The Male Germ Unit of Zea mays: Quantitative Ultrastructure and Three-Dimensional Analysis

  • M. L. Rusche
  • H. L. Mogensen


Since the concept of the male genu unit was introduced (Dumas et al 1984) a physical association among the elements of the male genu unit has been observed in mature tricellular pollen grains of dicots, in the pollen tubes of dicots with bicellular pollen and in a IIDnocot with bicellular pollen (see Rusche 1988 for references). In IIDnocots with tricellular pollen, a physical association has not been observed in mature pollen.


Pollen Tube Sperm Cell Mature Pollen Sperm Nucleus Physical Association 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Dumas C, Knox RB, McConchie CA, Russell SO (1984) Emerging physiological concepts in fertilization. What’s New Plant Physiol 15:17–20Google Scholar
  2. Jensen WR (1974) Reproduction in flowering plants. In: Robards AW (ed) Dynamic aspects of plant ultrastructure. McGraw-Hill, London, New York, st. Louis, San Francisco, pp.481–500Google Scholar
  3. Kinnamon JC (1987) IBM PC-based three-dimensional reconstruction program. University of Colorado, BoulderGoogle Scholar
  4. McConchie CA, Hough T, Knox RB (1987) Ultrastructural analysis of the sperm cells of mature pollen of maize, Zea mays. Protoplasma 139:9–19CrossRefGoogle Scholar
  5. McConchie CA, Jobson S, Knox RB (1985) Computer-assisted reconstruction of the male germ unit in pollen of Brassica campestris. Protoplasma 127:57–63CrossRefGoogle Scholar
  6. Mogensen HL (1988) Exclusion of male mitochondria and plastids during syngamy as a basis for maternal inheritance. Proc Natl Acad Sci 85:2594–2597PubMedCrossRefGoogle Scholar
  7. Mogensen HL, Rusche ML (1985) Quantitative ultrastructural analysis of barley sperm: 1. Occurrence and mechanism of cytoplasm and organelle reduction and the question of sperm dimorphism. Protoplasma 128: 1–13CrossRefGoogle Scholar
  8. Mogensen HL, Wagner VW (1987) Association among components of the male germ unit following in vivo pollination in barley. Protoplasma 138:161–172CrossRefGoogle Scholar
  9. Rusche ML (1988) The male germ unit of Zea mays in the mature pollen grain. In: Wibns H, Kreijzer CJ (eds) Plant sperm cells as emerging tools for crop biotechnology. Wageningen, the Netherlands, In press.Google Scholar
  10. Russell SD (1984) Ultrastructure of the sperm of Plumbago zeylanica: 2. Quantitative cytology and three-dimensional reconstruction. Planta 162:385–391CrossRefGoogle Scholar
  11. Russell SD (1985) Preferential fertilization in Plumbago: Ultrastructural evidence for gamete-level recognition in an angiosperm. Proc Natl Acad Sci 82:6129–6132PubMedCrossRefGoogle Scholar
  12. Wagner VW, Mogensen HL (1988) The male germ unit in the pollen and pollen tubes of Petunia hybrida: Ultrastructural, quantitative and three-dimensional features. Protoplasma 143:101–110CrossRefGoogle Scholar
  13. Weibel ER (1979) Stereological Methods Volume 1. Academic Press, London, New York, Toronto, Sydney, San FranciscoGoogle Scholar
  14. Wibns HJ (1986) Dimorphic sperm cells in the pollen grain of Spinacia. In: Cresti M, Dallai R (eds) Biology of reproduction and cell motility in plants and animals. University of Siena, Siena, pp 193–198Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • M. L. Rusche
    • 1
  • H. L. Mogensen
    • 1
  1. 1.Department of Biological SciencesNorthern Arizona UniversityFlagstaffUSA

Personalised recommendations