Article

Plant Systematics and Evolution

, Volume 160, Issue 3, pp 207-218

Apomixis versus sexuality in blackberries (Rubus subgen.Rubus, Rosaceae)

  • Hilde NybomAffiliated withDepartment of Systematic Botany, University of Lund

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Abstract

InRubus L. a connection seems to exist between the degree of meiotic disturbances on the one hand, and the production of unreduced embryo sacs, pollen fertility and relative seed set on the other hand. Severe meiotic disturbances commonly encountered in apomictic taxa decrease pollen fertility and thereby seed set since pollen is necessary for endosperm development. By contrast interspecific hybrids between apomictic taxa appear to be sexual and exhibit high pollen fertilities, probably due to an improved meiosis. Thus, apomixis leads to a decreased fertility inRubus, not the opposite, as often discussed.

Key words

Angiosperms Rosaceae Rubus Apomixis pseudogamy crossing experiments meiotic disturbances pollen fertility seed set