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银杏叶产量性状相关分析及多性状选择

CORRELATION ANALYSIS AND MULTIPLE TRAIT SELECTION ON YIELD CHARACTERS OF GINKGO LEAVES

  • 摘要: 采用全国86个银杏叶单株无性系、随机区组设计(RBE)对7个数量性状的直接、间接和多性状选择进行了研究。方差分析表明, 叶面积系数(Lai)和小区叶产量(Y)的遗传力(h2)较高, 直接选择Lai、NL(叶数/株)和Y的ΔG′(相对遗传增益)分别为81.94%、29.60%和26.17%。关系分析表明, 长枝上的叶宽(Lw)-叶干重(Ld)、短枝上叶宽(Sw)-叶干重(Sd)、叶数/株(NL)-小区产量(Y)及Sw-Lw之间的遗传相关系数(rg)为0.5437~0.8306。Lw-Ld、Lw-Y、Lai-Y、NL-Y的h(x, y)为0.2506~0.3669。NL和Sd→Y的直接遗传通径系数(PY·i)高达0.6890和0.2956, 但Lai→Y的直接遗传PY·irg为-0.1510和0.4199**。产量指标的间接选择响应(IR)低于直接选择(GS), 但Lai采用直接和间接选择效果更好。综合选择指数(Ii)筛选发现, 若含有产量本身的多性状选择, 其riY(指数与生长基因型值的相关)、E(I)(选择指数的效率)及CGS′(I)(应用选择指数时, 生长的相关遗传进度的比较效率)均大于单性状和不含Y的多性状选择。运用选择指数从86个无性系中初选出21个大叶高产无性系, 其选择效果优于直接和间接选择。

     

    Abstract: The direct, indirect and multiple trait selection on seven quantitative characters of Ginkgo leaves from all over the country, and 86 single tree clones through randomized block experiment (RBE) are studied in this paper.The results of variance analysis show that the heritabilities (h2) of leaf area index(Lai) and yield(Y) are 0.7345 and 0.4774, respectively. ΔG′(%) of direct selection ( K =2.06) on Lai, No.leaves/tree(NL) and Yare 81.94%, 29.60% and 26.17%.The results of correlation analysis show that coefficients of genetic correlation ( rg ) of leaf width leaf dry wt.on long shoot (Lw-Ld), leaf width leaf dry wt.on short shoot (Sw-Sd), NL-Y, and Sw Lw are between 0.5437~0.8306.The correlation heritabilities 〔h(x, y)〕 of Lw-Ld, Lw-Y, Lai-Y, and NL Yare between 0.2506~03669.The direct genetic path coefficients (PY·i) of NLand Sd→ Yare 0.6890 and 0.2956, respectively, butPY·iand rg to Lai→ Yare -0.1510 and 0.4199, respectively.Response to indirect selection (IR) is less than response to direct selection (GS) on ginkgo leaves characters, but direct and indirect selection are best to Lai.The results of index selection show that riY, E (I) and CGS′ to multiple trait selection including Yare more than single trait and multiple trait selection nonincluding-Y.Twenty one Large leaf, high yield clones are selected from all over the country 86 clones through index selection, and hereditary gain is more than direct and indirect selection.

     

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