Maize （Zea mays L.）, one of main crops in the world, is easily susceptible to Aspergillusflavus （Link： fr） infection, resulting huge loses worldwide. Breeding for A. flavus resistance has been proved an efficient...Maize （Zea mays L.）, one of main crops in the world, is easily susceptible to Aspergillusflavus （Link： fr） infection, resulting huge loses worldwide. Breeding for A. flavus resistance has been proved an efficient way to solve the problem of aflatoxin contamination. Genetic analysis of the sources of resistance to A.flavus in maize is necessary for this purpose. The complete diallel crosses of 6 inbred lines with different resistance to A.flavus infection were implemented. Inoculation categorical data of each cross were analyzed with the additive-dominant and additive-dominant-epitasis genetic models. Results indicated some crosses fitted the 2 major genes with additive-dominant-epitasis genetic model. Others fitted the major gene and polygene mixed model. Moreover, the additive, dominant, and epitasis effects varied in crosses. The A.flavus resistance was controlled by both major gene and polygene.展开更多
Diseases are a potential threat to global food security but plants have evolved an extensive array of methodologies to cope with the invading pathogens. Non-host resistance and quantitative re- sistance are broad spec...Diseases are a potential threat to global food security but plants have evolved an extensive array of methodologies to cope with the invading pathogens. Non-host resistance and quantitative re- sistance are broad spectrum forms of resistance, and all kinds of resistances are controlled by extremely diverse genes called ＂R- genes＂. R-genes follow different mechanisms to defend plants and PAMP-induced defenses in susceptible host plants are referred to as basal resistance. Genetic and phenotypic diversity are vital in maize （Zea mays L.）; as such, genome wide association study （GWAS） along with certain other methodologies can explore the maximum means of genetic diversity. Exploring the complete genetic archi- tecture to manipulate maize genetically reduces the losses from hazardous diseases. Genomic studies can reveal the interaction be- tween different genes and their pathways. By confirming the specific role of these genes and protein-protein interaction （proteomics） via advanced molecular and bioinformatics tools, we can shed a light on the most complicated and abstruse phenomena of resistance.展开更多
Fine mapping of Helminthosporium turcicum resistance gene Ht2 is extremely valuable for map-based cloning of the Ht2 gene, gaining a better knowledge of the distribution of resistance genes in maize genome and marker-...Fine mapping of Helminthosporium turcicum resistance gene Ht2 is extremely valuable for map-based cloning of the Ht2 gene, gaining a better knowledge of the distribution of resistance genes in maize genome and marker-assisted selection in maize breeding. An F2 mapping population was developed from a cross between a resistant inbred line 77Ht2 and a susceptible inbred line Huobai. With the aid of RFLP marker analyses, the Ht2 gene was mapped between the RFLP markers UMC89 and BNL2.369 on chromosome 8, with a genetic distance of 0.9 cM to BNL2.369. There was a linkage between SSR markers UMC1202, BNLG1152, UMC1149 and the Ht2 gene by SSR assay. Among the SSR markers, the genetic distance between UMC1149 and the Ht2 gene was 7.2 cM. By bulked segregant analysis 7 RAPD-amplified products which were probably linked to the Ht2 gene were selected after screening 450 RAPD primers and converted the single-copy ones into SCAR markers. Linkage analysis showed that the genetic distance between the SCAR marker SD-06633 and the Ht2 gene was 0.4 cM. From these results, a part of linkage map around the Ht2 gene was constructed.展开更多
Droughts threaten crop yields worldwide.Compared to other major staple cereal crops,maize(Zea mays)is especially sensitive to drought,which can cause dramatic fluctuations in its yield potential.Natural maize populati...Droughts threaten crop yields worldwide.Compared to other major staple cereal crops,maize(Zea mays)is especially sensitive to drought,which can cause dramatic fluctuations in its yield potential.Natural maize populations contain many superior alleles that can enhance drought resistance through complex regulatory mechanisms.We recently de novo assembled the genome of a prominent drought-resistant maize germplasm,CIMBL55,and systematically dissected the genetic basis for its drought resistance on the genome,transcriptome,and epigenome levels.These analyses revealed 65 favorable drought resistance alleles in CIMBL55.Subsequently,we genetically verified the functions of the drought resistance genes ZmABF4,ZmNAC075,and ZmRtn16 and unraveled the function of ZmRtn16 on a molecular level.展开更多
基金supported by the National Natural Science Foundation of China (30771353)the Natural Science Foundation of Jiangsu Province, China(BK2007078)the Open Subject of Key Laboratory of Plant Functional Genomics,Ministry of Education of China (K06003)
文摘Maize （Zea mays L.）, one of main crops in the world, is easily susceptible to Aspergillusflavus （Link： fr） infection, resulting huge loses worldwide. Breeding for A. flavus resistance has been proved an efficient way to solve the problem of aflatoxin contamination. Genetic analysis of the sources of resistance to A.flavus in maize is necessary for this purpose. The complete diallel crosses of 6 inbred lines with different resistance to A.flavus infection were implemented. Inoculation categorical data of each cross were analyzed with the additive-dominant and additive-dominant-epitasis genetic models. Results indicated some crosses fitted the 2 major genes with additive-dominant-epitasis genetic model. Others fitted the major gene and polygene mixed model. Moreover, the additive, dominant, and epitasis effects varied in crosses. The A.flavus resistance was controlled by both major gene and polygene.
