Electronic Journal of Biotechnology ISSN: 0717-3458
  © 2007 by Universidad Católica de Valparaíso -- Chile
Vol. 9 No. 3, Issue of April 15, 2006
 


Table 1. Cytogenetic study of Zea mays, Tripsacum dactyloides, Z. mays x T. dactyloides F1 hybrid plants (ZmT)and their progeny (pZmT): chromosome number, averages of uni-, bi-, tri and tetravalents per cell (PMC) and chiasmata cell-1.


Genotype

2n

Meiotic configurations

Chiasmata cell-1

Nº of PMC*

I

II

III

IV

Zea mays

40

0.04

3.15

0.04

8.27

33.75

143

T. dactyloides

72

0.01

20.65

0.01

6.80

58.50

153

ZmT

56

0.27

25.28

0

1.11

40.63

129

ZmT

56

0.62

25.16

0

1.30

39.07

111

ZmT

56

0.63

23.70

0

1.94

44.50

108

ZmT

56

0.70

26.58

0

0.41

42.80

105

pZmT

22

0.04

10.70

0

0.14

30.52

96

pZmT

22

0.17

10.63

0

0.03

20.13

105

pZmT

22

0.07

10.60

0

0.18

20.09

118

pZmT

24

0.06

11.35

0

0.31

22.70

146

pZmT

26

0.04

10.20

0

1.20

24.00

84

pZmT

26

1.00

10.00

0

0.92

21.00

89

pZmT

26

0.08

12.35

0

0.31

24.26

105

pZmT

26

0.06

12.06

0

0.45

22.15

121

pZmT

26

0.16

12.43

0

0.24

22.78

92

pZmT

28

0.05

10.89

0

1.54

26.19

104

pZmT

28

0.03

11.20

0

1.39

25.32

78

pZmT

30

0.04

13.76

0

0.58

24.22

100


* PMC: Pollen mother cells.

Supported by UNESCO / MIRCEN network