共查询到18条相似文献,搜索用时 62 毫秒
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疣粒野生稻抗白叶枯病新基因的初步鉴定 总被引:1,自引:0,他引:1
以10个菲律宾白叶枯病菌小种和1个中国白叶枯病菌小种为供试菌系,以高感白叶枯病水稻品种IR24及携有不同抗白叶枯病基因的近等基因系IRBB1等16个材料作为参照,对粳稻品种8411/疣粒野生稻体细胞杂交获得的两个抗白叶枯病新种质SH5和SH76进行了白叶枯病抗谱鉴定。结果表明SH5和SH76在苗期的抗谱较广,并且与已知抗病基因的抗谱不同,但与IRBB5(xa5)和IRBB7(Xa7)相似。分别用xa5和Xa7的分子标记2F_1R和M5进行检测,确定SH5和SH76中不含有xa5和Xa7基因。初步推测SH5、SH76可能含有一个新的抗病基因或者一个连锁的基因簇群。 相似文献
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小麦种质资源BJ399抗条锈病基因的分子标记定位 总被引:1,自引:0,他引:1
条锈病是影响小麦产量和品质的一种世界性病害。种质资源BJ399对小麦条锈病具有良好的苗期和成株期抗性,为明确其条锈病抗性基因,利用BJ399和高感条锈病品种铭贤169杂交,获得BJ399/铭贤169的F_1、BC_1和F_2代分离群体,并利用我国当前流行的条锈菌生理小种条中34号(CYR34)进行温室苗期抗条锈性鉴定和遗传分析。结果表明,BJ399对CYR34的抗性由1对显性基因控制,暂命名为 YrBJ399。筛选到3个与目的基因连锁的SSR标记Xwmc296、Xgwm425和Xgwm558,且3个标记位于抗病基因的同一侧,距离目的基因最近的标记为Xwmc296,其遗传距离为9.5 cM,标记Xgwm425和Xgwm558与目的基因 YrBJ399的遗传距离分别为14.3 cM和18.0 cM,并初步将抗病基因定位于小麦染色体2AS上。根据抗病基因来源和染色体定位结果推测, YrBJ399可能是一个抗条锈病新基因。 相似文献
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大豆抗病基因定位的分子标记研究进展 总被引:5,自引:2,他引:3
综述现代分子标记技术在大豆疫霉根腐病、细菌性斑点病、花叶病毒病、灰斑病、孢囊线虫、瘁死综合症等病害抗病基因定位中的最新进展,并指出抗病基因的群聚分布现象。 相似文献
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野生稻增产QTL导入9311之近等基因系的构建 总被引:4,自引:2,他引:4
以超级杂交中稻恢复系9311为受体和轮回亲本,马来西亚普通野生稻(O.rufipogon)为增产QTL yld1.1和yld2.1的供体进行杂交和连续回交,各世代采用分子标记辅助选择,至BC6F1后自交,得到BC6F2群体,通过分子标记检测,获得分别携带野生稻增产QTL yld1.1、yld2.1及同时携带yld1.1和yld2.1的3套近等基因系.对同时携带yld1.1和yld2.1的近等基因系进行遗传背景分析,发现其与受体9311的遗传组成有93.9%一致.田间试验表明,野生稻增产QTL近等基因系的产量均高于受体,说明将野生稻增产QTL转移至杂交稻恢复系中,能提高其产量水平,且2个QTL的增产效果大于单个QTL的效果. 相似文献
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Progress on Transferring Elite Genes from Non-AA Genome Wild Rice into Oryza sativa through Interspecific Hybridization 总被引:1,自引:0,他引:1
The progress of research on transferring elite genes from non-AA genome wild rice into Oryza sativa through interspecific hybridization are in three respects, that is, breeding monosomic alien addition lines (MAALs), constructing introgression lines (ILs) and analyzing the heredity of the characters and mapping the related genes. There are serious reproductive barriers, mainly incrossability and hybrid sterility, in the interspecific hybridization of O. sativa with non-AA genome wild rice. These are the ‘bo... 相似文献
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CHEN Jie Hafeez Ur Rahman BUGHIO CHEN Da-zhou LIU Guang-jie ZHENG Kang-le ZHUANG Jie-yun 《水稻科学》2006,13(1):15-21
Genetic variation in cultivated rice has been reduced tremendously during domestication and modern plant breeding. As a consequence, slow progress in rice breeding and genetic vulnerability in rice production has been witnessed since 1980s. Wild relatives of cultivated rice remain to be highly diversified and hold various genes conferring resistance to biotic and abiotic stresses, thus providing a valuable gene pool for rice genetic improvement. More and more attentions have been paid to intro… 相似文献
