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Zhang Y, Xu K, Pei D, Yu D, Zhang J, Li X, Chen G, Yang H, Zhou W, Li C. ShORR-1, a Novel Tomato Gene, Confers Enhanced Host Resistance to Oidium neolycopersici. FRONTIERS IN PLANT SCIENCE 2019; 10:1400. [PMID: 31787994 PMCID: PMC6854008 DOI: 10.3389/fpls.2019.01400] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 10/10/2019] [Indexed: 05/17/2023]
Abstract
A previous complementary cDNA-amplified fragment length polymorphism (cDNA-AFLP) analysis examined responses to the powdery mildew pathogen Oidium neolycopersici (On) of the resistant cultivar Solanum habrochiates G1.1560, carrying the Ol-1 resistance gene, and susceptible cultivar S. lycopersicum Moneymaker (MM). Among other findings, a differentially expressed transcript-derived fragment (DE-TDF) (M14E72-213) was upregulated in near isogenic line (NIL)-Ol-1, but absent in MM. This DE-TDF showed high homology to a gene of unknown function, which we named ShORR-1 (Solanum habrochaites Oidium Resistance Required-1). However, MM homolog of ShORR-1 (named ShORR-1-M) was still found with 95.26% nucleic acid sequence similarity to ShORR-1 from G1.1560 (named ShORR-1-G); this was because the cut sites of restriction enzymes in the previous complementary cDNA-AFLP analysis was absent in ShORR-1-M and differs at 13 amino acids from ShORR-1-G. Transient expression in onion epidermal cells showed that ShORR-1 is a membrane-localized protein. Virus-induced gene silencing (VIGS) of ShORR-1-G in G1.1560 plants increased susceptibility to On. Furthermore, overexpressing of ShORR-1-G conferred MM with resistance to On, involving extensive hydrogen peroxide accumulation and formation of abnormal haustoria. Knockdown of ShORR-1-M in MM did not affect its susceptibility to On, while overexpressing of ShORR-1-M enhanced MM's susceptibility to On. We also found that changes in transcript levels of six well-known hormone signaling and defense-related genes are involved in ShORR-1-G-mediated resistance to On. The results indicate that ShORR-1-M and ShORR-1-G have antagonistic effects in tomato responses to On, and that ShORR-1 is essential for Ol-1-mediated resistance in tomato.
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Affiliation(s)
- Yi Zhang
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Kedong Xu
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Dongli Pei
- Department of Life Science, Shangqiu Normal University, Shangqiu, China
| | - Deshui Yu
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Ju Zhang
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Xiaoli Li
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Guo Chen
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Hui Yang
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Wenjie Zhou
- Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, China
- Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, China
| | - Chengwei Li
- Henan Engineering Research Center of Grain Crop Genome Editing, Henan Institute of Science and Technology, Xinxiang, China
- *Correspondence: Chengwei Li,
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