Overexpression of the salicylic acid binding protein 2 (SABP2) from tobacco enhances tolerance against Huanglongbing in transgenic citrus
文献类型： 外文期刊
作者： Soares, Juliana M. 1 ; Weber, Kyle C. 1 ; Qiu, Wenming 2 ; Mahmoud, Lamiaa M. 1 ; Grosser, Jude W. 1 ; Dutt, Manjul 1 ;
作者机构： 1.Univ Florida, Citrus Res & Educ Ctr, Lake Alfred, FL 33850 USA
2.Hubei Acad Agr Sci, Inst Fruit & Tea, Wuhan 430064, Peoples R China
3.Mansoura Univ, Fac Agr, Pomol Dept, Mansoura 35516, Egypt
关键词： Citrus sinensis; Huanglongbing; Transgenic; Salicylic acid; Methyl salicylate; Systemic acquired resistance
期刊名称：PLANT CELL REPORTS （ 影响因子：4.964； 五年影响因子：5.004 ）
ISSN： 0721-7714
年卷期： 2022 年 41 卷 12 期
页码：
收录情况： SCI
摘要： Key message Overexpression of the salicylic acid binding protein 2 (SABP2) gene from Tobacco results in enhanced tolerance to Huanglongbing (HLB; citrus greening disease) in transgenic sweet oranges. Huanglongbing (HLB), the most destructive citrus disease, is caused by Candidatus Liberibacter asiaticus (CaLas). Currently, no cure for this disease exists, and all commercially planted cultivars are highly susceptible. Salicylic Acid Binding Protein 2 (SABP2) is a well-characterized protein essential for establishing systemic acquired resistance (SAR) in tobacco. The constitutive over expression of SABP2 from tobacco (NtSABP2) in 'Hamlin' sweet orange resulted in the production of several transgenic lines with variable transcript levels. Transient expression of the NtSABP2-EGFP fusion protein in Nicotianabenthamiana plants demonstrated that NtSABP2 was cytosolic in its subcellular localization. In a long-term field study, we identified a SABP2 transgenic line with significantly reduced HLB symptoms that maintained a consistently low CaLas titer. Transcriptome analysis of this selected transgenic line demonstrated upregulation of several genes related to plant defense and SAR pathways. Genes, such as NPR family genes and those coding for monooxygenases and lipoxygenases, were upregulated in the 35S-NtSABP2 overexpressing line and might be candidates for incorporation into our citrus improvement program.
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