Mh. Bodanesezanettini et al., ANEUPLOIDY AND CHROMOSOME MOSAICS IN HEXAPLOID WHEAT (TRITICUM-AESTIVUM (L) THELL) CULTIVARS, Cereal Research Communications, 21(4), 1993, pp. 269-275
Chromosome number instability was studied in eight Brazilian wheat cul
tivars. The overall frequency of aneuploid plants was 3.0 percent with
no significant variation among cultivars. Seven cultivars presented p
lants with chromosome mosaics in pollen mother cells (PMCs). The perce
ntage of plants with mosaics differed among cultivars, varying from 1.
8 to 60.0, with an average value of 9.0 percent. Thirty nine different
deviating chromosome numbers ranging from 11 to 58 were identified. T
he deviating cells presented a high frequency of univalents as well as
multivalents. A wide variation in the frequency of PMCs with deviatin
g chromosome number was observed among plants of the same cultivar. Al
though the plants investigated were grown in different agroecological
regions and in a growth chamber, no indication of relationship between
mosaicism and place of cultivation was found.