P<0.01),BMP2/Smad1信号通路被激活(P<0.01)。经BMP2抑制剂Noggin处理后,与Model组相比,BMP2、p-Smad1表达显著降低(P<0.01),OTM距离显著降低(P<0.01),且压力侧的TRAP、MMP-9及RANKL表达均显著降低(P<0.01),OPG升高(P<0.01)。经rhTGF-β1处理的大鼠中,较Model组OTM距离显著增加(P<0.01),TRAP阳性多核细胞数量升高(P<0.01),压力侧的MMP-9及RANKL表达均显著升高(P<0.05)、OPG表达显著降低(P<0.01),且BMP2、p-Smad1表达上调(P<0.01)。此外,rhTGF-β1+Noggin组部分逆转了rhTGF-β1组大鼠的破骨细胞数量的增加效应(P<0.01)。结论正畸力可促进破骨细胞形成,且rhTGF-β1可通过BMP2/Smad1信号通路增强OTM过程中破骨细胞的形成。
基金Supported by National Natural Science Fund(30872017)China Science Academy Knowledge Innovation Engineering Project Important Direction Program(KZCX2-YW-331-3,KSCX2-YW-N-066)Central University Basic Science Research Operation Special Fund(XDJK2009C110)~~
文摘[Objective] The aim was to compare the content changes between the non-structural carbohydrates（NSC）and the total nitrogen in various growing seasons,and to explore the response relationship between altitude and the contents.[Method] Taking Quercus aquifolioides scrub which widely distributed in Zheduoshan in the west of Sichuan as the experimental objects,the changes between NSC and the toal nitrogen in various growing seasons at different altitude were studied.[Result] The results showed that the content of NSC in Quercus aquifolioides underground increased with the lift of elevation in the dormancy,but decreased in the early germination,growing period and growth stage.The content of NSC in the ground tissue changed non-linearly with increasing elevation.In addition,the total nitrogen of Quercus aquifolioides organizations was decreasing with increasing elevation in the dormant period,which did not change significantly in the other periods.This result implied that the content of NSC in Quercus aquifolioides underground was more sensitive to temperature.[Conclusion] The experiment laid basis for the exploration of the physical and ecological mechanism of underground plants adaptability to highland environment,their response to global climate changes and adjustment to high altitude ecological system.
