BcNAC056 Interacts with BcWRKY1 to Regulate Leaf Senescence in Pak Choi

Author:

Yuan Shuilin12,Wang Yuan12,Hu Die123,Zhu Weitong12,Xiao Dong12,Liu Tongkun12,Hou Xilin12ORCID,Li Ying12ORCID

Affiliation:

1. State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University , Nanjing, Jiangsu Province 210095, China

2. College of Horticulture, Nanjing Agricultural University , Nanjing, Jiangsu Province 210095, China

3. Guangdong Key Laboratory of Tea Plant Resources Innovation & Utilization, Tea Research Institute, Guangdong Academy of Agricultural Sciences , Guangzhou, Guangdong Province 510640, China

Abstract

Abstract Senescence is the final stage of leaf development. For leafy vegetables such as pak choi, leaf senescence is adverse to yield due to the harvest period shortening. However, the regulatory mechanisms of leaf senescence are largely unknown in leafy vegetables. Here, we isolated and characterized a NAC gene, BcNAC056, in pak choi [Brassica campestris (syn. Brassica rapa) ssp. chinensis cv. 49caixin]. BcNAC056-GFP was located in the nucleus at the subcellular level, and BcNAC056 was responsive to leaf senescence and different hormones at the transcriptional level. Heterologous overexpression of BcNAC056 in Arabidopsis promoted leaf senescence, accompanied by the increased expression of senescence-associated genes (SAGs), whereas virus-induced gene silencing–based silencing in pak choi delayed leaf senescence. The following transcriptome analysis showed that heterologous overexpression of BcNAC056 enhanced some AtSAG transcripts in Arabidopsis. Electrophoretic mobility shift assay (EMSA) and dual-luciferase (LUC) reporter assay revealed that BcNAC056 activated SAG12 by directly binding to the promoter. In addition, with the LUC reporter and transient overexpression assays, we proposed that BcNAC056–BcWRKY1 interaction promoted the activation of BcSAG12. Taken together, our findings revealed a new regulatory mechanism of leaf senescence in pak choi.

Funder

National Vegetable Industry Technology System

Jiangsu Agricultural Science and Technology Innovation Fund

the Priority Academic Program Development of Jiangsu Higher Education Institutions

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Cell Biology,Plant Science,Physiology,General Medicine

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