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The wheat durable, multipathogen resistance gene Lr34 confers partial blast resistance in rice

文献类型： 外文期刊

作者： Krattinger, Simon G. 1 ; Sucher, Justine 1 ; Selter, Liselotte L. 1 ; Chauhan, Harsh 1 ; Zhou, Bo 2 ; Tang, Mingzhi 3 ;

作者机构： 1.Univ Zurich, Inst Plant Biol, Zollikerstr 107, CH-8008 Zurich, Switzerland

2.Int Rice Res Inst, Div Plant Breeding Genet & Biotechnol, Los Banos, Philippines

3.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou, Zhejiang, Peoples R China

4.CSIRO, Agr Flagship, Canberra, ACT, Australia

5.CIRAD, UMR AGAP, Montpellier, France

6.Rhein Westfal TH Aachen, Aachen, Germany

7.Indian Inst Technol, Roorkee, Uttar Pradesh, India

关键词： Lr34;Yr18;Sr57;Pm38;durable disease resistance;rice blast;fungal pathogen;wheat;rice

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： The wheat gene Lr34 confers durable and partial field resistance against the obligate biotrophic, pathogenic rust fungi and powdery mildew in adult wheat plants. The resistant Lr34 allele evolved after wheat domestication through two gain-of-function mutations in an ATP-binding cassette transporter gene. An Lr34-like fungal disease resistance with a similar broad-spectrum specificity and durability has not been described in other cereals. Here, we transformed the resistant Lr34 allele into the japonica rice cultivar Nipponbare. Transgenic rice plants expressing Lr34 showed increased resistance against multiple isolates of the hemibiotrophic pathogen Magnaportheoryzae, the causal agent of rice blast disease. Host cell invasion during the biotrophic growth phase of rice blast was delayed in Lr34-expressing rice plants, resulting in smaller necrotic lesions on leaves. Lines with Lr34 also developed a typical, senescence-based leaf tip necrosis (LTN) phenotype. Development of LTN during early seedling growth had a negative impact on formation of axillary shoots and spikelets in some transgenic lines. One transgenic line developed LTN only at adult plant stage which was correlated with lower Lr34 expression levels at seedling stage. This line showed normal tiller formation and more importantly, disease resistance in this particular line was not compromised. Interestingly, Lr34 in rice is effective against a hemibiotrophic pathogen with a lifestyle and infection strategy that is different from obligate biotrophic rusts and mildew fungi. Lr34 might therefore be used as a source in rice breeding to improve broad-spectrum disease resistance against the most devastating fungal disease of rice.

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