共查询到20条相似文献，搜索用时 46 毫秒
1.
Jorge Luis Fuentes Fernando José Correa-Victoria Fabio Escobar Gustavo Prado Girlena Aricapa Myriam Cristina Duque Joe Tohme 《Euphytica》2008,160(3):295-304
The present work was conducted to identify microsatellite markers linked to the rice blast resistance gene Pi-1(t) for a marker-assisted selection program. Twenty-four primer pairs corresponding to 19 microsatellite loci were selected from
the Gramene database (www. gramene.org) considering their relative proximity to Pi-1(t) gene in the current rice genetic map. Progenitors and DNA bulks of resistant and susceptible families from F3 segregating populations of a cross between the near-isogenic lines C101LAC (resistant) and C101A51 (susceptible) were used
to identify polymorphic microsatellite markers associated to this gene through bulked segregant analysis. Putative molecular
markers linked to the blast resistance gene Pi-1(t) were then used on the whole progeny for linkage analysis. Additionally, the diagnostic potential of the microsatellite markers
associated to the resistance gene was also evaluated on 17 rice varieties planted in Latin America by amplification of the
specific resistant alleles for the gene in each genotype. Comparing with greenhouse phenotypic evaluations for blast resistance,
the usefulness of the highly linked microsatellite markers to identify resistant rice genotypes was evaluated. As expected,
the phenotypic segregation in the F3 generation agreed to the expected segregation ratio for a single gene model. Of the 24 microsatellite sequences tested, six
resulted polymorphic and linked to the gene. Two markers (RM1233*I and RM224) mapped in the same position (0.0 cM) with the
Pi-1(t) gene. Other three markers corresponding to the same genetic locus were located at 18.5 cM above the resistance gene, while
another marker was positioned at 23.8 cM below the gene. Microsatellite analysis on elite rice varieties with different genetic
background showed that all known sources of blast resistance included in this study carry the specific Pi-1(t) allele. Results are discussed considering the potential utility of the microsatellite markers found, for MAS in rice breeding
programs aiming at developing rice varieties with durable blast resistance based on a combination of resistance genes.
Centro Internactional de Agricultura Tropical (CIAT) institute where the research was carried out 相似文献
2.
Pingyong Sun Jinling Liu Yue Wang Nan Jiang Suhua Wang Yangshuo Dai Jia Gao Zhiqiang Li Sujun Pan Dan Wang Wei Li Xionglun Liu Yinghui Xiao Erming Liu Guo-Liang Wang Liangying Dai 《Euphytica》2013,192(1):45-54
Rice blast, caused by the fungus Magnaporthe oryzae, is the most devastating fungal disease of rice. Mowanggu, a local japonica cultivar in Yunnan Province, China, confers broad-spectrum resistance to this pathogen. To identify the resistance gene(s) in Mowanggu, we obtained an F2 population and 280 F8 recombinant inbred lines (RILs) from a cross between Mowanggu and CO39, a highly susceptible indica cultivar. A linkage map with 145 simple sequence repeat (SSR) and single feature polymorphism markers over 12 chromosomes was constructed using the 280 RILs. The resistance evaluation of the F2 and F8 populations in both the growth chamber and in a natural rice blast nursery showed that a single dominant gene controls blast resistance in Mowanggu. Moreover, nine quantitative trait loci, which were responsible for different partial resistance components, were mapped on chromosomes 2, 3, 6, 8, 9, and 12, making contributions to the phenotypic variation ranging from 3.03 to 6.18 %. The dominant resistance gene, designated Pi49, was mapped on chromosome 11 with genetic distance of 1.01 and 1.89 cM from SSR markers K10 and K134, respectively. The physical distance between K10 and K134 is about 181 kb in the Nipponbare genome. The Pi49 gene accounted for the major phenotypic variation of disease severity in the growth chamber (where plants were inoculated with single blast isolates) and also accounted for most of the phenotypic variance of disease severity, lesion number, diseased leaf area, and lesion size in the blast nursery. Our study not only identified tightly linked markers for introgression of Pi49 into elite rice cultivars via marker-aided selection but also provides a starting point for map-based cloning of the new resistance gene. 相似文献
3.
在福建省沙县稻瘟病重发区,对1092份水稻材料进行连续3年的田间苗叶瘟和穗茎瘟的自然鉴定,供试材料中高抗、抗、中抗、中感、感和高感材料分别为124、99、121、545、156和47份。利用14个与抗性基因紧密连锁的SSR标记及3个源于抗病基因序列的显性标记,对其中130份抗性较好的材料进行了遗传背景分析,14个SSR标记引物共扩增到87个等位位点,每一标记的等位位点变幅为2～13个,平均为6.2个,每个SSR位点的多态性信息含量(PIC)变化范围为0.379～0.9,平均为0.695;不同抗性亲本材料出现抗性基因的标记为2～9个,其中与抗病基因Pi35、Pi-yt及Pi-ta相对应的标记RM1003、RM202和YL155/YL87的概率较高。 相似文献
4.
