Occurrence of Spontaneous Triploidy in Manihot esculenta Crantz.

• Carvalho Reginaldo de

  Departamento de Botânica (CCB), Universidade Federal de Pernambuco

• Guerra Marcelo

  Departamento de Botânica (CCB), Universidade Federal de Pernambuco

• Carvalho Paulo Cezar L. de

  Departamento de Fitotecnia, Escola de Agronomia de Cruz das Almas, Cruz das Almas

Abstract

The spontaneous occurrence of a triploid is reported in Manihot esculenta Crantz collected in Sapé-PB, Brazil. Mitotic analysis showed a stable chromosome number of 2n=54, with chromosome size and morphology very similar to the diploid species. The chromosome behavior in meiosis was irregular in the metaphase-anaphase I, with occurrence of uni, bi and trivalents. The average number of univalents per cell was 7.2. In the tetrad stage, a higher number of micronuclei were found, resulting in almost 100% of abnormal tetrads and pollen sterility. Triploid was also characterized by having larger and fewer stomata than diploid species.

Journal

• CYTOLOGIA

  CYTOLOGIA 64 (2), 137-140, 1999

  Japan Mendel Society, International Society of Cytology

Keywords

• Manihot esculenta
• Spontaneous triploidy
• Microsporogenesis
• Stomata

Details

• CRID: 1390282679082492416
• NII Article ID: 10002795482
• NII Book ID: AA00622764
• DOI: 10.1508/cytologia.64.137
• ISSN: 13487019
• ISSN: 00114545
• ISSN: http://id.crossref.org/issn/00114545
• Web Site: http://www.jstage.jst.go.jp/article/cytologia1929/64/2/64_2_137/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed