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Published on March 16, 2007; 10.1104/pp.106.093575

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Received November 27, 2006
Accepted March 13, 2007

Arabidopsis Nucleolin Affects Plant Development and Patterning

Jalean Joyanne Petricka and Timothy Mark Nelson *

Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06520-8104, USA

* Corresponding author; email: timothy.nelson{at}yale.edu.

Nucleolin is a major nucleolar protein implicated in many aspects of ribosomal biogenesis, including early events such as processing of the large 35S pre-ribosomal RNA. We found that that the Arabidopsis parallel1 (parl1) mutant, originally identified by its aberrant leaf venation, corresponds to the Arabidopsis nucleolin gene. parl1 mutants display parallel leaf venation, aberrant localization of the provascular marker Athb8:GUS and the auxin-sensitive reporter DR5:GUS, and auxin-dependent growth defects. PARL1 is highly similar to the Saccharomyces cerevisiae nucleolin NUCLEAR SIGNAL RECOGNITION 1 (NSR1) multifunctional protein; the Arabidopsis PARL1 gene can rescue growth defects of yeast nsr1 null mutants. This suggests that PARL1 protein may have roles similar to those of the yeast nucleolin in nuclear signal recognition, ribosomal processing and ribosomal subunit accumulation. Based on the range of auxin-related defects in parl1 mutants, we propose that auxin-dependent organ growth and patterning is highly sensitive to the efficiency of nucleolin-dependent ribosomal processing.




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