Table 2.

The number of 18S–25S and 5S rDNA sites in the diploid genome of Pinus

Species	18S–25S rDNA	5S rDNA	Reference
Subgenus Strobus
Pinus bungeana Zucc.	8 strong	4 strong	Present study
Pinus koraiensis Sieb. et Zucc.	18 strong	8 strong	Present study
Pinus armandii Franch.	20 strong	6 strong	Present study
Pinus wallichiana Jackson	20 strong	4 strong	Present study
Pinus strobus L.	18 strong	4 strong	Present study
Pinus strobus L.	10–14	–	Nkongolo et al. (2004)
Subgenus Pinus
P. banksiana Lamb.	10–14	–	Nkongolo et al. (2004)
Pinus elliotii Englem.	16 strong	2 strong, 4 weak	Doudrick et al. (1995)
Pinus radiata D. Don	12 strong, 8 weak	2 strong, 2 weak	Jacobs et al. (2000)
Pinus sylvestris L.	>16, 14 strong	2 strong, 2 weak	Hizume et al. (2002); Karvonen et al. (1993); Lubaretz et al. (1996)
Pinus densiflora Sieb. et Zucc.	14 strong	2 strong, 2 weak	Hizume et al. (1992, 2002)
Pinus thunbergii Parl.	10 strong, 2 weak	2 strong, 2 weak	Hizume et al. (1992, 2002)
Pinus nigra Arnold	16	2 strong, 2 weak	Hizume et al. (2002)
Pinus taeda L.	12 strong, 8 weak	2 strong, 2 weak	Jacobs et al. (2000)
Pinus tabuliformis Carr.	14 strong, 10 weak	2 strong, 2 weak	Liu et al. (2003)
Pinus densata Mast.	10 strong, 8 weak	2 strong, 1 weak	Liu et al. (2003)
Pinus yunnanensis Franch.	16 strong, 4 weak	2 strong, 2 weak	Liu et al. (2003)
Pinus massoniana Lamb.	20 strong	2 strong	Liu et al. (2003)
Pinus merkusii Jungh. et de Vriese	12 strong, 4 weak	2 strong, 2 weak	Liu et al. (2003)