Analysis of genetic progress for lodging-related traits provides important information for further improvement of lodging resistance.Forty winter wheat cultivars widely grown in the Yellow-Huai River Valleys Winter Wh...Analysis of genetic progress for lodging-related traits provides important information for further improvement of lodging resistance.Forty winter wheat cultivars widely grown in the Yellow-Huai River Valleys Winter Wheat Zone(YHWZ)of China during the period of 1964–2015 were evaluated for several lodging-related traits in three cropping seasons.Plant height,height at center of gravity,length of the basal second internode,and lodging index decreased significantly in this period,and the average annual genetic gains for these traits were–0.50 cm or–0.62%,–0.27 cm or–0.60%,–0.06 cm or–0.63%,and–0.01 or–0.94%,respectively.Different from other traits,stem strength showed a significant increasing trend with the breeding period,and the annual genetic gains were 0.03 N or 0.05%.Correlation analysis showed that lodging index was positively correlated with plant height,height at center of gravity,and length of the basal second internode,but negatively correlated with stem strength.Meanwhile,significantly positive correlations were observed between plant height,height at center of gravity,and length of the basal first and second internodes.By comparison with the wild types,dwarfing genes had significant effects on all lodging-related traits studied except for length of the basal first internode and stem strength.Principle component analysis demonstrated that plant height and stem strength were the most important factors influencing lodging resistance.Clustering analysis based on the first two principle components further indicated the targets of wheat lodging-resistant breeding have changed from reducing plant height to strengthening stem strength over the breeding periods.This study indicates that the increase of stem strength is vital to improve lodging resistance in this region under the high-yielding condition when plant height is in an optimal range.展开更多
Porous cellulose beads modified by histidine (PCBH) were prepared. The adsorption capacity of PCBH for divalent Mg(II), Cu(II), Pb(II) and Hg(II) ions were determined. The effects of the temperature, the initial pH va...Porous cellulose beads modified by histidine (PCBH) were prepared. The adsorption capacity of PCBH for divalent Mg(II), Cu(II), Pb(II) and Hg(II) ions were determined. The effects of the temperature, the initial pH value, the concentration of metal ion and PCBH ligand on the adsorption of Cu(II) Hg (II) were discussed. The adsorption process fitted to Freundlich adsorption isotherms for both metal ions. Adsorption rate constants were also found.展开更多
Two chiral fluorescent receptors 1 and 2 based on(R)-1,1'-binaphthylene-2,2’bisthiourea were synthesized,and their chiral rec ognition properties for enan tiomeric man delate anions were studied by fluorescence s...Two chiral fluorescent receptors 1 and 2 based on(R)-1,1'-binaphthylene-2,2’bisthiourea were synthesized,and their chiral rec ognition properties for enan tiomeric man delate anions were studied by fluorescence spectra an d mo。lecular modeling.Addition of the L-and D-mandelate anions caused considerable fluorescent increases in the fluo。rescent intensity of the host solution.The L-enantiomer can enhance the fluorescence intensity of 1 much more than the D.enantiomer can do,and 1 shows a better enantioselective recognition ability than 2.展开更多
A thiourea-based tripodal colorimetric anion sensor was synthesized.Its binding abilities with AcO—and halide anions in DM SO were studied by UV—Vis spectra.The sensor showed diferent color responses to these anions...A thiourea-based tripodal colorimetric anion sensor was synthesized.Its binding abilities with AcO—and halide anions in DM SO were studied by UV—Vis spectra.The sensor showed diferent color responses to these anions.Th e association constants an d diferent stoichiomelries were ded uced by nonlinear least—square curve fitting or linear fit—ting.展开更多
The development of new receptors that can recog-nize neutral and charged species has attracted consider-able interest in the recent year.1 Despite receptors forcation have been studied for more than four decades,thede...The development of new receptors that can recog-nize neutral and charged species has attracted consider-able interest in the recent year.1 Despite receptors forcation have been studied for more than four decades,thedesign and synthesis of anion receptors are still rare be-cause of manifold structures of anions.2 Anions such asfluoride,chloride,phosphate and carboxylate ions playcrucial roles in a range of biological phenomena and areimplicated in many disease states.3 In particular,fluo-ride is beneficial to human physiology such as preven-tion of dental caries4 etc.Recently,some good receptorsfor fluoride have been reported being based oncalix[4]pyrrole,5 dipyrroly quinoxaline6 and its metalcoordination,7 naphthalene urea derivative,8 diamidofu-ran,9 biaryl thiourea derivative.展开更多
