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Table 1 Compilation of the number of nuclear encoded, chloroplast directed transgenomic suppressor functions (PPR proteins, sigma factors and phage type RNA polymerases) and of plastid genes encoded among plants and unicellular algae.

From: Complex chloroplast RNA metabolism: just debugging the genetic programme?

  A. thaliana P. trichocarpa V. vinifera O. sativa P. patens C. reinhardtii O. tauri O. lucimarinus T. pseudonana P. tricornutum C. merolae
PPR proteins 482 641 610 491 110 13 19 22 46 50 8
Sigma 70 factors 6 9 6 6 6 1 1 1 4 5 4
Plastid genes 85 99 84 64 85 69 43 n.a. 141 132 207
PPR/plastid gene* 0.90 1.04 1.16 1.23 0.21 0.03 0.07 n.a. 0.05 0.06 0.006
Phage-type RNA polymerases 3 >3 3 2 3 1 1 1 1 1 1
  1. *The PPR protein-plastid gene relations were determined under the assumption that in all taxa 16% of the PPR proteins are plastid proteins (as shown for A. thaliana in [35]).
  2. n.a. = not applicable.