多性状模糊综合评判的变量分析方法     

张仲保 《西北农业学报》1996,5(4):79-81

在随机区组设计的作物品比试验中，对参试品种诸性状逐一进行方差分析，剔除所有不显著性状，对差异显著性状，在每一区组间，根据不同的模糊分布规律及其权重大小，求出模糊总值，对不同品种各区组模糊总值进行方差分析和多重比较，做出科学合理的综合评价。  相似文献   

Genetic Dissection of Grain Size Traits Through Genome-Wide Association Study Based on Genic Markers in Rice     

Amrit Kumar Nayak  Anilkumar C  Sasmita Behera  Rameswar Prasad Sah  Gera Roopa Lavanya  Awadhesh Kumar  Lambodar Behera  Muhammed Azharudheen Tp 《水稻科学》2022,29(5):462-472

Grain size plays a significant role in rice, starting from affecting yield to consumer preference, which is the driving force for deep investigation and improvement of grain size characters. Quantitative inheritance makes these traits complex to breed on account of several alleles contributing to the complete trait expression. We employed genome-wide association study in an association panel of 88 rice genotypes using 142 new candidate gene based SSR (cgSSR) markers, derived from yield-related candidate genes, with the efficient mixed-model association coupled mixed linear model for dissecting complete genetic control of grain size traits. A total of 10 significant associations were identified for four grain size-related characters (grain weight, grain length, grain width, and length-width ratio). Among the identified associations, seven marker trait associations explain more than 10% of the phenotypic variation, indicating major putative QTLs for respective traits. The allelic variations at genes OsBC1L4, SHO1 and OsD2 showed association between 1000-grain weight and grain width, 1000-grain weight and grain length, and grain width and length-width ratio, respectively. The cgSSR markers, associated with corresponding traits, can be utilized for direct allelic selection, while other significantly associated cgSSRs may be utilized for allelic accumulation in the breeding programs or grain size improvement. The new cgSSR markers associated with grain size related characters have a significant impact on practical plant breeding to increase the number of causative alleles for these traits through marker aided rice breeding programs.  相似文献   

思茅松树高曲线方程中的异方差研究   总被引：3，自引：0，他引：3  

吴明山  胥辉 《林业调查规划》2007,32(2):1-3,6

运用残差图法和戈德菲尔特-夸检验方法检验出思茅松树高曲线方程中存在异方差现象.应用树高曲线方程本身为权函数对曲线方程进行加权,结果表明加权估计能够很好地消除思茅松树高曲线方程中的异方差问题,使曲线方程中的参数更加稳定,预估精度提高,应用性增强.  相似文献   

遥感数据参数反演估计南京紫金山缺失小班蓄积量方法研究     

吴翼  李明阳 《林业调查规划》2008,33(1):1-3

如何对早期小班调查蓄积量缺失的数据进行修补,是进行森林资源动态分析急需解决的一个问题.以南京紫金山1988年森林经理调查数据和同期TM遥感数据为信息源,利用遥感生物参数反演技术,根据已知小班的光谱特征和蓄积量之间的相关关系,在建立蓄积量生物参数反演经验模型的基础上,对缺失小班蓄积量进行修补.研究表明:通过遥感数据生物参数反演进行缺失小班蓄积量数据修补的方法得到的小班蓄积量数据可靠性比较高,这种方法在森林资源调查和规划实践中具有较大的应用价值.  相似文献   

系统误差模型下估计的性质     

刘天鹏  李春红  邹建艳 《西南大学学报(自然科学版)》2011,33(1)

在含有系统误差的线性回归模型Yn=Xnβ+Iη+e里,研究了η和β估计的性质.当随机误差和设计矩阵满足一定的条件时,分别给出了∧η(n)和c′∧β(n)弱相合性的证明.在η和d′β各自对应的线性无偏估计类中,证明了∧(ηn)和d′∧β(n)是唯一具有最小方差的估计.  相似文献