以24月龄紫刺参作为研究对象,采用回归分析的方法,研究紫刺参养殖形态性状与体质量的关系。为获得更精确的形态性状与体质量(TW)的关系,将紫刺参体长(L)、体宽(W)和理论体长Le[由SLW(square root of the length-width,√L×W)转换而...以24月龄紫刺参作为研究对象,采用回归分析的方法,研究紫刺参养殖形态性状与体质量的关系。为获得更精确的形态性状与体质量(TW)的关系,将紫刺参体长(L)、体宽(W)和理论体长Le[由SLW(square root of the length-width,√L×W)转换而来]分别与体质量进行拟合,筛选评价紫刺参形态性状与体质量关系的最佳形态参数和曲线模型。结果显示,紫刺参体长、体宽、SLW和体质量等各性状的变异系数(CV)在31.52%~66.85%波动,体质量的变异系数最大,SLW的变异系数最小。回归分析表明,紫刺参各形态性状与体质量关系的最优拟合模型均为幂函数,且理论体长Le是描述紫刺参形态性状-体质量关系的最优形态指标;紫刺参为负异速生长模式,即形态性状的增长快于体质量的增加。研究结果可为紫刺参的生长规律研究和养殖管理提供科学依据和参考资料。展开更多
[Objective] This study was conducted to evaluate the associations of many characters of male sterile lines in Brassica napus L.[Method]10 recessive genetic male sterile（RGMS）lines were used as parents to cross in a ...[Objective] This study was conducted to evaluate the associations of many characters of male sterile lines in Brassica napus L.[Method]10 recessive genetic male sterile（RGMS）lines were used as parents to cross in a half diallel cross method to produce 45 single cross hybrids.These 45 crosses and their 10 parents were evaluated at Guiyang during 2007-2008.[Result]The positive correlations of seed yield with plant height,pods per plant,days to flowering and days to maturity were significant.Their respective correlation coefficients（r）were 0.644,0.583,0.281 and 0.341.Highly significant and negative correlation was observed between seeds per pod and seed size（-0.533）.Direct path coefficients were observed for pods per plant（0.556 2）,seeds per pod（0.407 4）,1 000-seed weight（0.481 3）,and plant height（0.401 7）to seed yield.[Conclusion]Pods per plant,seeds per pod,1 000-seed weight and plant height were positive correlated with seed yield and showed high direct contributions to yield.Other characters including branches per plant,days to flowering,days to maturity and oil content had low contributions to seed yield.展开更多
The superiority of wheat grain yield under no-till has been reported by many authors, and others reported significant interaction between wheat cultivar and tillage system for grain yield and other related traits. Hen...The superiority of wheat grain yield under no-till has been reported by many authors, and others reported significant interaction between wheat cultivar and tillage system for grain yield and other related traits. Hence, new breeding initiatives are needed to introgress favorable traits into wheat and other crops in areas where no-tillage is being adopted. The identification of such traits is solely possible via the assessment ofgermplasm under no-tillage. Moreover, Moroccan wheat breeding programs are carried out solely under conventional tillage system whilst the conservation one is becoming widely adopted. So, the ultimate objective of this research is to find out if the used wheat commercial cultivars behave differentially under no tillage system and to propose the use of appropriate cultivars for the appropriate tillage system and to implement a breeding program specifically for no tillage system. The experiment has been carried out during 2006-2007 at Douyet （F6s）. Cultivars have been sown according to a strip-split plot design. At maturity, yield, yield components and related traits have been recorded. The results indicated that both water regime （WR） and variety （Vat） had a highly significant effect on all measured traits. In contrast, tillage system （TS） had similar effect on yield, grains m-2, biomass, and plant height, but had no effect on harvest index, 1000-kernel weight and heading date. The TSxVar interaction has been significant to highly so on all traits except on heading date. The magnitude of the interaction for grain yield was more important under irrigated treatment than under rainfed one. On the whole, No Tillage yielded more grains than conventional one. Moreover, Achtar and Areal （bread wheat cultivars） and Marjana and Marzak （durum wheat cultivars） yielded more under No-Till. The significant interaction between TS and Var paves the way for the implementation of a breeding program under no till system.展开更多
