共查询到18条相似文献，搜索用时 125 毫秒
1.
为揭示总不育小穗数、基部和顶部不育小穗数的遗传特点,利用2个相关重组自交系群体,结合4个环境的表型数据和QTL检测结果,对其进行了分析。2个群体表型数据相关性分析和通径分析结果一致表明,顶部不育小穗是引起总不育小穗数的主要因素,这一结果与前人研究结果相反。环境间表型数据相关性分析结果表明,3个性状受环境影响均较大,其中复合性状总不育小穗数由于受其构成因素基部和顶部不育小穗数的双重影响而表现受环境影响最大,顶部不育小穗数次之。QTL检测结果表明:影响总不育小穗数的遗传因素并非是其构成因素遗传因子的简单累加,总不育小穗数、基部和顶部不育小穗数3个性状在QTL水平关系复杂,既在3个性状间或两两性状间检测到共同QTL,也分别检测到单一性状的特异QTL。顶部不育小穗数与总不育小穗数之间存在显著遗传相关性和较多的共同QTL。为小麦不育小穗性状的遗传改良和小麦生产中栽培措施的合理运用提供了参考依据。 相似文献
2.
以IR36（indica）和热研2号（japonica，广亲和品种）为亲本，构建了包含180个单株的F2群体及包括110个标记的分子连锁图谱。利用该F2群体，进行了水稻花粉不育数量性状基因座(quantitative trait locus, QTL)的检测和遗传效应分析，共检测到3个花粉不育QTL，分别位于第3、5、7染色体上，此外，共检测到9个由雄配子引起的偏分离QTL，其中7个与ga-14和ga-11位点的配子败育类型相同。与花粉形态鉴定相比，偏分离的数据对检测F1杂种花粉败育基因更为敏感。在第5、6染色体上控制偏分离的2个QTL位点，其杂合基因型出现的频率偏高。在qHPS-5位点，粳型纯合子表现出比杂合子和籼型纯合子更低的育性水平。本研究获得的分子标记将有助于聚合尽可能多的中性亲和基因以解决亚种间F1杂种的花粉不育性问题。 相似文献
3.
一个新的水稻花粉半不育性位点的定位分析 总被引：1，自引：0，他引：1
利用一套以籼稻珍汕97B为背景的粳稻日本晴染色体片段代换系,鉴定发现1个半不育的代换系。全基因组基因型分析表明,该代换系仅含3个粳稻导入片段,而其他遗传背景与珍汕97B相同。在湖北武汉和海南分别种植其衍生的F2和F3分离群体,采用单标记分析和区间作图法分析花粉育性和小穗育性的数量性状位点(QTL),结果表明,该代换系的半不育性是第2染色体上的粳稻导入片段引起的,该片段RM262~RM475区间存在1个新的影响花粉育性的QTL,其贡献率为13.9%。研究结果将为进一步精细定位水稻育性QTL以及鉴定相关功能基因提供重要的试验基础。 相似文献
4.
