Table I. Functional classification of UP, ovules, and pollen-expressed transcripts

Functional categories are based on criteria of the Munich Information Center for Protein Sequences Arabidopsis database. Data refer to frequency (%) of annotated genes assigned to each functional category. Overrepresented categories are highlighted in boldface, and the total number of genes is indicated in parentheses. Asterisks indicate significant categories at P < 0.05.

Functional CategoryEnriched or Preferentially ExpressedEnriched
ATH1 (22,325)Ovules (46)Pollen (420)UP (317)Ovules (1,245)Pollen (964)
Metabolism20.615.222.919.616.927.0*
Cell wall1.78.7*4.8*4.7*1.43.0
Cytoskeleton0.60.01.4*01.12.5*
Energy pathways1.90.00.70.71.01.1
Stress and defense5.70.04.38.8*2.95.2
Signal transduction5.206.9*5.45.69.1*
Cellular transport10.00.012.9*9.17.912.3
Interaction with cellular environment6.10.03.311.4*5.96.6
Cell cycle and DNA processing5.96.52.66.010.0*3.8
Transcription9.74.35.213.2*16.1*5.3
Protein fate12.710.915.0*12.313.717.8*
Development3.410.9*4.06.3*4.63.8
Cell fate1.64.3*1.02.21.82.0
Protein regulation2.54.33.802.22.45.6*
Protein synthesis2.70.00.003.90.9
Unclassified25.650.0*25.520.823.423.3