The origin and evolution of a two-component system of paralogous genes encoding the centromeric histone CENH3 in cereals

Table 1 The study species and their details

Species	Tribe*	Subfamily*	Genome size (1C), Mbp, pg	Ploidy, chromosome number
Streptochaeta angustifolia	Streptochaeteae	Anomochlooideae	N/A	2n = 2x = 22**
Panicum virgatum	Paniceae	Panicoideae	1370¹; 1.4	2n = 4x = 36
Zea mays	Andropogoneae	Panocoideae	3280; 2.7	2n = 2x = 20
Oryza sativa	Oryzeae	Oryzoideae	466; 0.5	2n = 2x = 24
Raddia distichophylla	Olyreae	Bambusoideae	600²; N/A	2n = 2x =22***
Nardus stricta	Nardeae	Pooideae	2050¹; 2.1	2n = 2x =26
Melica nutans	Meliceae	Pooideae	2450¹; 2.5	2n = 2x = 18
Stipa sibirica Stipa breviflora	Stipeae	Pooideae	~ 980¹; ~ 1.0	2n = 2x = 22 or 24
Brachypodium distachyon Brachypodium sylvaticum Brachypodium stacei	Brachypodieae	Pooideae	272; 0.32 529; 0.44 234; 0.28	2n = 2x = 10 2n = 2x = 18 2n = 2x = 20
Avena sativa	Poeae	Pooideae	12520¹; 12.8	2n = 6x = 42
Dactylis glomerata	Poeae	Pooideae	4420; 3.3	2n = 4x = 28**
Lolium perenne	Poeae	Pooideae	2770; 2.7	2n = 2x = 14
Hordeum brevisubulatum	Triticeae	Pooideae	8800¹; 9.0	2n = 4x = 28
Hordeum vulgare, ssp. spontaneum	Triticeae	Poideae	5180¹; 5.3	2n = 2x = 14
Hordeum vulgare	Triticeae	Pooideae	5180; 5.3	2n = 2x = 14
Secale cereale	Triticeae	Pooideae	8460; 8.7	2n = 2x = 14
Triticum urartu	Triticeae	Pooideae	5.75; 5.9	2n = 2x = 14
Aegilops speltoides	Triticeae	Pooideae	5680; 5.8	2n = 2x = 14
Aegilops tauschii	Triticeae	Pooideae	5050; 5.2	2n = 2x = 14
Triticum aestivum	Triticeae	Pooideae	17,280; 17.7	2n = 6x = 42

Note: Genome sizes are taken mainly from Leitch et al. [27]. Plant DNA C-values Database (release 7.1). https://cvalues.science.kew.org/
¹ Due to the absence of these values in Databases, they are calculated using the formula: 1 pg = 978 Mbp [28]
² Li et al. [29]
* tribal and subfamilial attribution to the classification system of Soreng et al. [22]; ** Pohl, Davidse [30]; *** Hunziker et al. [31]

ISSN: 1471-2229