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hereditary   parameter
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     遗传性脑白质病
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This paper deals with three varieties of ‘Qiang Li Mi Show’,‘DwarfYellow’and‘Ohio MR-9’which contain TMV-rasistant genes of T_(m-1),T_(m-2)and T_(m-2)~a respectively.These three varieties were used as female parents forhybridization.The virus-resistance of the first generation was identified and thecombining ability of eight principal characters was analyzed.Thus the practialvalue of the three antigen plants was defined.The results indicated that the antigen plants and the hybrids of first genera-tion all manifested...

This paper deals with three varieties of ‘Qiang Li Mi Show’,‘DwarfYellow’and‘Ohio MR-9’which contain TMV-rasistant genes of T_(m-1),T_(m-2)and T_(m-2)~a respectively.These three varieties were used as female parents forhybridization.The virus-resistance of the first generation was identified and thecombining ability of eight principal characters was analyzed.Thus the practialvalue of the three antigen plants was defined.The results indicated that the antigen plants and the hybrids of first genera-tion all manifested virus-resistance at a definite level,especially the parent andthe F_1 hybrids which contained T_(m-2)~(nv) or T_(m-2)~a gene.Meanwhile,these three an-tigen plants possessed higher combining ability,a clear superiority of competitionboth in early and in total yields was exprassed in most hybrid combinations.Especially‘Dwarf Yellow’possessed very high combining ability in the eightcharacters except average weight per fruit.Hence‘Dwarf Yellow’is a betterparent for hybridization.In addition,hereditary parameters of the eight characters of the threeantigen plants were estimated,and a fine hybrid combination virus-resistanceand early high yield combining was selected.

本文对分别含有 Tm-1、Tm-2~(nv)、Tm-2~α的三个抗 TMV 病毒基因的品种强力米寿、矮黄、Ohio MR-9和以这三个抗原为亲本配制的 F_1代进行了抗病性鉴定,并对其八个主要性状配合力进行了分析,从而确定了三个抗原的实用价值。结果表明,三个抗原材料和 F_1代对 TMV 病毒都表现出一定的抗性,尤其是含有 Tm-2~(nv)和 Tm-2~α基因的 F_1代及亲本有高度抗性。同时,三个抗原材料配合力均高,在绝大多数组合中前期产量和总产量皆有明显的竞争优势。特别矮黄在八个性状中除单重外,一般配合力效应值都很高,可能与 nv 基因的多效作用有关。所以,矮黄是一个比较优良的杂交亲本。另外,本文对三个抗原八个性状的遗传参数也进行了估算,并选出了抗 TMV 病毒早熟丰产组合:矮黄×汉因兹、矮黄×加八号等。

It is the principal hope that wild Saccharum is further employed for sugarcane breeding.However,they manifeste low sucrose content and high fiber % in progenies.Therefore,it is the principal aim to obtain through breeding both high yield and high sucrose varieties in accord with the demands. Seven crosses were employed in this study,including four BC_1,one BC_2 of S spntaneum hybrids,and both positive as well as negative by S robustum F_1 & S spontaneum F_1 This study showed that both characteristics of yield...

It is the principal hope that wild Saccharum is further employed for sugarcane breeding.However,they manifeste low sucrose content and high fiber % in progenies.Therefore,it is the principal aim to obtain through breeding both high yield and high sucrose varieties in accord with the demands. Seven crosses were employed in this study,including four BC_1,one BC_2 of S spntaneum hybrids,and both positive as well as negative by S robustum F_1 & S spontaneum F_1 This study showed that both characteristics of yield and quality are low in positive and negative by S robostum F_1 and S spontaneum F_1 Thus, the significance lies not in the selection for breeding sugar production or source of energy The result showed high yield plants appeared much more in BC_1,but none of them contained sucrose up to 10% Thus,BC_1 was not good for sugar production but the new generation was ideal for source of energy and excellent parent for further selection.As to BC_2,high yield plants were comparatively few but 18% of the population reached the required standard and aquarter of the population contained sucrose no less than 10-14% Plants with high quality were also more in numbers.Thus BC_2 may be considered as qualified breed for the selection of high sugar content.The crossing of S rob F_1 and S sp F_1 were poor in either yield or quality so they were not satifactory for energy source or breeding materials. The calculated hereditary parameters from the dam appeared that h~2%, GCV% and GS' were higher in number of cane/stool stalk diameter and stalk volume.So selection of better backcross parent plants one may expect to obtain excellent varieties from BC_2.

野生甘蔗的进一步利用,是当前把甘蔗育种工作推向新阶段的主要希望。但是,野生甘蔗杂种早代通常存在着高产量、低糖分、高纤维分的倾向。怎样恰到好处地利用野生甘蔗的种性,创造蔗糖分符合要求的高产品种,进一步提高育种效果,是本研究的主要目的。本研究采用7个杂交组合,包括 S.spontaneum 杂种的回交一代(BC_1)和回交二代(BC_2),以及 S.robustum F_1 同 S.spontaneum F_1 正反交(即二个野生种杂种后代早代正反交)。综合产量性状和质量性状的研究表明,BC_1虽具高产的植株多,但几乎没有含糖分达10%以上的植株,所以不是以制糖为目的的育种的选择世代,但它是理想的能源育种和创造新优良亲本的重要选择世代。BC_2虽包含高产的植株少,但尚有18%的较高生产水平的植株,而且有1/4的植株含糖分在10~14%,具其他优良质量性状的蔗株也较多,所以,是培育蔗糖分符合要求的高产品种的重要选择世代。S.rob F_1和 S.sp F_1正反交,其质量性状和产量性状都下降,所以,对以制糖或能源为目的的育种都没有意义。遗传参数的分析表明,茎数、茎径和茎生长量的广义遗传力强,遗传型变异系数较大,相对...

野生甘蔗的进一步利用,是当前把甘蔗育种工作推向新阶段的主要希望。但是,野生甘蔗杂种早代通常存在着高产量、低糖分、高纤维分的倾向。怎样恰到好处地利用野生甘蔗的种性,创造蔗糖分符合要求的高产品种,进一步提高育种效果,是本研究的主要目的。本研究采用7个杂交组合,包括 S.spontaneum 杂种的回交一代(BC_1)和回交二代(BC_2),以及 S.robustum F_1 同 S.spontaneum F_1 正反交(即二个野生种杂种后代早代正反交)。综合产量性状和质量性状的研究表明,BC_1虽具高产的植株多,但几乎没有含糖分达10%以上的植株,所以不是以制糖为目的的育种的选择世代,但它是理想的能源育种和创造新优良亲本的重要选择世代。BC_2虽包含高产的植株少,但尚有18%的较高生产水平的植株,而且有1/4的植株含糖分在10~14%,具其他优良质量性状的蔗株也较多,所以,是培育蔗糖分符合要求的高产品种的重要选择世代。S.rob F_1和 S.sp F_1正反交,其质量性状和产量性状都下降,所以,对以制糖或能源为目的的育种都没有意义。遗传参数的分析表明,茎数、茎径和茎生长量的广义遗传力强,遗传型变异系数较大,相对遗传进度高,所以,只要选择好回交亲本,可以指望在 BC_2获得优良品种。

The test on the 9 Progenes of half-sib of laequertrees has beenmade in Guizhott from 1985-1988.The fine family Preliminarily has been selected according to the average eff-ect and hereditary Parameter of different family has been estimated.

本文通过贵州9个漆树半同胞子代,1985~1988年多年多点测定,并根据其家系间的平均效应值及其遗传参数估算,对优良家系作出了初步评选。

 
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