ISSN:
1573-6849
Keywords:
meiotic metaphase I pairing
;
recombinant isochromosome
;
Triticum aestivum
;
Triticum dicoccoides
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A recombinant isochromosome i5BLrec of wheat was developed with one arm and the proximal 36% of the other arm of Chinese Spring (CS) origin and the distal 64% of the recombined arm of Triticum turgidum subsp. dicoccoides origin. The i5BLrec} provides an unusual opportunity to analyze the role of the centromere or arm heterozygosity in chromosome prealignment and synapsis during meiosis. In monosomic condition, the i5BLrec formed a ring univalent in 86.8% of the pollen mother cells (PMCs) at meiotic metaphase I. In the disomic condition, the two i5BLrec preferentially paired as a normal bivalent in 74.8% of the PMCs, which differed significantly (p〈0.01) from the normal bivalent pairing of 51% observed in diisosomic 5BL chromosomes of the CS (Di5BLCS) control plants. In plants with one i5BLrec and a normal 5BCS, the long arm of 5BCS paired with the homologous arm of i5BLrec in 54.4% of the PMCs, and 40.4% of the PMCs had a 5BCS univalent and a i5BLrec ring univalent. The implications of the i5BLrec pairing data on the mechanism of Ph1 gene action are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026785119376
