The Arabidopsis thaliana NGATHA transcription factors negatively regulate cell proliferation of lateral organs

Byung Ha Lee, So Hyun Kwon, Sang Joo Lee, Soon Ki Park, Jong Tae Song, Sangman Lee, Myeong Min Lee, Yong sic Hwang, Jeong Hoe Kim

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The cell proliferation process of aerial lateral organs, such as leaves and flowers, is coordinated by complex genetic networks that, in general, converge on the cell cycle. The Arabidopsis thaliana NGATHA (AtNGA) family comprises four members that belong to the B3-type transcription factor superfamily, and has been suggested to be involved in growth and development of aerial lateral organs, although its role in the cell proliferation and expansion processes remains to be resolved in more detail. In order to clarify the role of AtNGAs in lateral organ growth, we took a systematic approach using both the loss- and gain-of-functional mutants of all four members. Our results showed that overexpressors of AtNGA1 to AtNGA4 developed small, narrow lateral organs, whereas the nga1 nga2 nga3 nga4 quadruple mutant produced large, wide lateral organs. We found that cell numbers of the lateral organs were significantly affected: a decrease in overexpressors and, inversely, an increase in the quadruple mutant. Kinematic analyses on leaf growth revealed that, compared with the wild type, the overexpressors displayed a lower activity of cell proliferation and yet the mutant a higher activity. Changes in expression of cell cycle-regulating genes were well in accordance with the cell proliferation activities, establishing that the AtNGA transcription factors act as bona fide negative regulators of the cell proliferation of aerial lateral organs.

Original languageEnglish
Pages (from-to)529-538
Number of pages10
JournalPlant Molecular Biology
Issue number4-5
Publication statusPublished - 2015 Oct 3

Bibliographical note

Publisher Copyright:
© 2015, Springer Science+Business Media Dordrecht.

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Genetics
  • Plant Science


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