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中国栽培稻及其近缘野生种叶绿体DNA的限制性片段长度多态性分析 总被引:8,自引:1,他引:8
对中国现存的七省(区)的17份中国普通野生稻(其中广西普通野生稻6份,东乡野生稻5份,广东、湖南各2份,福建及云南景洪普通野生稻各1份)及28份栽培稻地方品种的叶绿体DNA进行了限制性内切酶酶切分析。28份中国栽培稻被分成三类,C1、C2和C3。其中C2叶绿体基因组类型仅有1份材料,为一个籼稻品种。两个主要类型C1和C3分别对应于粳型和籼型,说明中国栽培稻在叶绿体基因组存在籼、粳分化。17份中国普通野生稻的叶绿体DNA用同样3种内切酶酶切,共产生两种类型。它们分别与栽培稻中的C1和C3相同,其中C1类型占主要,为94.1%(16/17),具C3型叶绿体基因组的野生稻为1份广西材料。此外没有检测到新的类型。这说明在中国普通野生稻中也存在对应于栽培稻籼型和粳型两种不同的叶绿体基因组类型,而且是以对应于粳型的C1型叶绿体基因组类型材料为主。从大多数中国普通野生稻具有与粳型栽培稻相同的叶绿体基因组类型,可以推测粳稻起源于中国的可能性很大。 相似文献
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我国三种野生稻及其与栽培稻种间杂种外稃表面显微特征的比较观察 总被引:6,自引:1,他引:5
用扫描电镜对栽培稻的两个籼型品种(Oryza sativa subsp. indica)、普通野生稻(O.rufipogon)、药用野生稻(O. officinalis)、疣粒野生稻(O. meyeriana)及野生稻与栽培稻的种间杂种F1的外稃表面显微特征进行了比较研究,观察到外稃表面的显微特征有明显的种间差异,并初步概述了三种野生稻的乳突特征。栽培稻与野生稻的种间杂种外稃显微特征受亲本影响,其中乳突座间距、列宽主要受野生稻亲本影响;底座以上的峰突特征如峰距、峰数则表现为栽培稻亲本的特征;乳突分布密度表现为超亲现象。 相似文献
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Nie Yuanyuan Xia Hui Ma Xiaosong Lou Qiaojun Liu Yi Zhang Anling Cheng Liang Yan Longan Luo Lijun 《水稻科学》2022,29(3):277-287
Deep rooting is an important trait in rice drought resistance. Genetic resources of deep-rooting varieties are valuable in breeding of water-saving and drought-resistant rice. In the present study, 234 BC2F7 backcross introgression lines were derived from a cross of Dongye 80 (an accession of Dongxiang wild rice as the donor parent) and R974 (an indica restorer line as the recurrent parent). A genetic linkage map containing 1 977 bin markers was constructed by ddRADSeq for QTL analysis. Thirty-one QTLs for four root traits (the number of deep roots, the number of shallow roots, the total number of deep roots and the ratio of deep roots) were assessed on six rice chromosomes in two environments (2020 Shanghai and 2021 Hainan). Two of the QTLs, qDR5.1 and qTR5.2, were located on chromosome 5 in a 70-kb interval. They were detected in both environments. qDR5.1 explained 13.35% of the phenotypic variance in 2020 Shanghai and 12.01% of the phenotypic variance in 2021 Hainan. qTR5.2 accounted for 10.88% and 10.93% of the phenotypic variance, respectively. One QTL (qRDR2.2) for the ratio of deep roots was detected on chromosome 2 in a 210-kb interval and accounted for 6.72% of the phenotypic variance in 2020. The positive effects of these three QTLs were all from Dongxiang wild rice. Furthermore, nine and four putative candidate genes were identified in qRDR2.2 and qDR5.1/qTR5.2, respectively. These findings added to our knowledge of the genetic control of root traits in rice. In addition, this study will facilitate the future isolation of candidate genes of the deep-rooting trait and the utilization of Dongxiang wild rice in the improvement of rice drought resistance. 相似文献