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Floral transition in maize infected with Sporisorium reilianum disrupts compatibility with this biotrophic fungal pathogen

文献类型： 外文期刊

作者： Zhang, Shaopeng 1 ; Gardiner, Jack 2 ; Xiao, Yannong 1 ; Zhao, Jiuran 3 ; Wang, Fengge 3 ; Zheng, Yonglian 1 ;

作者机构： 1.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China

2.Univ Arizona, Inst BIO5, Tucson, AZ 85721 USA

3.Beijing Acad Agr & Forestry Sci, Maize Res Ctr, Beijing 100097, Peoples R China

关键词： Disease resistance;Head smut;Host-pathogen interaction;Microarray;Zea mays

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

ISSN：

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收录情况： SCI

摘要： Sporisorium reilianum f. sp. zeae is an important biotrophic pathogen that causes head smut disease in maize. Head smut is not obvious until the tassels and ears emerge. S. reilianum has a very long life cycle that spans almost the entire developmental program of maize after the pathogen successfully invades the root. The aim of this study was to understand at a molecular level how this pathogen interacts with the host during its long life cycle, and how this interaction differs between susceptible and resistant varieties of maize after hyphal invasion. We investigated transcriptional changes in the resistant maize line Mo17 at four developmental stages using a maize 70mer-oligonucleotide microarray. We found that there was a lengthy compatible relationship between the pathogen and host until the early eighth-leaf stage. The resistance in Mo17 relied on the assignment of auxin and regulation of flavonoids in the early floral primordium during the early floral transition stage. We propose a model describing the putative mechanism of head smut resistance in Mo17 during floral transition. In the model, the synergistic regulations among auxin, flavonoids, and hyphal growth play a key role in maintaining compatibility with S. reilianum in the resistant maize line.

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