共查询到17条相似文献,搜索用时 218 毫秒
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吉eA是赣州市农业科学研究所利用该所(K17B/丰B)F3代保持系的优良株系,通过60Coγ辐射诱变获得eui突变体,与K17A/(K17B/丰B)A的回交(B3F1)3代的不育株连续回交转育成的长穗颈不育系。吉eA农艺性状稳定、株叶形态好,播始历期70 d,比K17eA长7~8 d,不育株率100%,不育度100%,花粉败育率99.99%,开花习性较好,午前花比例高,柱头外露率高,柱头活力强,该不育系有轻度包颈,对"920"敏感,稻米品质优,抗性较强,千粒重较小。 相似文献
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杂交水稻新组合K优40的选育及栽培技术 总被引:5,自引:0,他引:5
[目的]推广杂交水稻新组合K优40。[方法]对K优40的选育过程、产量表现、特征特性及栽培技术要点进行阐述。[结果]K优40是不育系K17A和恢复系R40配组育成的三系中籼杂交稻新组合。该组合具有株型适宜、分蘖力强、耐肥抗倒、长势旺盛、抽穗整齐、熟相好等特性,已于2000年通过四川省农作物品种审定委员会审定,2007年通过重庆市农作物品种审定委员会认定。[结论]该组合适宜重庆市和四川省海拔800 m以下稻瘟病非常发区作中稻种植。 相似文献
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籼型长穗颈不育系K17eA选育 总被引:17,自引:1,他引:16
1999年 10月从福建农业大学引进“水稻雄性不育系的选育方法”。用60 C0 γ射线直接照射籼型杂交稻亲本K17B等一批杨仁崔未处理过的保持系 ,M2 群体中获得长穗颈eui隐性基因突变体。用K17eB突变体与相应的不育系K17A杂交、回交 ,育成长穗颈不育系K17eA。 2 0 0 1年 7月 30通过江西省科技厅组织省内外有关专家的现场验收评议 相似文献
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长穗颈不育系协青早eA(1)的选育 总被引:3,自引:0,他引:3
目前推广的籼型不育系存在着较严重的包颈现象 ,限制了繁种和制种产量的提高 .通过直接辐射诱变保持系协青早 B,获得其高秆隐性突变体协青早 e B( 1) ,再转育成不包颈不育系协青早 e A( 1) ,使不育系不仅解除包颈现象 ,且能保持原不育系的优良农艺性状和产量性状 .用协青早 e A( 1)组配的杂种 F1代与不含 eui基因的协青早 A的杂种 F1代无显著差异 ,并具一定增产潜力 .该不育系已于 1999年 9月通过了福建省教委组织的技术鉴定 相似文献
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调查了564份水稻材料的柱头外露率,测量了其中部分材料的外露柱头长度和宽度。19份野生稻柱头都外露,其中17份外露率高,最高为100%,外露柱头长,最长达2.6mm,表明柱头外露是稻属的一种原始性状。中、高纬地区的粳稻育成品种中,柱头全不外露的较多,有些柱头虽外露,但外露率低,外露的柱头短。我国中、低纬地区的早籼也是这样。云南的地方品种中柱头外露的多,而且外露率高、外露柱头长。云南地方品种的这种原始性状,看来也可作为云南是稻种起源中心之一的旁证。 相似文献
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杂交稻新组合eⅡ优315的特征特性及其高产栽培技术 总被引:1,自引:0,他引:1
eⅡ优315系福建农林大学作物遗传育种研究所采用长穗颈不育系Ⅱ-32 eA与FR315组配而成的高产优质e-杂交稻组合。本文研究了eⅡ优315的分蘖动态、农艺性状及产量构成等生物学特性,结果表明,eⅡ优315株高133.5 cm,全生育期为145 d;实割产量8350.5 kg.hm-2,比对照品种汕优63增产10.1%,达显著水平。本文还对eⅡ优315的高产栽培技术进行了总结。 相似文献
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DNA sequences of fatty acid elongase 1 genes FAE1.1(EA) and FAE1.2(EC) were isolated and characterized for 30 commercialized low erucic acid rapeseed(LEAR) cultivars in China. Four types of independent mutation leading to low erucic acid trait were found, i.e., a single-base transition(eA1), a two-base deletion(eC2) and four-base deletion(eC4) as well as single-base transition with a four-base deletion(eA*). Three genotypes, i.e., eA1eA1eC2eC2, eA1eA1eC4eC4 and eA*eA*eC4eC4 were responsible for LEA content in storage lipids of different rapeseed cultivars. Most of the LEAR cultivars had a genotype of eA1eA1eC2eC2, which were descended from the first LEAR cultivar, Oro. Yeast