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Dissection of genetic overlap of salt tolerance QTLs at the seedling and tillering stages using backcross introgression lines in rice

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Science China(Life Sciences) 2008年第7期51卷 583-591页

作者： ZANG JinPing 1 ,SUN Yong 1 ,WANG Yun 1 ,YANG Jing 1 ,LI Fang 1 ,ZHOU YongLi 1 ,ZHU LingHua 1 , Reys JESSICA2,Fotokian MOHAMMADHOSEIN 2,XU JianLong 1&LI ZhiKang 1,2 1institute of Crop Sciences/National Key Facility for Crop Gene Resources&Genetic Improvement,Chinese Academy of Agricul- tural Sciences,Beijing 100081,China 2international rice research institute,dapo box 7777,metro manila,philippines 1. institute of Crop Sciences/National Key Facility for Crop Gene Resources & Genetic Improvement Chinese Academy of Agricultural Sciences Beijing 100081 China 2. international rice research institute DAPO Box 7777 Metro Manila Philippines

QTLs for salt-tolerance(ST)related traits at the seedling and tillering stages were identified using 99 BC2F8 introgression lines(IL)derived from a cross between IR64(indica)as a recurrent parent and Binam(japonica)from Iran as the donor *** QTLs affecting survival days of seedlings(SDS), score of salt toxicity of leaves(SST),shoot K + concentration(SKC)and shoot Na + concentration(SNC) at the seedling stage and 22 QTLs underlying fresh weight of shoots(FW),tiller number per plant(TN) and plant height(PH)at the tillering stage were *** QTLs detected at the tillering stage showed obvious differential expression to salt stress and were classified into three types based on their differential *** I included 11 QTLs which were expressed only under the non-stress *** II included five QTLs expressed in the control and the salt stress conditions,and three of them(QPh5,QPh8 and QTn9)had similar quantity and the same direction of gene effect,suggesting their expression was less influenced by salt *** III included six QTLs which were detectable only under salt stress,suggesting that these QTLs were apparently induced by the *** QTLs affecting trait difference or trait stability of ILs between the stress and non-stress conditions were identified and the Binam alleles at all loci except QPh4,QTn2 and QFw2a decreased trait *** three QTLs less influenced by the stress and 13 QTLs affecting trait stability were considered as ST QTLs which contributed to *** the distribution of QTLs detected at the seedling and tillering stages,most(69%)of them were genetically *** four were the same or adjacent regions on chromosomes 1,2,8 and 11 harboring ST QTLs detected at the two stages,suggesting that partial genetic overlap of ST across the two stages *** is likely,therefore,to develop ST rice variety for both stages by pyramiding of ST QTLs of different stages or selection against the ove

关键词： rice salt tolerance(ST) quantitative trait loci(QTL) genetic overlap

Comparative Analysis of Genetic Diversity and Structure in rice Using ILP and SSR Markers

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rice science 2010年第4期17卷 257-268页

作者： HUANG Ming XIE Fang-min CHEN Li-yun ZHAO Xiang-qian L. JOJEE D. MADONNA rice research institute Hunan Agricultural University Changsha 410128 China Plant Breeding Genetics and Biotechnology Division International Rice Research Institute Metro Manila DAPO Box 7777 Philippines Grain Quality Nutrition and Postharvest Center International Rice Research Institute Metro Manila DAPO Box 7777 Philippines

Genetic diversity of 36 rice entries from the United States Department of Agriculture （USDA） rice collection was assessed using 103 ILP （intron length polymorphism） and 54 SSR （simple sequence repeats） markers. A total of 236 and 332 alleles were detected by the ILP and SSR markers, respectively. On average, the SSR markers produced higher polymorphism information content value and number of alleles than the ILP markers. Whereas the Nei＇s genetic distance measured using the SSR markers was much higher than that measured using the ILP markers. Manters test indicated that there was a statistically significant correlation （r=0.827, P〈0.001 ） between the two marker systems. UPGMA clustering based on the ILP and SSR markers resulted in consensus dendrograms. The cophenetic correlation coefficient （r=0.918, 0.878 and 0.924, P〈0.001 for the ILP, SSR and combined markers, respectively） showed a highly accurate dendrogram represented the genetic distance among these entries. The 36 entries were divided into four groups. Four African Oryza glaberrima accessions were clustered within a distinct group （I）, and the remaining entries were separated into three groups （11, III and IV）. All the entries could be also clustered into two main groups： One was composed of III and IV, considered as indica group, and the other was composed of I （O. glaberrima） and II （japonica-like）. Model-based cluster analysis revealed that the japonica-like group maintained very pure ancestry while the indica group shared mixed ancestry, especially for group III, which had seven admixtures sharing from 19.5% to 30.0% of ancestry with group IV （based on SSR markers）. It is suggested that ILP and SSR markers could be very useful for the genetic study and breeding in rice.

关键词： rice genetic diversity cluster analysis structure simple sequence repeats intron length polymorphism

Tagging Blast Resistance Gene Pi 1 in rice (Oryza sativa) Using Candidate Resistance Genes

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rice Science 2004年第Z1期 251-254页

作者： Menchu BERNADO Entomology and Plant Pathology Division international rice research institute dapo P.O. box 7777.metro manila philippines

An F3 population derived from C101LAC/CO39 containing 90 lines was analyzed for blast resistance with 48 candidate genes developed from resistance gene analogs （RGA） and suppression subtractive library. Genetic analysis confirmed that blast resistance of the population was controlled by a single gene Pi 1. One of the candidate genes, R10 was identified as associated with the blast resistance gene on the long arm of chromosome 11 and mapped using a DH population derived from Azucena/IR64. A pair of PCR based primers was designed based on the sequence of R10 for marker-aided selection of the blast resistance gene. The recombination frequency between Pi 1 and the marker was estimated as 1.28%. It suggested that strategy of employing candidate genes is useful for gene identification and mapping. A new RFLP marker and the corresponding PCR marker for tagging of Pi 1 were provided.