Screening of rice germplasm against Asian rice gall midge, Orseolia oryzae (Wood-Mason), biotypes in India has led to identification of over 300 resistant rice genotypes. However, only ten resistance genes have been characterized so far. Identification of new genes through classical allelism test is tedious and time consuming. We propose to use closely linked flanking Simple Sequence Repeat (SSR) markers in allelism tests for identification of resistance genes. Of the ten known gall midge resistance genes, eight have been tagged and mapped. The Gm1 and Gm2 genes have closely linked flanking markers. Hence SSR markers RM219 and RM444, flanking the gene Gm1, and RM317, RM241 along with the SCAR marker F8, flanking the gene Gm2, were selected for this study. Tests with one set of 13 genotypes likely to carry Gm1 and another set of 17 genotypes suspected to contain Gm2 suggested the presence of the respective allele in all the 13 and 15 genotypes from these sets, respectively. Classical allelism test perfectly matched with the markers test. There were two exceptions involving amplification with RM444 in cultivar Kavya and with RM241 in genotype AE20, suggesting a single recombination which could have resulted in the mismatch. All the three markers in the genotype Bhumansan and the two flanking markers RM317 and F8 in AE20 indicated the absence of the Gm2 allele. This was validated through a classical test, revealing a segregation ratio of 15 resistant: 1 susceptible F2 progeny of both the crosses between the Gm2 source Phalguna and these genotypes. We performed the allelism test with the markers on another set of 56 randomly selected gall midge resistant genotypes to discover possible sources of new resistance genes. 相似文献
5.
高空气球搭载空间诱变品系稻瘟病抗性变异基因遗传分析及分子标记研究 总被引：2，自引：0，他引：2
在前期对空间诱变品系进行稻瘟病表型鉴定的基础上,选取部分空间诱变粤香占和青华占抗性变异高代品系（6代以上）进行稻瘟病抗性变异基因的遗传分析及分子标记研究。经遗传分析,发现突变品系YX03和QH06对菌株01—18a的抗病性分别受一对显性主效基因控制,而突变品系YX04和QH05分别受两对显性主效基因控制;并将QH06的抗病突变基因定位于第8染色体,与微卫星标记RM547连锁,遗传距离为8．5cM。研究结果表明空间诱变可以产生稻瘟病抗性基因的变异。 相似文献
6.
7.
8.
Moytri RoyChowdhury Yulin Jia Aaron Jackson Melissa H. Jia Robert Fjellstrom Richard D. Cartwright 《Euphytica》2012,184(1):35-46
The Pi-z gene in rice confers resistance to a wide range of races of the rice blast fungus, Magnaporthe oryzae. The objective of this study was to characterize Pi-z in 111 rice germplasm accessions using DNA markers and pathogenicity assays. The existence of Pi-z in rice germplasm was detected by using four simple sequence repeat (SSR) markers (RM527, AP4791, AP5659-1, AP5659-5) closely
linked to Pi-z, and was verified using pathogenicity assays with an avirulent strain (IE1k) and two virulent races (IB33 and IB49). Among
111 germplasm accessions evaluated, 73 were found to contain the Pi-z gene using both SSR markers and pathogenicity assays. The remaining 38 germplasm accessions were found to be inconsistent
in their responses to the blast races IB33, IEIk and IB49 with expected SSR marker alleles, suggesting the presence of unexpected
SSR alleles and additional R gene(s). These characterized germplasm can be used for genetic studies and marker-assisted breeding for improving blast resistance
in rice. 相似文献
9.
24个单基因系对黑龙江省优势菌群的抗性及联合抗病性分析 总被引：2，自引：0，他引：2
为了明确24个抗稻瘟病基因在黑龙江省的抗性水平及其利用价值,将2006年黑龙江省优势菌株和强致病力菌株接种于以丽江新团黑谷为轮回亲本培育而成的含有24个抗瘟单基因系上。结果表明：水稻抗瘟基因Pi9(t)、pi-z5对优势和强致病力菌株抗性最强,是较好的抗源可以广泛的利用;对2个抗瘟基因的联合抗病性系数分析,结果表明基因两两搭配后的联合抗病系数最高、联合致病系数最低的组合是pi-9(t)*pi-z5 和pi-9(t)*pi-ta2 ;分析得出,黑龙江省稻瘟病菌致病力较强,大部分抗瘟基因都已失去抗性,急需引进新的抗瘟基因。 相似文献
10.
