New Zealand Journal of Agricultural Research abstracts
Meiotic behaviour in reciprocal tetraploid hybrids between
perennial and Italian ryegrasses
Bilal Deniz
Department of Agronomy
Agricultural Faculty
Atatürk University
25240 Erzurum, Turkey
Unsal Dogru
Department of Animal Science
Agricultural Faculty
Atatürk University
25240 Erzurum, Turkey
Abstract Chromosome associations and
chiasma frequencies at
first metaphase (MI) were studied in allotetraploid reciprocal hybrids
between perennial ryegrass (Lolium perenne, Lp) and Italian
ryegrass (L. multiflorum, Lm), and parent autotetraploid
perennial ryegrass. Preferential chromosome pairings were
assessed in Lp × Lm and Lm × Lp hybrids. The reciprocal
hybrids were found to have significantly higher frequencies of bivalent
pairing and lower frequencies of quadrivalent pairing and chiasmata.
The mean frequencies of total bivalents at MI were 6.820, 9.885 and
10.040 and total quadrivalent frequencies were 3.320, 1.775 and 1.760
in the autotetraploid parent and the Lp × Lm and Lm × Lp
hybrids, respectively. The frequencies of chiasmata were 25.075, 23.455
and 23.315 in the parent and the Lp × Lm and Lm × Lp
hybrids, respectively. The frequencies of preferential chromosome
pairing in the Lp × Lm and Lm × Lp hybrids were 42.69 and
44.85%, respectively and the results indicate a significant degree of
preferential bivalent association in the hybrids. An inverse
relationship was found between the frequency of total bivalent and
quadrivalent associations in the parent and the Lp × Lm and Lm
× Lp hybrids. These reciprocal hybrids are potentially important
breeding materials for developing new hybrid cultivars.
Keywords interspecific hybrids;
preferential chromosome
association; synthetic allopolyploids
A06048; Online publication date 13 March 2008; Received 27 July
2006; accepted 28 September 2007
New Zealand Journal of Agricultural Research, 2008, Vol. 51:
33–37
0028–8233/08/5101–0033 © The Royal Society of New Zealand 2008
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