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(American Journal of Botany. 2000;87:1189-1192.)
© 2000 Botanical Society of America, Inc.

Occurrence of plastids in rye (Poaceae) sperm cells1

H. Lloyd Mogensen2,0 and Maxine Losoff Rusche0

0 Department of Biological Sciences, Box 5640, Northern Arizona University, Flagstaff, Arizona 86011 USA

ABSTRACT

Studies using classic genetics as well as restriction fragment length polymorphism analysis have demonstrated that rye, unlike most flowering plants, has biparental inheritance of both plastids and mitochondria. Yet, a previous in-depth ultrastructural study found no plastids in rye sperm cells, and DNA-specific staining revealed no cytoplasmic DNA in the male gametes of this plant. In the present study, we examined serial ultrathin sections of eight rye sperm cells (four pairs) and found unambiguous examples of plastids in all cases. The number of plastids per sperm cell varies from two to 12. The sperm of a pair may vary with regard to plastid number; however, these differences are not consistent among the sperm pairs examined.

Key Words: cytoplasmic inheritance • Poaceae • Secale cereale • sperm cells • sperm dimorphism • three-dimensional reconstruction






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