不断挖掘和克隆抗稻瘟病新基因, 是解析水稻抗病分子遗传机制和培育抗稻瘟病新品种的重要基础。Pi47是笔者从广谱、持久抗稻瘟病湖南地方品种湘资3150中鉴定的稻瘟病抗性基因, 前期研究将其初步定位于第11染色体标记RM224和RM5926间。本研究利用3个Pi47单基因系与感病亲本CO39杂交F2群体1687个感病单株对Pi47精细定位, 利用6个STS标记对3个单基因系进行背景分析, 采用生物信息学方法进行了候选基因分析。结果表明, Pi47被精细定位于CAPS标记S32与K33间0.24 cM区域的171.2 kb物理区间内, 背景分析将Pi47进一步缩小至SC12和K33间67.8 kb的区间内; 该区间含有8个结构基因, 其中2个编码NBS-LRR抗病类似蛋白, 为Pi47的候选功能基因。稻瘟菌抗谱比较分析发现, Pi47单基因系与其定位区间内4个Pik位点的等位基因Pik、Pikm、Pikh和Pikp的近等基因系抗谱不同。这些结果为进一步克隆Pi47和利用其进行分子标记辅助选择培育抗稻瘟病水稻新品种奠定了基础。 相似文献
11.
稻瘟病苗瘟叶瘟和穗颈瘟的相关性分析 总被引：8，自引：0，他引：8
采用温室人工接菌法探讨水稻稻瘟病苗瘟、叶瘟和穗颈瘟的相关性,研究结果表明,稻瘟病苗瘟、叶瘟和穗颈瘟三者之间存在着一定的正相关性,相关程度因水稻品种、稻瘟病菌生理小种的不同而有所差异。此外,对水稻品种温室苗瘟抗性率与田间叶瘟抗性率、穗颈瘟抗性率之间的相关性进行研究,结果表明温室苗瘟抗性率与自然病圃叶瘟抗性率表现正相关关系(r=0.5435),温室苗瘟抗性率与自然病圃穗颈瘟抗性率表现极显著正相关关系(r=0.7583**,p<0.01),自然病圃叶瘟抗性率与穗颈瘟抗性率呈显著正相关关系(r=0.6322*,p<0.05)。因此,认为利用可控温室代替田间进行水稻品种稻瘟病抗性鉴定是可行的,而且根据苗瘟、叶瘟的抗性鉴定结果推测穗颈瘟的抗性基本上也是可行的。 相似文献
12.
稻瘟病是水稻生产中危害最为严重的病害之一,种植抗病品种是抵御稻瘟病危害的有效措施。本研究利用吉粳809的2个亲本材料吉粳88与93072配制的回交分离群体进行稻瘟病人工接种,采用抗、感极端分池法定位双亲的稻瘟病抗性基因,结合基因型分析,推断吉粳809的抗性基因组成。结果表明,回交群体对强致病菌GD9-1表现为4个主效抗病基因Pi-2(t)、Pi-7-1(t)、Pi-7-2(t)和Pi-11(t)分离,对弱致病菌GD19-1表现单个主效抗病基因Pi-2(t)分离,其中Pi-2(t)基因同时抗2个菌株。除Pi-2(t)位点抗性等位基因来自吉粳88,其余3个位点的抗性等位基因均来自93072。比较基因组研究表明,Pi-2(t)可能与Pi-b等位,Pi-11(t)可能与Pi-47(t)或Pik等位,而Pi-7-1(t)和Pi-7-2(t)是2个新的抗性位点,分别与RM21260和RM8037连锁,遗传距离为0.11 cM和6.97 cM。利用与上述4个抗病位点紧密连锁的SSR标记和来自3K水稻种质资源重测序开发的55K芯片鉴定抗性位点吉粳809与双亲基因型的异同,推断吉粳809抗性基因组成,发现吉粳809携带轮回亲本吉粳88的Pi-2(t)和来自供体亲本93072的Pi-11(t) 2个基因,合理地解释了吉粳809抗性明显好于吉粳88的原因。对如何通过不同主效抗性基因聚合特别是充分利用原来抗病品种中“丧失”抗性残效基因来改良品种的稻瘟病抗性进行了讨论。 相似文献
13.
