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Fate of multicentric and ring chromosomes induced by a new gametocidal factor located on chromosome 4Mg of Aegilops geniculata.
Chromosome Res. 2000; 8(2):133-9.CR

Abstract

A new gametocidal (Gc) factor was identified on chromosome 4Mg of Aegilops geniculata Roth. When transferred to Chinese Spring wheat, monosomic and disomic Triticum aestivum-Ae. geniculata chromosome 4Mg addition plants undergo regular first and second meiotic divisions. Male gametogenesis in disomic 4Mg addition plants also is normal. However, chromosome breakage and anaphase bridges were observed at ana/telophase of the first (29%) and second (11%) pollen mitosis in monosomic 4Mg addition plants. Gc-induced multicentric and ring chromosomes can be transmitted to the offspring and initiate breakage fusion bridge (BFB) cycles in dividing root tip meristem cells of the derived sporophytes. The fate of multicentric and ring chromosomes was analyzed in root meristems at different time intervals after seed germination. The majority of the BFB cycles ceased about 32 days after germination. Broken chromosome ends were healed either by the fusion of a centric and an acentric fragment forming terminal translocation chromosomes or as deficiencies or telocentric chromosomes. Lack of cytologically detectable telomeric repeats at the stabilized newly broken termini suggests that chromosome healing by addition of telomeric repeats may be a gradual process.

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Authors+Show Affiliations

Kynast RG
Department of Agronomy & Plant Genetics, University of Minnesota, St. Paul 55108, USA.
Friebe B
No affiliation info available
Gill BS
No affiliation info available

MeSH

CentromereDNA DamageDNA RepairGenes, PlantIn Situ Hybridization, FluorescencePoaceaeRing Chromosomes

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

10780702

Citation

Kynast, R G., et al. "Fate of Multicentric and Ring Chromosomes Induced By a New Gametocidal Factor Located On Chromosome 4Mg of Aegilops Geniculata." Chromosome Research : an International Journal On the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology, vol. 8, no. 2, 2000, pp. 133-9.
Kynast RG, Friebe B, Gill BS. Fate of multicentric and ring chromosomes induced by a new gametocidal factor located on chromosome 4Mg of Aegilops geniculata. Chromosome Res. 2000;8(2):133-9.
Kynast, R. G., Friebe, B., & Gill, B. S. (2000). Fate of multicentric and ring chromosomes induced by a new gametocidal factor located on chromosome 4Mg of Aegilops geniculata. Chromosome Research : an International Journal On the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology, 8(2), 133-9.
Kynast RG, Friebe B, Gill BS. Fate of Multicentric and Ring Chromosomes Induced By a New Gametocidal Factor Located On Chromosome 4Mg of Aegilops Geniculata. Chromosome Res. 2000;8(2):133-9. PubMed PMID: 10780702.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fate of multicentric and ring chromosomes induced by a new gametocidal factor located on chromosome 4Mg of Aegilops geniculata. AU - Kynast,R G, AU - Friebe,B, AU - Gill,B S, PY - 2000/4/26/pubmed PY - 2000/7/6/medline PY - 2000/4/26/entrez SP - 133 EP - 9 JF - Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology JO - Chromosome Res VL - 8 IS - 2 N2 - A new gametocidal (Gc) factor was identified on chromosome 4Mg of Aegilops geniculata Roth. When transferred to Chinese Spring wheat, monosomic and disomic Triticum aestivum-Ae. geniculata chromosome 4Mg addition plants undergo regular first and second meiotic divisions. Male gametogenesis in disomic 4Mg addition plants also is normal. However, chromosome breakage and anaphase bridges were observed at ana/telophase of the first (29%) and second (11%) pollen mitosis in monosomic 4Mg addition plants. Gc-induced multicentric and ring chromosomes can be transmitted to the offspring and initiate breakage fusion bridge (BFB) cycles in dividing root tip meristem cells of the derived sporophytes. The fate of multicentric and ring chromosomes was analyzed in root meristems at different time intervals after seed germination. The majority of the BFB cycles ceased about 32 days after germination. Broken chromosome ends were healed either by the fusion of a centric and an acentric fragment forming terminal translocation chromosomes or as deficiencies or telocentric chromosomes. Lack of cytologically detectable telomeric repeats at the stabilized newly broken termini suggests that chromosome healing by addition of telomeric repeats may be a gradual process. SN - 0967-3849 UR - https://www.unboundmedicine.com/medline/citation/10780702/Fate_of_multicentric_and_ring_chromosomes_induced_by_a_new_gametocidal_factor_located_on_chromosome_4Mg_of_Aegilops_geniculata_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=10780702.ui DB - PRIME DP - Unbound Medicine ER -