文献类型： 外文期刊
作者： Liu, Zhe 1 ; Sun, Zhenzhen 1 ; Zeng, Chaozhen 1 ; Dong, Xujie 1 ; Li, Mei 2 ; Liu, Zhixiang 1 ; Yan, Mingli 2 ;
作者机构： 1.Cent South Univ Forestry & Technol, Hunan Prov Key Lab Forestry Biotechnol, Coll Life Sci & Technol, Changsha 410004, Peoples R China
2.Hunan Acad Agr Sci, Crop Res Inst, Changsha 410125, Peoples R China
3.Cent South Univ Forestry & Technol, Int Cooperat Base Sci & Technol Innovat Fores, Changsha 410004, Peoples R China
4.Hunan Agr Univ, Hunan Prov Key Lab Crop Germplasm Innovat & Ut, Changsha 410128, Peoples R China
5.Hunan Univ Sci & Technol, Hunan Key Lab Econ Crops Genet Improvement & Inte, Xiangtan 411201, Peoples R China
关键词： MiRNAs; Systemic acquired resistance (SAR); Defense-related genes; Cadmium
期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.26； 五年影响因子：5.761 ）
ISSN： 1471-2229
年卷期： 2022 年 22 卷 1 期
页码：
收录情况： SCI
摘要： Background The elemental defense hypothesis states a new defensive strategy that hyperaccumulators defense against herbivores or pathogens attacks by accumulating heavy metals. Brassica juncea has an excellent ability of cadmium (Cd) accumulation. However, the elemental defense effect and its regulation mechanism in B. juncea remain unclear. Results In this study, we profiled the elemental defense effect and the molecular regulatory mechanism in Cd-accumulated B. juncea after Alternaria brassicicola infection. B. juncea treated with 180 mg Kg(- 1) DW CdCl2 2.5H(2)O exhibited obvious elemental defense effect after 72 h of infection with A. brassicicola. The expression of some defense-related genes including BjNPR1, BjPR12, BjPR2, and stress-related miRNAs (miR156, miR397, miR398a, miR398b/c, miR408, miR395a, miR395b, miR396a, and miR396b) were remarkably elevated during elemental defense in B. juncea. Conclusions The results indicate that Cd-accumulated B. juncea may defend against pathogens by coordinating salicylic acid (SA) and jasmonic acid (JA) mediated systemic acquired resistance (SAR) and elemental defense in a synergistic joint effect. Furthermore, the expression of miRNAs related to heavy metal stress response and disease resistance may regulate the balance between pathogen defense and heavy metal stress-responsive in B. juncea. The findings provide experimental evidence for the elemental defense hypothesis in plants from the perspectives of phytohormones, defense-related genes, and miRNAs.
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