水稻籼粳亚种间存在着强大的杂种优势,但杂种育性普遍偏低成为这一杂种优势利用的主要障碍.研究证明,花粉不育是导致杂种不育的主要原因之一.张桂权和卢永根等(1987-1994)鉴定了6个花粉不育基因座位(S-a,S-b,S-c,S-d,S-e和S-f).其中S-a基因座位已被庄楚雄等(1996)初步定位在水稻第一染色体着丝粒附近.本论文是在此基础上,利用美国Cornell大学、日本RGP构建的水稻高密度遗传图和日本构建的BAC/PAC物理图及其基因组测序资料,对S-a作进一步的精细定位,建立了包含该基因的TAC重叠群,并通过序列分析发现S-a候选基因,为分离鉴定S-a基因及研究该基因在水稻杂种不育中的分子作用机理打下了基础.本研究主要结果如下1. 构建了台中65(含S-aj) 及其近等基因系TILS4(E4,含S-ai )杂交的F2群体,观察了706株F2个体的花粉育性分离状况.其中可育株367株,半不育株339株,分离比为1∶1.2. 利用前人筛选的多态性标记R2159、R1928和本研究新获得的多态性标记GR2、GR1、AR1、D2.3M、D1.5S、F12M1,用706株F2群体对S-a进行了的精细定位.结果表明S-a与分子标记R2159、GR2、GR1、AR1、R1928、F12M1、D1.5S和D2.3M之间的遗传距离分别为2.07cM,1.21cM,0.65cM,0.42cM,0.42cM,0.45cM,0.14cM和0cM.与S-a紧密连锁的5个分子标记(<0.5cM)分布在S-a两侧,其中D2.3M为S-a的0cM标记.依据该区域物理距离对遗传距离的平均换算值200kb/cM,将基因定位在约30kb范围内.3. 构建了籼稻广陆矮4(含S-aj)、粳稻台中65(含S-aj)和S-ai近等基因系(E4)的基因组TAC文库,各文库分别包含12万、10万和11万平均大小为43kb的克隆,各文库覆盖率平均约达10倍水稻基因组大小.依据定位结果,用覆盖S-a的100kb范围内所设计的单/低拷贝片段为探针,筛选粳稻台中65、籼稻广陆矮4和不育近等基因系E4的TAC基因组文库,构建了基于TAC克隆的S-a座位的物理图.4. 根据基因序列分析,在与S-a座位完全连锁的标记D2.3M两旁30kb范围内发现了3个开放读码框,其中一个是具有bHLH结构域的转录因子,一个是N端有DENN结构C端有8WD40重复的转录因子,另一个是丝氨酸/苏氨酸型的蛋白激酶.本研究将其定为S-a的候选基因,分别进行基因序列及其表达的分析.5. 用特异引物进行RT-PCR,从台中65和E4小穗RNA中扩增出HLH转录因子的cDNA片段.测序分析表明该片段与预测的外显子结构一致.利用RT-PCR和Southern杂交证明该bHLH在E4和T65的幼穗部表达,但表达量很低.同时进行的RT-PCR也证明WD40重复的转录因子在E4的幼穗中表达.8WD40重复的转录因子和蛋白激酶基因的进一步测序和基因表达分析工作正在进行中. 相似文献
5.
水稻S-c座位的PCR标记精细定位及分子标记辅助选择 总被引：21，自引：1，他引：21
以粳型品种台中65及其近等基因F1不育系TISL5为材料,利用STS和SSLP标记对水稻F1花粉不育基因座位S-c进行了精细定位,RG227STS和RM218分别位于S-c的两侧,与S-c的距离分别为0.3cM和4.3cM.通过对40个籼、粳和中间型品系标记基因型的鉴定,分析了分子标记基因型与S-c基因型之间的关系,建立了以PCR为基础的分子标记辅助选择体系.利 相似文献
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7.
光温敏核不育水稻的育性光温敏感度对两系杂交水稻的繁殖与制种有重要影响。为了定位影响温敏核不育水稻育性转换的低温敏感度QTL,以冷繁结实率存在明显差异的2个温敏核不育水稻N38S和N727S为亲本构建的F_2群体为作图群体,利用人工气候箱的低温处理和SSR标记技术,结合Mapmaker 3.0及WinQTLCart 2.5软件分析,检测低温敏感度QTL位点。结果显示,共检测到3个低温敏感度QTL,其中QTL1位于水稻第1染色体的PSM12与RM583之间,QTL2和QTL3分别位于第4染色体的PSM194与RM273之间和RM273与PSM103之间,它们加性效应均为负值,对育性转换的贡献率分别为7%,16%,3%。基于分子标记的位置信息可知,3个QTL位点与已定位的光温敏核不育水稻育性相关基因不等位。综上,QTL1、QTL2和QTL3可能是新基因位点,N727S携带的等位基因起到提高繁种产量的作用,在利用分子标记辅助选择时,应选择N727S的标记类型。这3个低温敏感度QTLs的定位可能对于温敏核不育水稻进行易于转育繁种的分子标记辅助选择具有重要意义。 相似文献
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9.
