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 pg = 980 mega base pairs (Mbp) (Cavalier-Smith, 1985).
Duncan grouping for 2C DNA content (pg). Means followed by the same letter are not significantly different (alpha = 0·05).
The genome size based on x = 5 was obtained using the following formula: genome size = [2C DNA content (pg)]/(2n chromosome no./5).
Reported chromosome numbers are from Lazarides et al. (1991) and Doggett (1988) unless referenced otherwise.
Calibration standard was Lupinus texensis; 2C DNA content is 2·44 pg.
Calibration standard was Arabidopsis thaliana ecotype Columbia; 2C DNA content = 314 Mbp or 0·32 pg (Bennett et al., 2002).
Calibration standard was Sorghum bicolor TX623; 2C DNA content = 1·67 pg.
Chromosome number reported by Yu and Liang (1992).
Colchicine-induced autotetraploid (Sun et al., 1994).