expression analysis revealed that two-base-pair(AA) deletion(eC2) at the base sites of 1 422–1 423 in the C genome FAE1 gene resulted in the absence of the condensing enzyme and led to the failure to produce erucic acid. Coexpression of FAE1 and ketoacyl-CoA reductase(KCR) or enoyl-CoA reductase(ECR) was found in high erucic acid rapeseed(HEAR) but not in LEAR(eA1eA1eC2eC2 or eA1eA1eC4eC4). Moreover, KCR and ECR were still coordinately regulated in eA1eA1eC2eC2 or eA1eA1eC4eC4 genotypes, suggesting that the expression of two genes was tightly linked. In addition, specific detection methods were developed by high-resolution melting curve analysis in order to detect eA1 and eC4. 相似文献
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Breeding Technology of eui-hybrids of Rice 总被引:1,自引:0,他引:1
YANG Ren-cui ZHANG Shu-biao HUANG Rong-hua YANG Shu-lan ZHANG Qing-qi 《中国农业科学(英文版)》2002,1(4):359-363
Induced mutants of elongated uppermost internode (eui) were directly obtained after irradiation on maintainer (B) and restorer (R) lines of hybrid rice. CMS lines(A) with eui (referred to as eA), restorer lines with eui (referred to as eR) as well as hybrid rice with eui gene (referred to as e-hybrids)were developed. The results showed that the eui mutation frequency averaged 0.10‰ at a range of 0.02‰ - 0.47‰,varying with applied dosage and mutated materials. Genetic diversities of eui stock, and a new eui gene, temporarily designated as eui2(t), was identified. eA lines have a significantly elongated uppermost internode causing better panicle exsertion and possessing higher outcrossing potential. e-hybrids increased plant height by 3 - 10 cm and headed 2 - 3 days earlier, as well as showed greater grain weight resulting in higher yield potential than that of corresponding original hybrids. The technology systems without GA3, a few of using GA3 in hybrid rice seed production, and the establishment of e-hybrid rice breeding system were also discussed in this paper. 相似文献
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对生产上广泛应用的24份水稻细胞质雄性不育系的异交性能的分析表明:在7个开花性状中,只有开花历时和开花时间与异交结实率呈负相关,而柱头双边外露率、包颈粒率、柱头单边外露率、张颖角度、开花历期都与异交结实率呈正相关。通径分析显示,各个开花性状与异交结实率的直接通径系数由大到小依次为包颈粒率、柱头单边外露率、张颖角度、柱头双边外露率、开花历期、开花时间、开花历时;其中包颈粒率、柱头单边外露率、张颖角度、柱头双边外露率对异交结实率的直接作用都远大于间接作用,这表明这几个性状与异交结实率有很大的相关性;而开花历时的直接通径系数为负值。 相似文献
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对13个籼型杂交稻不育系及其保持系的异交、花器、农艺和米质等24个性状较系统地进行比较分析.结果表明,新近选育的籼型不育系趋于长颖花、长柱头、长花柱、较高的柱头外露率和天然异交率;较长、窄的剑叶和倒二叶,穗也较长;稻米的外观品质也相对较优.本文还对柱头外露率和米质性状的选育途径进行了讨论. 相似文献