[Objective] The aim was to carry out the genetic analysis on plant height of rice（Oryza sativa L.）cultivated in different seasons.[Method] Three rice parents with great difference in plant height including CB1（83.1...[Objective] The aim was to carry out the genetic analysis on plant height of rice（Oryza sativa L.）cultivated in different seasons.[Method] Three rice parents with great difference in plant height including CB1（83.1 cm）,CB4（105.5 cm）and CB7（115.6 cm）were chosen to construct two parental combinations：CB1×CB4 and CB7×CB4,and the corresponding filial generations P1,F1,P2,B1,B2 and F2 were obtained.The 6 populations were planted in middle and late seasons respectively to measure their height traits.The Akaike＇s information criterion（AIC）of the mixed major gene and polygene model was used to indentify the existence of major genes affecting quantitative traits in B1,B2,F2 populations.When the major genes existed,the genetic effects of the major genes and polygenes and their genetic variance were estimated through segregation analysis.[Result] One additive major gene plus additive-dominance polygenes was the most fitted genetic model for the trait in all B1,B2,F2 populations in two planting seasons.The heritability values of the major genes varied from 38.63% to 78.53% and those of polygenes varied from 1.72% to 36.04%,and the total heritability values were 45.52-92.93%.The additive effect d value of the two genetic populations under two planting seasons was-4.56,-9.16,-7.19,and-9.38,respectively,as suggested that additive effect of the major genes would decrease the express of the plant height trait.[Conclusion] The heritability of plant height trait was affected by planting seasons and the combinations clearly as a whole.展开更多
为了提升采煤机运行安全性与稳定性,以MG300-700-AWD型采煤机为研究对象,通过有限元法对采煤机平滑靴与中部槽接触碰撞特性进行了研究。研究发现,中部槽安装间隙量与高度差是影响平滑靴接触碰撞特性的重要因素,随着安装间隙量与高度差...为了提升采煤机运行安全性与稳定性,以MG300-700-AWD型采煤机为研究对象,通过有限元法对采煤机平滑靴与中部槽接触碰撞特性进行了研究。研究发现,中部槽安装间隙量与高度差是影响平滑靴接触碰撞特性的重要因素,随着安装间隙量与高度差的提高,平滑靴碰撞特性应力升高,当安装间隙量超过30 mm,平滑靴产生的接触力会超过ZG25CrMn Ni Mo许用应力的222.67 MPa,增加平滑靴碰撞损伤的危险。采煤机运行过程中应注重安装间隙量与高度差的控制,通过实践应用验证了模拟分析结果的合理性,将安装间隙量与高度差控制在较低水平范围内,可保证整个采煤机稳定运行,有利于煤矿开采工作更好地开展。展开更多
基金Supported by the Science and Technology Project of Food Production in Jiangxi Province(2006BAD02A04)~~
文摘[Objective] The aim was to carry out the genetic analysis on plant height of rice（Oryza sativa L.）cultivated in different seasons.[Method] Three rice parents with great difference in plant height including CB1（83.1 cm）,CB4（105.5 cm）and CB7（115.6 cm）were chosen to construct two parental combinations：CB1×CB4 and CB7×CB4,and the corresponding filial generations P1,F1,P2,B1,B2 and F2 were obtained.The 6 populations were planted in middle and late seasons respectively to measure their height traits.The Akaike＇s information criterion（AIC）of the mixed major gene and polygene model was used to indentify the existence of major genes affecting quantitative traits in B1,B2,F2 populations.When the major genes existed,the genetic effects of the major genes and polygenes and their genetic variance were estimated through segregation analysis.[Result] One additive major gene plus additive-dominance polygenes was the most fitted genetic model for the trait in all B1,B2,F2 populations in two planting seasons.The heritability values of the major genes varied from 38.63% to 78.53% and those of polygenes varied from 1.72% to 36.04%,and the total heritability values were 45.52-92.93%.The additive effect d value of the two genetic populations under two planting seasons was-4.56,-9.16,-7.19,and-9.38,respectively,as suggested that additive effect of the major genes would decrease the express of the plant height trait.[Conclusion] The heritability of plant height trait was affected by planting seasons and the combinations clearly as a whole.
文摘为了提升采煤机运行安全性与稳定性,以MG300-700-AWD型采煤机为研究对象,通过有限元法对采煤机平滑靴与中部槽接触碰撞特性进行了研究。研究发现,中部槽安装间隙量与高度差是影响平滑靴接触碰撞特性的重要因素,随着安装间隙量与高度差的提高,平滑靴碰撞特性应力升高,当安装间隙量超过30 mm,平滑靴产生的接触力会超过ZG25CrMn Ni Mo许用应力的222.67 MPa,增加平滑靴碰撞损伤的危险。采煤机运行过程中应注重安装间隙量与高度差的控制,通过实践应用验证了模拟分析结果的合理性,将安装间隙量与高度差控制在较低水平范围内,可保证整个采煤机稳定运行,有利于煤矿开采工作更好地开展。
