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Digitale Medien

Variation in generative cell plastid nucleoids and male fertility in Medicago sativa (1995)

Keys, R. N. ; Smith, S. E. ; Mogensen, H. L.

Springer

Sexual plant reproduction 8 (1995), S. 308-312

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ISSN: 1432-2145

Schlagwort(e): Alfalfa ; Chloroplast ; Organelle inheritance ; Pollen

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Biparental inheritance of plastids has been documented in numerous angiosperm species. The adaptive significance of the mode of plastid inheritance (unior biparental) is poorly understood. In plants exhibiting paternal inheritance of plastids, DNA-containing plastids in the microgametophyte may affect survival or growth of the gametophyte or the embryo. In this study the number of plastids containing DNA (nucleoids) in generative cells and generative cell and pollen volumes were evaluated in a range of genotypes of Medicago sativa (alfalfa). M. sativa exhibits biparental inheritance of plastids with strong paternal bias. The M. sativa genotypes used were crossed as male parents to a common genotype and the relationships between the gametophytic traits measured and male reproductive success were assessed. Generative cell plastid number and pollen grain size exhibited opposing associations with male fertility. Path analysis showed that generative cell plastid number was negatively associated with male fertility. This study provides evidence that there may be a competitive advantage at fertilization afforded sperm that have minimized their organelle content. The apparent lack of strong selection for reduced plastid number in generative cells of M. sativa may be a reflection of the diminished importance of reproductive success due to its perenniality or its long use in cultivation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00229388

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Digitale Medien

Microgametophytic plastid nucleoid content and reproductive and life history traits of tribeTrifolieae (Fabaceae) (1995)

Keys, R. N. ; Smith, S. E. ; Mogensen, H. Lloyd ; [weitere]

Springer

Plant systematics and evolution 196 (1995), S. 89-98

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ISSN: 1615-6110

Schlagwort(e): Leguminosae ; Medicago ; alfalfa ; Microgametophyte ; biparental inheritance ; DAPI

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Microgametophytic plastid nucleoids were quantified for 18 species representing the four core genera of the tribeTrifolieae (Fabaceae),Medicago, Melilotus, Trigonella, andTrifolium. Generative cells of all taxa contained nucleoids, establishing that biparental plastid inheritance is common in theTrifolieae. Nucleoid number and volumes of pollen grains and generative cell nuclei differed among taxa. Nucleoid number was positively correlated with pollen grain and generative cell nuclear volumes, flower size and style length. These relationships disappeared after adjusting nucleoid number for pollen grain and generative cell nuclear volumes. Adjusted nucleoid numbers provided no evidence to support hypotheses that plastid content is associated with ploidy level, mating system, perenniality or size of the reproductive apparatus.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00985337

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