共查询到18条相似文献，搜索用时 390 毫秒
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细胞质雄性不育海岛棉与陆地棉三交种的杂种优势表现 总被引：2，自引：0，他引：2
以海岛棉和陆地棉不育系及其恢复系为杂交亲本,配制了10个海岛棉与陆地棉种间三交种（简称海陆三交种）和4个单交种。经两年田间试验表明,海陆三交种相对于海海单交种产量极显著提高,与海陆单交种无显著差异,但比陆陆单交种显著减产;纤维品质接近于海陆单交种,显著高于陆陆单交种;制种产量虽然不及陆陆单交种,但比海海单交种显著增产。选育海陆三交种应注重选择早熟的海岛棉不育系,高衣分的陆地棉临时保持系,大铃的陆地棉恢复系,且叶型和株型相对一致的亲本配制组合。 相似文献
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玉米改良单交种选育方法的研究 总被引：17，自引：1，他引：17
用30个遗传差异不大的Mo17改良系作用与Mo17组成姊妹种（A1×A2），再以30个姊妹种以及30个Mo17改良系作母本，与父本自交系E28，5003配成改良单交种和普通单交种，试验表明：改良单交种的产量、农艺性状和整齐度与相应的普通单交种基本一致，而姊妹种的产量明显地高于任一亲本自交系，故改良单交种具有制种产量高的优点。姊 相似文献
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大白菜核不育纯合两型系及同源临保系的选育方法探讨 总被引：1，自引：0，他引：1
本文以含有显性不育基因的F1杂种为基础材料，按核不育三系配套制种模式理论和显性上位遗传假说表达．讨论了大白菜核不育纯合两型系及同源临保系的选育方法。 相似文献
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利用姊妹种改进玉米种子生产技术的初步研究 总被引：4，自引：0，他引：4
１９８７－１９８９年对以姊妹种代替姊录系改进玉米种子生产技术所涉及的几个关键问题进行了研究。结果表明，姊妹的产量，农艺性状、整齐度优于对应的姊妹第，用其制种可增产５０％以上，姊妹种的合配力水平与对应姊妹系相当且可稳定遗传；改良单交种的产量、农艺性状、整齐度类似相应单交种。 相似文献
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A comparison of cytoplasmic and chemically-induced male sterility systems for hybrid seed production in wheat (Triticum aestivum L.) 总被引：1，自引：0，他引：1
A comparison of two male sterility systems was carried out in wheat for hybrid seed production and hybrid performance. Seventeen
hybrid combinations based on Triticum timopheevi cytoplasm were compared with their genetically equivalent CHA-facilitated combinations. The same set of restorer lines was
used as parents in CMS- and CHA-based hybrids to maintain genetic equivalence. In the first experiment aimed at study of female
line behavior and crossed seed production, the CHA treated lines showed significantly shorter heights whereas CMS lines were
similar to the control. The two systems were equally effective in sterilizing rate. The outcrossing percentage of the CMS
lines was almost twice that of the CHA treated lines. Thousand-grain weight of the crossed seeds on CMS lines was greater
than on the CHA treated lines and control. On average, the germination percentage of seeds on CMS lines was double that of
the CHA treated lines and the percentage of effective outcrossed seeds in CMS lines was 3 times more than that from CHA treated
lines. The second experiment was conducted to examine the yield performance of the hybrids derived from the two systems of
male sterility. A total of 40 entries including 20 hybrids and 20 parents were evaluated in the experiment. The mean grain
yield of the CMS-based hybrids was greater than that of the CHA-based hybrids,the B and R lines. All the CMS-based hybrids
showed significantly higher grain yields than their better parents whereas all the CHA-based hybrids, except two,showed no
significant yield increases over their better parents. Possible reasons for differences in CMS- and CHA-based hybrid performance
are discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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H. M. G. van der Werf J. Hoek M. J. Soepboer 《Journal of Agronomy and Crop Science》1989,162(1):43-48
A proportion of the maize seed sold in the Netherlands is genetically impure. The most common form of genetic impurity in hybrid seed production is the accidental self-pollination of the female parent. Varying quantities of selfed seeds were added to certified seedlots of three-way cross hybrids. These mixtures were tested in nine field experiments, in 1985 and 1986.
Whole plant dry matter yield decreased by 40 to 45 kg/ha per percent of selfed seed added. The effect of selfed seed on dry matter yield did not differ significantly in the hybrids studied. 相似文献
Whole plant dry matter yield decreased by 40 to 45 kg/ha per percent of selfed seed added. The effect of selfed seed on dry matter yield did not differ significantly in the hybrids studied. 相似文献
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本研究对（亚洲棉Ｘ比克氏棉）Ｘ陆地棉种间三元杂种植株和花器形态特性、腺体表现和棉酚含量进行了比较和研究。结果表明，用有酚棉和低酚棉作陆地棉亲本配制的不同类型的种间三元杂种在植株和花器形态性状上无显著差异；但在各器官和组织上的腺体表现和棉酚含量有明显的差异。用低酚棉配制的三元杂种完全表现有比克氏棉子叶腺体延缓发生性状；而用有酚棉配制的三元杂种在种子上尚有少量腺体，但包括花器在内的其它器官和组织均为有腺体类型，腺体密度和大小与一般有酚棉相同。此外，本文对比克氏棉子叶腺体延缓发生性状的遗传和腺体与棉酚含量的关系等问题进行了讨论。 相似文献
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棉花杂种优势与几种生理生化指标的相关性 总被引：12，自引：0，他引：12
对８个陆地棉杂种及其亲本的四种生理生化指标进行了测定，并研究了这些指标与杂种产量优势的相关性，结果表明：幼芽匀浆互补法对Ｆ１皮棉超亲优势、中亲优势的预测相符率分别为８７．５％和７５．０％；杂种萌动种子ＡＴＰ含量普遍高于双亲平均值。超亲优势、中亲优势与杂种ＡＴＰ含量及双亲ＡＴＰ含量的平均值均呈正相关，且中亲优势与杂种ＡＴＰ含量相关显著（ｒ＝０．７１８８，Ｐ〈０．０５）；杂种产量优势与盛蕾期、盛花期的 相似文献
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Summary F5 seeds from six highly heterotic F1 hybrids were produced to determine whether the superior performance of F1 hyrids could be fixed in pure-line derivatives of pea (Pisum sativum L.). For each cross, 24–31 F5 lines derived from single seed descent were compared with F1 hybrids and their parents in two environments. The F1 hybrids out-yielded the best parent by up to 11%. All crosses produced F5 lines which were as high in yield as the F1 hybrids indicating that pure-line derivatives equivalent in yield to the heterotic F1 hybrid could be developed by conventional breeding. Heterosis of the F1 hybrids over the best commercial cultivar was thus a useful indicator of the future performance of the pure-line derivatives. These results indicate that overdominance was not an important component of heterosis in peas. 相似文献