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KMID : 0368420220650030231
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Journal of Plant Biology
2022 Volume.65 No. 3 p.231 ~ p.239
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Universal Stress Protein (USP) Enhances Plant Growth and Development by Promoting Cell Expansion
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Lee Eun-Seon
Phan Kieu Anh Thi
Jun Sang-Eun
Park Joung-Hun
Paeng Seol-Ki
Chae Ho-Byoung
Wi Seong-Dong
Bae Su-Bin
Kang Kee-Ryeon
Kim Gyung-Tae
Lee Sang-Yeol
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Abstract
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Plants are exposed to various environmental stimuli, including abiotic and biotic stresses, during their life cycle. In Arabidopsis thaliana, the Universal Stress Protein (AtUSP) acts as a protein chaperone and RNA chaperone to protect plants from heat shock and cold shock, respectively. This study aimed to explore the role of AtUSP in plant growth and development. We conducted morphological analyses of wild-type (WT; Col-0), AtUSP overexpression (AtUSPOE), and atusp knockout mutant plants during their vegetative growth, and measured the total leaf number, leaf size, and root length. Compared with the WT, AtUSPOE plants displayed enhanced growth, whereas atusp plants displayed reduced growth of all examined organs. To investigate whether these growth phenotypes were caused by changes in cell expansion and proliferation, we analyzed the mature leaves of all genotypes at the cellular level. The enlarged leaves of AtUSPOE plants showed an increase in cell size, but not in cell number, indicating that AtUSP promotes cell expansion. Moreover, expression analysis of cell growth-related genes revealed that AtUSP is involved in cell expansion rather than cell proliferation. These findings suggest that AtUSP acts as a positive regulator of cell expansion, and provide novel insights into its role in plant growth and development.
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KEYWORD
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Arabidopsis thaliana, AtUSP, Growth and development, Cell expansion
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