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. 2005 Jan;95(1):219–227. doi: 10.1093/aob/mci015

Table 2.

DNA content and chromosome number of 21 Sorghum species

2C DNA content
Species
pg
SE
Mbp/1C1
Duncan grouping2
x = 5 genomesize (pg)3
Reportedchromosome no. 4 (2n)
Counted chromosome no. (2n)
Section
Sorghum amplum5 7·69 0·032 3768 C 1·28 10 30 Stiposorghum
S. angustum5 3·70 0·042 1813 H 1·85 10 10 Stiposorghum
S. bicolor5 (Tx623) 1·67 0·007 818 M 0·42 20 20 Eusorghum
S. bicolor5 (Pioneer 8695) 1·67 0·012 818 M 0·42 20 20 Eusorghum
S. brachypodum5 3·36 0·129 1646 I 1·68 10 10 Stiposorghum
S. bulbosum6 2·30 0·009 1127 K L 1·15 10 10 Stiposorghum
S. ecarinatum6 2·10 0·002 1029 L 1·05 10 10 Stiposorghum
S. exstans5 2·75 0·006 1348 J 1·38 10 10 Stiposorghum
S. halepense5 3·28 0·009 1607 I 0·41 40 40 Eusorghum
S. halepense7 3·27 0·020 1602 I 0·41 40 40 Eusorghum
S. interjectum7 7·29 0·048 3572 D 1·22 30 30 Stiposorghum
S. intrans6 2·28 0·023 1117 K L 1·14 10 10 Stiposorghum
S. laxiflorum6 2·49 0·038 1220 K J 0·31 40 40 Heterosorghum
S. leiocladum5 4·60 0·052 2254 F 2·30 20 10 Parasorghum
S. macrospermum6 2·07 0·017 1014 L 0·26 40 40 Chaetosorghum
S. matarankense6 2·51 0·029 1245 K J 1·26 10 10 Parasorghum
S. nitidum5 8·79 0·060 4307 B 2·20 10, 20 20 Parasorghum
S. plumosum5 (302489) 7·65 0·090 3748 C 1·28 10, 20, 30 30 Stiposorghum
S. plumosum7 (302635) 10·30 0·249 5047 A 1·29 10, 20, 30 40 Stiposorghum
S. propinquum5 1·52 0·012 745 MN 0·38 20 20 Eusorghum
S. purpureosericeum 4·18 0·022 2048 G 2·09 10 10 Parasorghum
S. stipoideum6 2·19 0·061 1073 L 1·10 10 10 Stiposorghum
S. timorense7 1·27 0·008 622 N 0·64 10, 20 10 Stiposorghum
S. versicolor (2x)7 3·25 0·023 1592 I 1·62 108 10 Parasorghum
S. versicolor (4x)5,9 6·67 0·086 3268 E 1·67 20 20 Parasorghum
1

1 pg = 980 mega base pairs (Mbp) (Cavalier-Smith, 1985).

2

Duncan grouping for 2C DNA content (pg). Means followed by the same letter are not significantly different (alpha = 0·05).

3

The genome size based on x = 5 was obtained using the following formula: genome size = [2C DNA content (pg)]/(2n chromosome no./5).

4

Reported chromosome numbers are from Lazarides et al. (1991) and Doggett (1988) unless referenced otherwise.

5

Calibration standard was Lupinus texensis; 2C DNA content is 2·44 pg.

6

Calibration standard was Arabidopsis thaliana ecotype Columbia; 2C DNA content = 314 Mbp or 0·32 pg (Bennett et al., 2002).

7

Calibration standard was Sorghum bicolor TX623; 2C DNA content = 1·67 pg.

8

Chromosome number reported by Yu and Liang (1992).

9

Colchicine-induced autotetraploid (Sun et al., 1994).