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《Scientia Agricultura Sinica》 2010-04
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Study on Inheritance and Molecular Makers of Sorghum Resistance to Head Smut Physiological Race 3

ZOU Jian-qiu1,LI Yue-ying2,ZHU Kai1,WANG Yan-qiu1 (1Liaoning Academy of Agricultural Sciences,Shenyang 110161;2College of Chemistry and Life Science,Shenyang Normal University,Shenyang 110034)  
【Objective】 The objectives of the research are screening molecular markers of sorghum resistance gene to head smut physiological race 3 by using SSR.Once the molecular markers are found,it would become true to select resistant lines in the indoor laboratory,and the evaluation in the field may be neglected.【Method】 Bulked segregation analysis (BSA) was applied in the study.Two segregation population,restorer line population (R population) 2381R/Aisi and maintainer line population (B population) Tx622B/7050B,were used in the research.【Result】 The resistance to sorghum head smut physiological race 3 is a qualitative trait inheritance.It has a dominant genetic effect.F1 would be resistant,too,provided one of the parents is resistant.It is the first time getting two stable SSR markers which can be used as molecular markers of sorghum resistance genes to head smut physiological race 3,they are Xtxp13 and Xtxp145.Xtxp13 located in linkage group B,and Xtxp145 located in linkage group I.The recombination percentage between marker and resistant gene are 9.6% and 10.4%,respectively.The genetic distances to resistant gene are 9.6 cM and 10.4 cM,respectively.【Conclusion】 The resistance to sorghum head smut physiological race 3 may be controlled by two mutual independent nonallelic genes,and there is interaction between them.It is found that molecular markers are easier to find in B population than R population during the screening of SSR markers.It may show the different resistance mechanism between restorer line and maintainer line.
【Fund】: 国家“863”计划课题(2004AA241230);; 国家“十一五”科技支撑计划课题(2006BAD02B03);; 高粱产业技术体系建设(nycytx-12);; 辽宁省教育厅重点实验室资助项目(20060806);; 辽宁省自然科学基金项目(20022094 20061045);; 沈阳市科技局国际合作项目(1091241-6-00)
【CateGory Index】: S435.14
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