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The  Golden2-like  (GLK) transcription factors play important roles in regulating chloroplast growth, development, and senescence in plants. In this study, a total of 89  NtGLK  genes ( NtGLK1–NtGLK89 ) were identified in the tobacco genome and were classified into 10 subfamilies with variable numbers of exons and similar structural organizations based on the gene structure and protein motif analyses. Twelve segmental duplication pairs of  NtGLK  genes were identified in the genome. These  NtGLK  genes contain two conserved helix regions related to the HLH structure, and the sequences of the first helix region are less conserved than that of the second helix motif.  Cis -regulatory elements of the  NtGLK  promoters were widely involved in light responsiveness, hormone treatment, and physiological stress. Moreover, a total of 206  GLK  genes from tomato, tobacco, maize, rice, and  Arabidopsis  were retrieved and clustered into eight subgroups. Our gene expression analysis indicated that  NtGLK  genes showed differential expression patterns in tobacco leaves at five senescence stages. The expression levels of six  NtGLK  genes in group C were reduced, coinciding precisely with the increment of the degree of senescence, which might be associated with the function of leaf senescence of tobacco. Our results have revealed valuable information for further functional characterization of the  GLK  gene family in tobacco.

Genome-Wide Analysis of the G2-Like Transcription Factor Genes and Their Expression in Different Senescence Stages of Tobacco (Nicotiana tabacum L.)