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AgNAC1, a celery transcription factor, related to regulation on lignin biosynthesis and salt tolerance

文献类型： 外文期刊

作者： Duan, Ao-Qi 1 ; Tao, Jian-Ping 1 ; Jia, Li-Li 1 ; Tan, Guo-Fei 1 ; Liu, Jie-Xia 1 ; Li, Tong 1 ; Chen, Long-Zheng 3 ; Su, 1 ;

作者机构： 1.Nanjing Agr Univ, Key Lab Biol & Germplasm Enhancement Hort Crops E, State Key Lab Crop Genet & Germplasm Enhancement, Minist Agr & Rural Affairs,Coll Hort, Nanjing 210095, Peoples R China

2.Guizhou Acad Agr Sci, Inst Hort, Guiyang 55006, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Vegetable Crops, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210095, Peoples R China

关键词： AgNAC1; Transcription factor; Salt stress; Lignin; Overexpression; Apium graveolens L

期刊名称：GENOMICS （ 2020影响因子：5.736； 五年影响因子：4.939 ）

ISSN： 0888-7543

年卷期： 2020 年 112 卷 6 期

页码：

收录情况： SCI

摘要： The NAC transcription factor participates in various biotic and abiotic stress responses and plays a critical role in plant development. Lignin is a water-insoluble dietary fiber, but it is second only to cellulose in abundance. Celery is the main source of dietary fiber, but its quality and production are limited by various abiotic stresses. Here, AgNAC1 containing the NAM domain was identified from celery. AgNAC1 was found to be a nuclear protein. Transgenic Arabidopsis thaliana plants hosting AgNAC1 have longer root lengths and stomatal axis lengths than the wide type (WT). The evidence from lignin determination and expression levels of lignin-related genes indicated that AgNAC1 plays a vital role in lignin biosynthesis. Furthermore, the results of the physiological characterization and the drought and salt treatments indicate that AgNAC1-overexpressing plants are significantly resistive to salt stress. Under drought and salt treatments, the AgNAC1 transgenic Arabidopsis thaliana plants presented increased superoxide dismutase (SOD) and peroxidase (POD) activities and decreased malondialdehyde (MDA) content and size of stomatal apertures relatively to the WT plants. The AgNAC1 served as a positive regulator in inducing the expression of stress-responsive genes. Overall, the overexpressing AgNAC1 enhanced the plants' resistance to salt stress and played a regulatory role in lignin accumulation.

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