Five molecular related indexes: MOL, SIM, d2, H0and PIC of 15 turbot parent pairs were estimated by using 10 SSR loci, which were used in correlation analysis with growth traits, DIL and DIW, of family filial from tho...Five molecular related indexes: MOL, SIM, d2, H0and PIC of 15 turbot parent pairs were estimated by using 10 SSR loci, which were used in correlation analysis with growth traits, DIL and DIW, of family filial from those 15 parent pairs.DIL and DIW were regressed on the MOL, SIM, d2, H0and PIC. Results showed MOL of five SSR loci(12, 17, 24, 81 and 85) and SIM of five loci(17, 21, 24, 81and 85) all shared significant positive correlation with DIL(r=0.482, P=0.035 and r=0.479, P=0.035, respectively); H0of six SSR loci(11, 17, 21, 24, 26 and 85) had significant positive correlation with DIW(r=0.551, P=0.017); PIC of two SSR loci(9and 26) had significant positive(r=0.519, P=0.024) correlation with DIL, while that and of four loci(17, 24, 27 and 85) had significant negative correlation(r=-0.519,P=0.024), with DIL. This present study suggested that filial growth expression could be predicted by using molecular related indexes in turbot breeding practice, and the accuracy of prediction depends on more SSR loci, especially associated with QTL.展开更多
Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept ...Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept of "isolation chromophore", "isolation group" and dendritic structure, a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship. For the small dendritic molecule D-NS, it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 °C, which extremely limits its real application. After introducing D-NS into a dendronized hyperbranched polymer chains, the obtained DHP-NS also shows a high d33 value of101 pm/V, but much better stability than D-NS. Even when its thin film was heated to 120 °C, no obvious decay can be observed in the d33 value of DHP-NS. This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.展开更多
文摘以24月龄紫刺参作为研究对象,采用回归分析的方法,研究紫刺参养殖形态性状与体质量的关系。为获得更精确的形态性状与体质量(TW)的关系,将紫刺参体长(L)、体宽(W)和理论体长Le[由SLW(square root of the length-width,√L×W)转换而来]分别与体质量进行拟合,筛选评价紫刺参形态性状与体质量关系的最佳形态参数和曲线模型。结果显示,紫刺参体长、体宽、SLW和体质量等各性状的变异系数(CV)在31.52%~66.85%波动,体质量的变异系数最大,SLW的变异系数最小。回归分析表明,紫刺参各形态性状与体质量关系的最优拟合模型均为幂函数,且理论体长Le是描述紫刺参形态性状-体质量关系的最优形态指标;紫刺参为负异速生长模式,即形态性状的增长快于体质量的增加。研究结果可为紫刺参的生长规律研究和养殖管理提供科学依据和参考资料。
基金the National Key Technology Research and Development Program of China(2021YFD2200405 to Z.C.)the National Natural Science Foundation of China(31270640and 31070532 to C.L.)the China Postdoctoral Science Foundation(2019M661489 to B.D.).
基金Supportd by the 11th Five Year Plan of Rapeseed Program in Guizhou Province,Scientific Contract of Guizhou N2(20053006-02-03)~~
文摘[Objective] This study was conducted to evaluate the associations of many characters of male sterile lines in Brassica napus L.[Method]10 recessive genetic male sterile（RGMS）lines were used as parents to cross in a half diallel cross method to produce 45 single cross hybrids.These 45 crosses and their 10 parents were evaluated at Guiyang during 2007-2008.[Result]The positive correlations of seed yield with plant height,pods per plant,days to flowering and days to maturity were significant.Their respective correlation coefficients（r）were 0.644,0.583,0.281 and 0.341.Highly significant and negative correlation was observed between seeds per pod and seed size（-0.533）.Direct path coefficients were observed for pods per plant（0.556 2）,seeds per pod（0.407 4）,1 000-seed weight（0.481 3）,and plant height（0.401 7）to seed yield.[Conclusion]Pods per plant,seeds per pod,1 000-seed weight and plant height were positive correlated with seed yield and showed high direct contributions to yield.Other characters including branches per plant,days to flowering,days to maturity and oil content had low contributions to seed yield.