小麦穗部性状与产量密切相关,挖掘穗部性状基因及其关联分子标记具有重要意义。本研究以周8425B?小偃81衍生的RIL群体(F8)为材料,利用90k芯片标记构建的高密度遗传图谱对3个环境下的穗长、小穗数、不育小穗数、穗粒数、千粒重进行QTL定位。共检测到19条染色体上的71个QTL,变异解释率(PVE)范围为2.10%~45.25%,其中37个位点为主效QTL(PVE10%)。QSl.nafu-6A.2(穗长)、QSl.nafu-7A(穗长)、QSsn.nafu-2A.1(不育小穗数)、QSsn.nafu-2D(不育小穗数)和QGns.nafu-2B(穗粒数)在多个环境中被检测到,且LOD10,PVE20%。位于同一个基因簇中的QSl.nafu-6A.2(穗长)、QGns.nafu-6A(穗粒数)和QTgw.nafu-6A(千粒重)在多个环境中被检测到,且与已报道的相关位点位置相同或相近,在分子标记辅助育种中具有较大参考价值。 相似文献
10.
阐明BT型杂交粳稻组合间育性差异的遗传基础有助于三系法杂交粳稻组合的选育。根据TR2604与豫粳6号A(B)、9201A(B)后代的花粉育性及小穗育性,明确了豫粳6号A(B)/TR2604 F1不育由双亲间特异性不亲和造成。遗传分析表明豫粳6号A(B)与TR2604 F1花粉不育受单基因S38(t)控制。以352株豫粳6号A/TR2604//TR2604、豫粳6号B/TR2604//豫粳6号B等群体中单株为定位群体,将S38(t)定位于第7染色体上标记RM18和RM234之间,与两标记遗传距离分别为0.43 cM和0.14 cM,两标记间物理距离为180 kb,相关结果为S38(t)图位克隆工作奠定了基础。 相似文献
11.
稻米直链淀粉含量基因座位的分子标记定位 总被引：29，自引：0，他引：29
以直链淀粉含量(AC)中等的CT9993和泰国优质的香软米KDML105杂交产生的152个重组近交系 (RIL)为材料, 构建了含83个RFLP、 69个AFLP和15个微卫星(SSLP)标记的分子标记连锁图 , 标记间平均距离为12.98 cM。 应用该连锁图对控制稻米AC的基因座位(QTL)进行了分析 。 结果表明： 稻米AC主要受两个主效QTL和5个微效QTL的共同控制 相似文献
12.
Jing Li Peng Xu Xianneng Deng Jiawu Zhou Fengyi Hu Jianmin Wan Dayun Tao 《Euphytica》2008,164(3):699-708
To further understand the nature of hybrid sterility between Oryza sativa and Oryza glaberrima, quantitative trait loci (QTL) controlling hybrid sterility between the two cultivated rice species were detected in BC1F1 and advanced backcross populations. A genetic map was constructed using the BC1F1 population derived from a cross between WAB450-16, an O. sativa cultivar, and CG14, an O. glaberrima cultivar. Seven main-effect QTLs for pollen and spikelet sterility were detected in the BC1F1. Forty-four sterility NILs (BC6F1) were developed via successive backcrosses using pollen sterility plants as female and WAB450-16 as the recurrent parent.