基金supported by the National Key Research and Development Program of China (2016YFD0101600 and 2016YFD0100102)the National Natural Science Foundation of China (31401468 and 31771881)the Innovation Team and the National Engineering Laboratory of Crop Molecular Breeding of Chinese Academy of Agricultural Sciences
文摘Analysis of genetic progress for lodging-related traits provides important information for further improvement of lodging resistance.Forty winter wheat cultivars widely grown in the Yellow-Huai River Valleys Winter Wheat Zone(YHWZ)of China during the period of 1964–2015 were evaluated for several lodging-related traits in three cropping seasons.Plant height,height at center of gravity,length of the basal second internode,and lodging index decreased significantly in this period,and the average annual genetic gains for these traits were–0.50 cm or–0.62%,–0.27 cm or–0.60%,–0.06 cm or–0.63%,and–0.01 or–0.94%,respectively.Different from other traits,stem strength showed a significant increasing trend with the breeding period,and the annual genetic gains were 0.03 N or 0.05%.Correlation analysis showed that lodging index was positively correlated with plant height,height at center of gravity,and length of the basal second internode,but negatively correlated with stem strength.Meanwhile,significantly positive correlations were observed between plant height,height at center of gravity,and length of the basal first and second internodes.By comparison with the wild types,dwarfing genes had significant effects on all lodging-related traits studied except for length of the basal first internode and stem strength.Principle component analysis demonstrated that plant height and stem strength were the most important factors influencing lodging resistance.Clustering analysis based on the first two principle components further indicated the targets of wheat lodging-resistant breeding have changed from reducing plant height to strengthening stem strength over the breeding periods.This study indicates that the increase of stem strength is vital to improve lodging resistance in this region under the high-yielding condition when plant height is in an optimal range.
文摘Porous cellulose beads modified by histidine (PCBH) were prepared. The adsorption capacity of PCBH for divalent Mg(II), Cu(II), Pb(II) and Hg(II) ions were determined. The effects of the temperature, the initial pH value, the concentration of metal ion and PCBH ligand on the adsorption of Cu(II) Hg (II) were discussed. The adsorption process fitted to Freundlich adsorption isotherms for both metal ions. Adsorption rate constants were also found.
基金supported by the National Natural Science Foundation of China(No.20372054)
文摘Two chiral fluorescent receptors 1 and 2 based on(R)-1,1'-binaphthylene-2,2’bisthiourea were synthesized,and their chiral rec ognition properties for enan tiomeric man delate anions were studied by fluorescence spectra an d mo。lecular modeling.Addition of the L-and D-mandelate anions caused considerable fluorescent increases in the fluo。rescent intensity of the host solution.The L-enantiomer can enhance the fluorescence intensity of 1 much more than the D.enantiomer can do,and 1 shows a better enantioselective recognition ability than 2.
基金supported by the National Natural Science Foundation of China(No.20372054).
文摘A thiourea-based tripodal colorimetric anion sensor was synthesized.Its binding abilities with AcO—and halide anions in DM SO were studied by UV—Vis spectra.The sensor showed diferent color responses to these anions.Th e association constants an d diferent stoichiomelries were ded uced by nonlinear least—square curve fitting or linear fit—ting.
基金supported by the National Natural Science Foundation of China(No.20372054)
文摘The development of new receptors that can recog-nize neutral and charged species has attracted consider-able interest in the recent year.1 Despite receptors forcation have been studied for more than four decades,thedesign and synthesis of anion receptors are still rare be-cause of manifold structures of anions.2 Anions such asfluoride,chloride,phosphate and carboxylate ions playcrucial roles in a range of biological phenomena and areimplicated in many disease states.3 In particular,fluo-ride is beneficial to human physiology such as preven-tion of dental caries4 etc.Recently,some good receptorsfor fluoride have been reported being based oncalix[4]pyrrole,5 dipyrroly quinoxaline6 and its metalcoordination,7 naphthalene urea derivative,8 diamidofu-ran,9 biaryl thiourea derivative.