Kei Matsushita Nobuko Yasuda Thinlay Shinzo Koizumi Taketo Ashizawa Yoshihiro Sunohara Shuichi Iida Osamu Ideta Hideo Maeda Yoshikatsu Fujita 《Euphytica》2011,180(2):273-280
The rice cultivar ‘Chumroo’ is commonly cultivated in the mid- and high-altitude areas of Bhutan. This cultivar has shown
durable blast resistance in that area, without evidence of breakdown, for over 20 years. Chumroo was inoculated with 22 blast
isolates selected from the race differential standard set of Japan. The cultivar showed resistance to all the isolates. To
identify the resistance gene(s), Chumroo was crossed with a susceptible rice cultivar, Koshihikari. The F1 plants of the cross showed resistance. Segregation analyses of 300 F3 family lines fitted the segregation ratio of 1:2:1 and indicated that a single dominant gene controls the resistance to a
blast isolate Ao 92-06-2 (race 337.1). The Chumroo resistance locus (termed Pi46(t)) was mapped between two SSR markers, RM6748 and RM5473, on the terminal region of the long arm of chromosome 4, using linkage analysis with SSR markers. The nearest marker, RM5473, was linked to the putative resistance locus at a map distance of 3.2 cM. At the chromosomal region, no true resistance genes
were identified, whereas two field resistance genes were present. Therefore, we designated Pi46(t) as a novel blast resistance locus. 相似文献
14.
一个粳稻来源抗稻瘟病基因的鉴定、遗传分析和基因定位 总被引：1，自引：0，他引：1
7001S是一个广谱抗稻瘟病的粳稻两用核不育系,对来自全国不同稻区的22株稻瘟病菌系均表现为高度抗性。通过构建7001S/80-4B F2群体的遗传分析和初步定位表明,F2分离单株对稻瘟病菌的抗性呈明显的抗、感双峰分布,抗感分离符合3﹕1的理论比例,说明粳稻7001S对稻瘟病菌的抗性由1对显性核基因或一个显性QTL位点控制,并将该基因初步定位于第11染色体长臂末端。进一步通过扩大遗传群体和分子标记开发,利用基于BSA的隐性群体分析技术,将目的基因精细定位于P21-2415和RM27322之间约310 kb的范围内,并获得了可用于分子标记辅助选择的紧密连锁和共分离分子标记,同时对目标基因所在区域进行基因预测,初步确定了候选基因。为进一步开展该抗稻瘟病基因的克隆、功能验证和抗病机理研究,以及通过分子标记辅助选择技术培育抗稻瘟病水稻新品种等工作奠定了基础。 相似文献
15.
为了明确黑龙江省水稻品种资源稻瘟病抗性,挖掘优异种质资源,适时了解黑龙江省生理小种群体变化特征。采用中国生理小种命名方法,通过苗期喷雾接菌鉴定,将2013-2014年黑龙江省的稻瘟病菌株划分为7个群42个生理小种,优势小种为ZD5和ZD7,出现频率分别为19.77%和12.21%,总频率为31.98%;通过苗期抗病性表现,筛选出宽抗谱品种14份,这些品种携带2~7个抗稻瘟病基因,绥粳12+合江23(Pi9、Pi20、Pi33、Pi54、Pik)、牡丹江26+龙粳31(Pi9、Pi20、Pi33、Pi54、Pita、Pik)、牡丹江26+合江23(Pi9、Pi20、Pi33、Pi54、Pik)等29个在抗稻瘟病育种生产上将具有较好防病效果的组合,并且能够聚合多个抗性基因,提高抗性水平、拓宽抗谱;其中龙粳31与其他9个品种的配对组合均为最优组合,对稻瘟病具有较高抗性;这14份宽抗谱品种是抗稻瘟病育种较好的抗源材料;部分品种如垦稻15、龙粳23和牡丹江25,仅携带2个本研究鉴定的基因,这些品种可能是携带未知抗性基因的新抗源,可作为进一步鉴定和寻找抗性基因的试验材料。 相似文献
16.
滇一型杂交粳稻恢复基因的分子鉴定研究 总被引：5，自引：0，他引：5
用位于水稻第10染色体的微卫星标记OSR33、RM228对285份滇型材料进行恢复基因的分子鉴定研究，结果表明：①OSR33、RM228标记的基因型依材料的不同而出现分子量不同的带型，且带型与材料有关；②OSR33和RM228鉴定材料的准确率分别为96％和90％；OSR33、RM228标记的基因型值与黑染花粉率极显著正相关，可用于鉴别恢复系；③用Mapmaker／QTL软件分析供试材料的表现型，在OSR33、RM228之间，探测到1个与育性恢复有关的主效QTL，可解释83．2％的表型变异，与OSR33和RM228的遗传距离分别为3．3cM和7．0cM。 相似文献
17.