基金The authors thank the staff of the INRA-CRRA Meknes, mainly the manager of Douyet Experimental station. This study was partially financed by the National Science Foundation of Spain （CICYT）： Grant No. AGL 2005-05767.
文摘The superiority of wheat grain yield under no-till has been reported by many authors, and others reported significant interaction between wheat cultivar and tillage system for grain yield and other related traits. Hence, new breeding initiatives are needed to introgress favorable traits into wheat and other crops in areas where no-tillage is being adopted. The identification of such traits is solely possible via the assessment ofgermplasm under no-tillage. Moreover, Moroccan wheat breeding programs are carried out solely under conventional tillage system whilst the conservation one is becoming widely adopted. So, the ultimate objective of this research is to find out if the used wheat commercial cultivars behave differentially under no tillage system and to propose the use of appropriate cultivars for the appropriate tillage system and to implement a breeding program specifically for no tillage system. The experiment has been carried out during 2006-2007 at Douyet （F6s）. Cultivars have been sown according to a strip-split plot design. At maturity, yield, yield components and related traits have been recorded. The results indicated that both water regime （WR） and variety （Vat） had a highly significant effect on all measured traits. In contrast, tillage system （TS） had similar effect on yield, grains m-2, biomass, and plant height, but had no effect on harvest index, 1000-kernel weight and heading date. The TSxVar interaction has been significant to highly so on all traits except on heading date. The magnitude of the interaction for grain yield was more important under irrigated treatment than under rainfed one. On the whole, No Tillage yielded more grains than conventional one. Moreover, Achtar and Areal （bread wheat cultivars） and Marjana and Marzak （durum wheat cultivars） yielded more under No-Till. The significant interaction between TS and Var paves the way for the implementation of a breeding program under no till system.
文摘Five molecular related indexes: MOL, SIM, d2, H0and PIC of 15 turbot parent pairs were estimated by using 10 SSR loci, which were used in correlation analysis with growth traits, DIL and DIW, of family filial from those 15 parent pairs.DIL and DIW were regressed on the MOL, SIM, d2, H0and PIC. Results showed MOL of five SSR loci(12, 17, 24, 81 and 85) and SIM of five loci(17, 21, 24, 81and 85) all shared significant positive correlation with DIL(r=0.482, P=0.035 and r=0.479, P=0.035, respectively); H0of six SSR loci(11, 17, 21, 24, 26 and 85) had significant positive correlation with DIW(r=0.551, P=0.017); PIC of two SSR loci(9and 26) had significant positive(r=0.519, P=0.024) correlation with DIL, while that and of four loci(17, 24, 27 and 85) had significant negative correlation(r=-0.519,P=0.024), with DIL. This present study suggested that filial growth expression could be predicted by using molecular related indexes in turbot breeding practice, and the accuracy of prediction depends on more SSR loci, especially associated with QTL.
基金supported by the Startup Research Fund of Zhengzhou University(1411320006)the National Natural Science Foundation of China(21325416,21274133)
文摘Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept of "isolation chromophore", "isolation group" and dendritic structure, a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship. For the small dendritic molecule D-NS, it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 °C, which extremely limits its real application. After introducing D-NS into a dendronized hyperbranched polymer chains, the obtained DHP-NS also shows a high d33 value of101 pm/V, but much better stability than D-NS. Even when its thin film was heated to 120 °C, no obvious decay can be observed in the d33 value of DHP-NS. This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.
