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Pollen competition effects in crosses of the B-A translocation TB-9Sb [Zea mays]

By: Material type: ArticleArticlePublication details: 1997ISSN:
  • 0025-6153
Subject(s): DDC classification:
  • 1998-048996
 In: Maydica v. 42, no. 2, p. 121-126Summary: The B-A translocation, TB-9Sb, is genetically very well marked. It is, therefore, relatively easy to identify the various chromosomal classes that are produced by meiosis in the translocation heterozygote and other chromosomal constructs of TB-9Sb. Robertson (1967) demonstrated this fact in his study of female transmission of TB-9Sb. In this report, male transmission of TB-9Sb chromosomes is analized, with emphasis on pollen competition effects. A proposal by Beckett (1982) that B-containing pollen outcompetes non B-containing pollen was tested. The results do not show a clear advantage of TB-9Sb pollen over normal pollen, although several explanations that reconcile the data with Beckett's theory are considered. A second test of pollen competition measured survival of the duplicate pollen class, 9 B-9. Some transmission was obtained, but pollen competition had a severely negative effect on this class, as expected
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Item type Current library Collection Call number Status Date due Barcode Item holds
Article CIMMYT Knowledge Center: John Woolston Library AGRIS Collection 1998-048996 (Browse shelf(Opens below)) Available
Total holds: 0

2 tables; 11 ref. Summary (En)

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0025-6153

The B-A translocation, TB-9Sb, is genetically very well marked. It is, therefore, relatively easy to identify the various chromosomal classes that are produced by meiosis in the translocation heterozygote and other chromosomal constructs of TB-9Sb. Robertson (1967) demonstrated this fact in his study of female transmission of TB-9Sb. In this report, male transmission of TB-9Sb chromosomes is analized, with emphasis on pollen competition effects. A proposal by Beckett (1982) that B-containing pollen outcompetes non B-containing pollen was tested. The results do not show a clear advantage of TB-9Sb pollen over normal pollen, although several explanations that reconcile the data with Beckett's theory are considered. A second test of pollen competition measured survival of the duplicate pollen class, 9 B-9. Some transmission was obtained, but pollen competition had a severely negative effect on this class, as expected

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