基金supported by the National Natural Science Foundation of China (31161140347)
文摘Diseases are a potential threat to global food security but plants have evolved an extensive array of methodologies to cope with the invading pathogens. Non-host resistance and quantitative re- sistance are broad spectrum forms of resistance, and all kinds of resistances are controlled by extremely diverse genes called ＂R- genes＂. R-genes follow different mechanisms to defend plants and PAMP-induced defenses in susceptible host plants are referred to as basal resistance. Genetic and phenotypic diversity are vital in maize （Zea mays L.）; as such, genome wide association study （GWAS） along with certain other methodologies can explore the maximum means of genetic diversity. Exploring the complete genetic archi- tecture to manipulate maize genetically reduces the losses from hazardous diseases. Genomic studies can reveal the interaction be- tween different genes and their pathways. By confirming the specific role of these genes and protein-protein interaction （proteomics） via advanced molecular and bioinformatics tools, we can shed a light on the most complicated and abstruse phenomena of resistance.
基金This work was jointly supported by the National Transgenic Plant Research Foundation of China (Grant No. J00-A-002) and the National Research Foundation for Key Techniques (The Explo-ration and Application of Crop Resources,2001-2003,04-012) of China.
文摘Fine mapping of Helminthosporium turcicum resistance gene Ht2 is extremely valuable for map-based cloning of the Ht2 gene, gaining a better knowledge of the distribution of resistance genes in maize genome and marker-assisted selection in maize breeding. An F2 mapping population was developed from a cross between a resistant inbred line 77Ht2 and a susceptible inbred line Huobai. With the aid of RFLP marker analyses, the Ht2 gene was mapped between the RFLP markers UMC89 and BNL2.369 on chromosome 8, with a genetic distance of 0.9 cM to BNL2.369. There was a linkage between SSR markers UMC1202, BNLG1152, UMC1149 and the Ht2 gene by SSR assay. Among the SSR markers, the genetic distance between UMC1149 and the Ht2 gene was 7.2 cM. By bulked segregant analysis 7 RAPD-amplified products which were probably linked to the Ht2 gene were selected after screening 450 RAPD primers and converted the single-copy ones into SCAR markers. Linkage analysis showed that the genetic distance between the SCAR marker SD-06633 and the Ht2 gene was 0.4 cM. From these results, a part of linkage map around the Ht2 gene was constructed.
基金supported by Beijing Outstanding Young Scientist Program(BJJWZYJH01201910019026)Chinese Postdoctoral Science Foundation(2019M660874,2021T140714).
文摘Droughts threaten crop yields worldwide.Compared to other major staple cereal crops,maize(Zea mays)is especially sensitive to drought,which can cause dramatic fluctuations in its yield potential.Natural maize populations contain many superior alleles that can enhance drought resistance through complex regulatory mechanisms.We recently de novo assembled the genome of a prominent drought-resistant maize germplasm,CIMBL55,and systematically dissected the genetic basis for its drought resistance on the genome,transcriptome,and epigenome levels.These analyses revealed 65 favorable drought resistance alleles in CIMBL55.Subsequently,we genetically verified the functions of the drought resistance genes ZmABF4,ZmNAC075,and ZmRtn16 and unraveled the function of ZmRtn16 on a molecular level.