Seven NILs, in which the target QTL regions were heterozygous while the other QTL regions as well as most of the reminder
of the genome were homozygous for the WAB450-16 allele, were selected as the QTL identification materials. BC7F1 for the seven NILs showed a continuous variation in pollen and spikelet fertility. The four identified pollen sterility QTLs
were located one each on chromosomes 1, 3, 7 and 7. Pollen sterility loci qSS-3 and qSS-7a were on chromosomes 3 and 7, respectively, which coincides with the previously identified S19, and S20, while loci qSS-1 and qSS-7b on chromosomes 1 and 7L appear distinct from all previously reported loci. An epistatic interaction controlling the hybrid
sterility was detected between qSS-1 and qSS-7a. 相似文献
13.
用(培矮64s/Nipponbare)F2群体对水稻产量构成性状的QTL定位分析 总被引：8，自引：0，他引：8
用水稻测序品种培矮64s和Nipponbare为亲本构建的含137个SSRs标记的连锁遗传图谱和(培矮64s/Nipponbare)F2群体的180个单株,对水稻的单株有效穗数、穗粒数、穗实粒数、结实率、穗着粒密度、千粒重等6个产量构成性状进行了QTL定位分析.共检测到6个性状的22个QTLs,分布在第1、2、4、5、6、9、10、11、12等9条染色体的14个区域,表型贡献率5.0%～19.3%;相关性较强的性状之间具有较多共同或紧密连锁的QTLs;集中分布的QTLs之间既有同向连锁,也有反向连锁.对不同水稻群体定位的同源QTL进行了比较,对QTL在染色体上的集中分布,以及用QTL定位结果和生物信息学方法相结合预测基因的功能等进行了探讨. 相似文献
14.
Genetic maps are useful for analysis of quantitative trait loci (QTLs) and for marker-assisted selection (MAS) in breeding.
A simple sequence repeat (SSR) marker linkage map of common wheat was constructed based on recombination inbred lines (RILs)
derived from a cross between Chinese Spring and spelt wheat. The map included 264 loci on all wheat chromosomes covering 2,345.2 cM
with 962, 794.6, and 588.6 cM for the A, B, and D genomes, respectively. Using the RILs and the map, we detected 42 putative
QTLs on 15 chromosomes for ear length, spikelet number, spike compactness, kernel length, kernel width, kernel height and
β-glucan content. Each QTL explained 4–45% of the phenotypic variation. Five QTL cluster regions were detected on chromosomes
1A, 5AL, 2B, 2D, and 4D. The first QTLs for β-glucan content in wheat were identified on chromosomes 3A, 1B, 5B, and 6D. 相似文献
15.
Hybrids between indica and japonica rice varieties usually show partial sterility, and are a major limiting factor in the
utilization of heterosis at subspecific level. When studying male-gamete (pollen) abortion, a possibly important cause for
sterility, six loci (S-a, S-b, S-c, S-d, S-e and S-f) for F1 pollen sterility were identified. Here we report genetic and linkage analysis of S-c locus using molecular markers in a cross between Taichung 65, a japonica variety carrying allele S-c
j, and its isogenic line TISL5, carrying alleleS-c
j. Our results show that pollen sterility occurring in the hybrids is controlled by one locus. We used 208 RFLP markers, as
well as 500 RAPD primers, to survey the polymorphism between Taichung 65 and TISL5. Six RFLP markers located on a small region
of chromosome 3, detected different RFLP patterns. Co-segregation analysis of fertility and RFLP patterns with 123 F2 plants confirmed that the markers RG227, RG391, R1420 were completely linked with the S-c locus. The genetic distances between the markers C730, RG166 and RG369 and the S-c locus were 0.5 cM, 3.4 cM, and 3.4 cM respectively. Distorted F2 ratios were also observed for these 4 RFLP markers in the cross. This result suggests that the `one locus sporo-gametophytic'
model could explain F1 hybrid pollen sterility in cultivated rice. RG227, the completely linked marker, has been converted to STS marker for marker-assisted
selection.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
16.
