江苏省农业科学院机构知识库

Identification and validation of a major QTL conferring crown rot resistance in hexaploid wheat

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文献类型：外文期刊

作者： Ma, J. ¹ ; Li, H. B. ¹ ; Zhang, C. Y. ¹ ; Yang, X. M. ¹ ; Liu, Y. X. ¹ ; Yan, G. J. ² ; Liu, C. J. ¹ ;

作者机构： 1.CSIRO Plant Ind, St Lucia, Qld 4067, Australia

2.Univ Western Australia, Sch Plant Biol, Perth, WA 6009, Australia

3.Jiangsu Acad Agr Sci, Inst Biotechnol, Nanjing, Peoples R China

4.Sichuan Agr Univ, Minist Educ, Key Lab Crop Genet Resource & Improvement, Yaan 625014, Sichuan, Peoples R China

关键词： genotype;disease severity;phenotypic variance;chromosomal location;genetic control;disease resistance;quantitative trait loci

期刊名称：THEORETICAL AND APPLIED GENETICS （影响因子：5.699；五年影响因子：5.565 ）

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年卷期：

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收录情况： SCI

摘要： Crown rot (CR), caused by various Fusarium species, is a chronic wheat disease in Australia. As part of our objective of improving the efficiency of breeding CR resistant wheat varieties, we have been searching for novel sources of resistance. This paper reports on the genetic control of one of these newly identified resistant genotypes, CSCR6'. A population derived from a cross between CSCR6 and an Australian variety Lang' was analyzed using two Fusarium isolates belonging to two different species, one Fusarium pseudograminearum and the other Fusarium graminearum. The two isolates detected QTL with the same chromosomal locations and comparable magnitudes, indicating that CR resistance is not species-specific. The resistant allele of one of the QTL was derived from CSCR6'. This QTL, designated as Qcrs.cpi-3B, was located on the long arm of chromosome 3B and explains up to 48.8% of the phenotypic variance based on interval mapping analysis. Another QTL, with resistant allele from the variety Lang', was located on chromosome 4B. This QTL explained up to 22.8% of the phenotypic variance. A strong interaction between Qcsr.cpi-3B and Qcsr.cpi-4B was detected, reducing the maximum effect of Qcrs.cpi-3B to 43.1%. The effects of Qcrs.cpi-3B were further validated in four additional populations and the presence of this single QTL reduced CR severity by up to 42.1%. The fact that significant effects of Qcrs.cpi-3B were detected across all trials with different genetic backgrounds and with the use of isolates belonging to two different Fusarium species make it an ideal target for breeding programs as well as for further characterization of the gene(s) involved in its resistance.

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