论文部分内容阅读
利用叶绿素荧光仪测定了26份青贮玉米自交系和105个组合的叶绿素含量及荧光动力学参数,对其生理性状关键耐旱指标进行主成分及相关分析,并进行配合力及遗传参数分析。青贮玉米Fv/Fm的影响因素大小依次为:叶片Fv>叶片Fm>叶片Fo>叶片Area>叶片SPAD>苞叶Fv/Fm>苞叶SPAD。筛选出了5个关键指标(叶片Fm、叶片Fv、叶片Area、叶片Fv/Fm、叶片SPAD)及一般配合力(GCA)较高的9份自交系和特殊配合力(SCA)较高的19个组合。在F1吐丝期,叶片Fo、叶片Area主要受基因加性效应支配;叶片Fm、叶片Fv的加性与非加性效应相当;叶片Fv/Fm、叶片SPAD主要受基因非加性效应支配。狭义遗传力(h2N)大小依次为:叶片SPAD>叶片Area>叶片Fo>叶片Fv>叶片Fm>叶片Fv/Fm。通过对叶片Fv的早代正向直接选择、叶片Fo的早代负向直接选择,以及对叶片Fv/Fm的杂种优势利用,可提高旱区青贮玉米单位面积生物产量。叶绿素含量及荧光动力学参数可用于青贮玉米的耐旱性筛选。
Chlorophyll content and fluorescence kinetic parameters of 26 silage maize inbred lines and 105 combinations were determined by chlorophyll fluorescence instrument. Principal components and correlation analysis of key drought tolerance indexes of physiological traits were carried out. And the combining ability and genetic parameters were analyzed. The influencing factors of Fv / Fm in silage maize were as follows: leaf Fv> leaf Fm> leaf Fo> leaf area> leaf SPAD> husk leaf Fv / Fm> husk leaf SPAD. Nine inbred lines and SCA with high key indicators (Fm, Fv, Area Fv / Fm, leaf SPAD) and GCA (high combining ability) 19 combinations. At the stage of F1 silking, Leaf Fo and Leaf Area were dominated by gene additive effect. Fm and Fv were additive and non-additive, but Fv / Fm and SPAD were dominated by gene non-additive effect. The narrow sense heritability (h2N) size was as follows: leaf SPAD> leaf area> leaf Fo> leaf Fv> leaf Fm> leaf Fv / Fm. Through the direct and early direct selection of leaf Fv, the early direct negative selection of leaf Fo and the heterosis utilization of leaf Fv / Fm, the yield per unit area of silage corn can be increased. Chlorophyll content and fluorescence kinetic parameters can be used to screen drought-tolerant silage maize.