Abstract:
:During leaf organogenesis, a critical step for normal leaf primordium initiation is the repression of the class 1 KNOTTED1-like homeobox (KNOX) genes. After leaf primordia are formed, they must establish polarity for normal leaf morphogenesis. Recent studies have led to the identification of a number of genes that participate in the class 1 KNOX gene repression and/or the leaf polarity establishment. ASTMMETRIC LEAVES1 and 2 (AS1 and AS2) are two of these genes, which are critical for both of these two processes. As a first step towards understanding the molecular genetic basis of the AS1-AS2 action, we determined the subcellular localizations of the two proteins in both tobacco BY2 cells and Arabidopsis plants, by fusing them to yellow/cyan fluorescent protein (YFP/CFP). Our data showed that AS1 and AS2 alone were predominantly localized in the nucleolus and the nucleoplasm, respectively. The presence of both AS1 and AS2 proteins in the same interphase cell demonstrated their co-localization in both nucleolus and nucleoplasm. In addition, AS1 alone was able to associate with the condensed chromosome in the metaphase cell. Our data suggest that AS1, AS2 and the AS1-AS2 protein complex may have distinct functions, which are all required for normal plant development.
journal_name
J Integr Plant Bioljournal_title
Journal of integrative plant biologyauthors
Zhu Y,Li Z,Xu B,Li H,Wang L,Dong A,Huang Hdoi
10.1111/j.1744-7909.2008.00693.xsubject
Has Abstractpub_date
2008-07-01 00:00:00pages
897-905issue
7eissn
1672-9072issn
1744-7909pii
JIPB693journal_volume
50pub_type
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