关键词： rice candidate gene marker-aided selection blast resistance

QTL detection of concentration of micro-nutrients and metal elements in rice

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QTL detection of concentration of micro-nutrients and metal ...

Genetic background effects on introgression,QTL expression and cryptic genomic variation due to subspecific differentiation in rice

2010中国作物学会学术年会

作者： Xia Hu~1,Qian Jia~1,Qin Xu~1,Yuming Shi~2,Yong Sun~1,Linghua Zhu~1,Zhikang Li~(1,3) (1institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081,China 2institute of rice, Guangxi Academy of Agricultural Sciences,Nanning,530007,China 3international rice research institute,dapo box7777,manila,philippines.

Iron,zinc and selenium are important micro-nutrients to human *** of micro-nutrients is a serious problem associated with resource poor population in many developing *** high cost and technical difficulty in testing of micro-nutrients,QTL identification and marker-assisted pyramiding of multiple favorable QTLs are considered as a practical strategy to develop micro-nutrients dense *** this study,two BC

关键词： micro-nutrient iron zinc selenium QTL mapping genetic background effect

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Genetic background effects on introgression,QTL expression a...

Evaluation of screening effectiveness on stress tolerance in advanced introgression populations in rice

2010中国作物学会学术年会

作者： Yun Wang~(1,2),Lirui Cheng~1,Yong Sun~1,Wenshen Wang~1,Rongshen Guan~1,Linghua Zhu~1, Zhikang Li~(1,3) (1 institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081,China 2Shenyang Agricultural University,Shenyang 110161,China 3international rice research institute,dapo box7777,manila,philippines.

Two large sets of reciprocal introgression lines(ILs) derived a japonica variety ’Lemont’ and indica variety ’Teqing’,were analyzed using molecular markers to understand the transmission pattern of donor segments in reciprocal indica/japonica recipients of rice and the effects of genetic background on QTL expression of flag leaf width(LW) and spikelet number per panicle(SNP) under the two diverse environments (Beijing and Hainan).Comparison of the linkage maps from the two ILs and RIL populations from the same cross revealed a high frequency and genomewide distribution of inverted marker orders,suggesting the

关键词： genetic background effect intrasubspecific cryptic genomic variation subspecific differentiation genetic load Oryza sativa L.

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Evaluation of screening effectiveness on stress tolerance in...

2010中国作物学会学术年会

作者： Lijun Meng~1,Jianlong Xu~1,Xiuyun Lin~2,Haibo Sun~3,Xiufang Ma~4,Linghua Zhu~1,Zhikang Li~(1,5) (1institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081,China 2institute of rice,Jilin Academy of Agricultural Sciences,Changchun,136100,China 3institute of Crop,Tianjin Academy of Agricultural Sciences,Tianjin,300112,China 4institute of rice,Liaoning Academy of Agricultural Sciences,Shenyang,110101, China 5international rice research institute,dapo box7777,manila,philippines.

Using BCF advanced backcross populations derived from crosses between Chaoyoul as recurrent parent and 11 diverse entries(eight indica varieties and threejaponica varieties) as donor parents,salt tolerance(ST) at the seedling stage and the stage from tillering to mature,cold tolerance(CT) at the booting stage and heat tolerance(HT) at flowering stage were identified and screened under the stress intensity when the check,Chaoyoul completely died or almost infertility under *** percentage of ST plants was much difference among various populations at seedling stage and the stage from tillering

关键词： rice Backcross introgression Salt tolerance Heat tolerance Cold tolerance Hidden gene

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稻草还田对晚稻稻田甲烷排放的影响

土壤学报 2002年第2期39卷 170-176页

作者：陈苇卢婉芳段彬伍 Wassmann R Lantin RS 中国水稻研究所杭州310006 国际水稻研究所

晚稻稻田的甲烷排放呈现前高后低特点 ,稻田甲烷的日排放速率与日均气温具有良好的正相关。稻草翻施使稻田甲烷排放量上升 5 1 .1 1 % ,而采用稻草表施的方法甲烷排放量仅增加 33.98%。水稻分蘖期是稻田甲烷排放的重要时期 ,其甲烷排放... 详细信息

晚稻稻田的甲烷排放呈现前高后低特点 ,稻田甲烷的日排放速率与日均气温具有良好的正相关。稻草翻施使稻田甲烷排放量上升 5 1 .1 1 % ,而采用稻草表施的方法甲烷排放量仅增加 33.98%。水稻分蘖期是稻田甲烷排放的重要时期 ,其甲烷排放量占水稻全生育期排放总量的 65 .6% ,施用稻草进一步加大水稻分蘖期的甲烷排放比例。与稻草翻施相比 ,稻草表施的甲烷减排突出表现在水稻分蘖期及一天中 1 2∶0 0～ 1 6∶0 0的甲烷排放高峰时段。土壤 5cm处温度的昼夜周期性变化与稻田甲烷排放的昼夜周期性变化具有高度相关性。

关键词：水稻稻草还田甲烷排放土壤水溶解温室气体大气污染