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Stability of Repeated Sequence Clusters in Hybrids of Maize as Revealed by FISH

Stability of Repeated Sequence Clusters in Hybrids of Maize as Revealed by FISH Previous studies of genome size in inbreds and hybrids had revealed that in some combinations the genome size in hybrids deviates from the midparent value of the parents. We examined whether repetitive sequence arrays such as knob heterochromatin, centromere repeats and ribosomal RNAs, as visualized cytologically in root tip chromosome spreads, would reveal any changes in copy number in such hybrids. The results indicate that no obvious changes in copy number are observed. Thus, the mechanisms by which repetitive arrays change copy number seem unrelated to the hybrid effect. Moreover, the hybrid genome effect is not manifested in gross changes in the most common repetitive sequences in the genome as determined in root tip spreads. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tropical Plant Biology Springer Journals

Stability of Repeated Sequence Clusters in Hybrids of Maize as Revealed by FISH

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Publisher
Springer Journals
Copyright
Copyright © 2008 by Springer-Verlag
Subject
Life Sciences; Ecology; Plant Anatomy/Development; Plant Genetics & Genomics; Plant Sciences
ISSN
1935-9756
eISSN
1935-9764
DOI
10.1007/s12042-007-9001-y
Publisher site
See Article on Publisher Site

Abstract

Previous studies of genome size in inbreds and hybrids had revealed that in some combinations the genome size in hybrids deviates from the midparent value of the parents. We examined whether repetitive sequence arrays such as knob heterochromatin, centromere repeats and ribosomal RNAs, as visualized cytologically in root tip chromosome spreads, would reveal any changes in copy number in such hybrids. The results indicate that no obvious changes in copy number are observed. Thus, the mechanisms by which repetitive arrays change copy number seem unrelated to the hybrid effect. Moreover, the hybrid genome effect is not manifested in gross changes in the most common repetitive sequences in the genome as determined in root tip spreads.

Journal

Tropical Plant BiologySpringer Journals

Published: Dec 20, 2007

References