Rice blast resistance gene ‘Pi-z’ present in rice genotypes, Zenith and Fukunishiki, represents a potential source of blast resistance for the north-western
Himalayan region of India. We tested the reliability of microsatellite markers linked to Pi-z for assessing blast resistance phenotype in crosses of commercial importance. A new set of microsatellite markers linked
to Pi-z was also developed by exploiting the publicly available marker and genomic resources of rice. Of the three previously reported
markers for Pi-z, only MRG5836 was suitable for the marker assisted selection of Pi-z. Among the 17 microsatellites selected from the putative region of Pi-z locus, two, RM8225 and RM8226 cosegregated with MRG5836 and were located at distance of 1.2–4.5 cM from the gene. A new microsatellite marker ‘SSR236’ was developed from the (CT)16 repeat of PAC clone P0502B12, which exhibited closer linkage (0.6–1.2 cM) to Pi-z. Survey of the allelic diversity at the loci of the Pi-z linked microsatellite markers revealed that the Fukunishiki and Zenith type alleles were not present in majority of the local
indica rice genotypes. As these markers are polymorphic between the Pi-z donors and a great majority of local indica rices tested, they can be used as a selection tool in rice breeding programs aimed at improving the blast resistance of local
rices. 相似文献
18.
Sang-Nag Ahn Yeon-Kyu Kim Ha-Cheol Hong Seong-Sook Han Soo-Jin Kwon Hae-Chune Choi Huhn-Pal Moon Susan R. McCouch 《Euphytica》2000,116(1):17-22
A single dominant blast resistance gene conferring resistance to a Korean rice blast isolate was identified in rice variety
`Suweon 365'. We report the chromosomal localization and molecular mapping of this blast resistance gene designated as Pi-18, which confers resistance to Korean isolate `KI-313' of the blast pathogen. To know whether there is a relationship among
genes conditioning resistance to location-specific isolates of the blast pathogen and thereby to identify linked markers to
resistance gene for isolate KI-313 collected in Korea, RFLP markers previously reported to be linked to major blast resistance
genes in different rice germplasm and other markers mapped to nearby regions were surveyed for polymorphism between a resistant
(`Suweon 365') and a susceptible (`Chucheongbyeo') parent. Linkage associations of the RFLP markers with the resistance gene
were verified using an F2 and F3 segregating population of known blast reaction. RFLP analysis showed that Pi-18 was located near the end of chromosome 11, linked to a single copy clone RZ536 at a distance of 5.4 centiMorgans (cM) and
that this gene was different from Pi-1(t). An allelism test revealed that this gene was also different from Pi-k. Currently, a combination of RAPD and microsatellite primers is being employed to find additional markers in this region.
Tightly linked DNA markers will facilitate selection for resistant genotypes in breeding programs and provide the basis for
map based cloning of this new blast resistance gene.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
转苦瓜几丁质酶基因McCHIT1水稻及其稻瘟病抗性 总被引：3，自引：0，他引：3
稻瘟病是危害水稻的最严重病害之一,探索利用外源基因提高水稻抗稻瘟病水平对现代育种具有重要意义。本研究从T2代起逐代增加抗性选择压,采用苗期人工混合接种和病圃田自然诱发等鉴定方法,对转基因水稻后代进行稻瘟病抗性鉴定和筛选,在T5代获得了7个稻瘟病抗性极显著增强的转McCHIT1基因水稻稳定株系。通过7个生理群26个生理小种的115个稻瘟病有效单孢菌株苗期抗谱测定,这7个株系的抗病频率为52.2%~61.4%,比受体对照缙恢35 (36.8%)高16个百分点以上,主要增加了对ZE群生理小种的抗性,提高了对ZG群、ZF群和优势种群ZB群生理小种的抗性。C36-2-1、C21-6-2、C21-3-1等3个株系的结实率达80%以上,是丰抗结合较好的转McCHIT1基因株系。McCHIT1基因具有广谱抗性,将其遗传转化水稻,采用“逐代增加选择压,抗中选抗”的方法,可筛选出稻瘟病抗性优良、抗谱明显拓宽、产量性状较好的转基因稳定株系。 相似文献
20.
1994年10月至1995年5月，在美国阿肯色大学水稻研究推广中心的温室，对5个美国水稻品种Katy、Lemont、L202、RA73和Bond、其F1、F2和部分组合的F3随机选系，用4个主要美国稻瘟病菌小种IE-1k、IB-33、IB-49和IC-17进行接种鉴定，通过完全双列杂交进行遗传分析的研究。结果表明：所有的亲本对IB-33感病；除RA73外，其他亲本对IE 相似文献