用闭合三角形杂交群体检测QTL等位位点差异 总被引：1，自引：0，他引：1
本文简述QTL定位和数量性状分子标记辅助选择的基本原理、基本方法,以及在实际应用中存在的一些问题。将12个不同作图群体构建的刚UP或SSR分子标记连锁图,根据其大多数分子标记所在的染色体节,再按每条染色体在各自连锁图中的相对长度整合在一起,然后将所定位的玉米株高QTL转换成整合图上的相对位置。结果发现,12个作图群体定位的75个玉米株高QTL位点遍布整个染色体组,QTL定位的重演性不高。分析认为,这是数量性状受众多微效多基因控制的必然现象。最后,提出用闭合三角形杂交群体进行QTL定位,检测QTL等位点的多重差异,并设想用这种方法验证或提高不同作图群体定位同一数量性状QTL的重演性。 相似文献
17.
Peng Xu Jiawu Zhou Jing Li Fengyi Hu Xianneng Deng Sufeng Feng Guangyun Ren Zhi Zhang Wei Deng Dayun Tao 《Breeding Science》2014,63(5):476-482
Hybrid sterility hinders the transfer of useful traits between Oryza sativa and O. glaberrima. In order to further understand the nature of interspecific hybrid sterility between these two species, a strategy of multi-donors was used to elucidate the range of interspecific hybrid sterility in this study. Fifty-nine accessions of O. glaberrima were used as female parents for hybridization with japonica cultivar Dianjingyou 1, after several backcrossings using Dianjingyou 1 as the recurrent parent and 135 BC6F1 sterile plants were selected for genotyping and deducing hybrid sterility QTLs. BC6F1 plants containing heterozygous target markers were selected and used to raise BC7F1 mapping populations for QTL confirmation and as a result, one locus for gamete elimination on chromosome 1 and two loci for pollen sterility on chromosome 4 and 12, which were distinguished from previous reports, were confirmed and designated as S37(t), S38(t) and S39(t), respectively. These results will be valuable for understanding the range of interspecific hybrid sterility, cloning these genes and improving rice breeding through gene introgression. 相似文献
18.
P. Balaji Suresh B. Srikanth V. Hemanth Kishore I. Subhakara Rao L. R. Vemireddy N. Dharika R. M. Sundaram M. S. Ramesha K. R. S. Sambasiva Rao B. C. Viraktamath C. N. Neeraja 《Euphytica》2012,187(3):421-435
The Wild Abortive (WA) system is the major cytoplasmic male sterility (CMS) source for hybrid rice production in indica rice and its fertility restoration is reported to be controlled by two major loci viz. Rf3 on chromosome 1 and Rf4 on chromosome 10. With the availability of the rice genome sequence, an attempt was made to fine map, develop candidate gene based markers for Rf3 and Rf4 and validate the developed marker system in a set of known restorer lines. Using polymorphic markers developed from microsatellite markers and candidate gene based markers from Rf3 and Rf4 loci, local linkage maps were constructed in two mapping populations of ~1,500 F2 progeny from KRH2 (IR58025A/KMR3R) and DRRH2 (IR68897A/DR714-1-2R) hybrids. QTLs and their interactions for fertility restoration in Rf3 and Rf4 loci were identified. The identified QTL in both mapping populations together explained 66–72 % of the phenotypic variance of the trait suggesting their utility in developing a marker system for identification of fertility restorers for WA-CMS. Sequence comparison of the two candidate genes from the Rf3 and Rf4 regions in male sterile (A) and restorer (R) lines showed 2–3 bp indels and a few substitutions in the Rf3 region and indels of 327 and 106 bp in the Rf4 region respectively. The marker system identified in the present study was validated in 212 restorers and 34 maintainers along with earlier reported markers for fertility restoration of WA-CMS. Together DRCG-RF4-14 and DRCG-RF4-8 for the Rf4 locus and DRRM-RF3-5/DRRM-RF3-10 for the Rf3 locus showed a maximum efficiency of 92 % for identification of restorers. 相似文献