Physical mapping of 45S and 5S rDNA on maize metaphase and sorted chromosomes by FISH.

Abstract:

:Physical locations of 45S and 5S rDNA were detected in maize by fluorescence in situ hybridization (FISH). The FISH results on metaphase chromosome spreads showed the 45S rDNA was located just at the nucleolus organizer region (NOR) on 6S (the short arm) of chromosome 6) as expected, and 5S rDNA at the distal region of 2L (the long arm of chromosome 2). No signals were detected on the other maize chromosomes for these two probes. The precision of the chromosomal position of a hybridization site is related to the number of measurements. We also mapped the location of 5S rDNA at the same sites on 2L by FISH on sorted chromosomes. We could calculate more precisely the percentage distance of hybridization signals since we had large numbers of target chromosomes on a small spot on the slide by flow sorting. The percentage distance from centromere to the hybridization site was 85% for 5S rDNA on 2L. The physical location of 5S rDNA was inconsistent with its genetic site, which was positioned in the middle of genetic linkage group 2. A FISH procedure for mapping genes on sorted plant chromosomes is described and occurrence of only one 45S or 5S rDNA site on maize genome is discussed.

journal_name

Hereditas

journal_title

Hereditas

authors

Li L,Arumuganathan K

doi

10.1111/j.1601-5223.2001.00141.x

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

141-5

issue

2

eissn

0018-0661

issn

1601-5223

journal_volume

134

pub_type

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