Kerngesteuerte Gynodi�zie bei Salvia nemorosa

Linnert, Gertrud

doi:10.1007/bf00888499

Cited by 6 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Salvia nemorosa, some hermaphrodites have reduced pollen fertility, especially late in the flowering season (Linnert, 1958). In several species of Geranium, hermaphrodites consist of fully male-fertile and partially male-fertile individuals (Putrament, 1962 ;Agren & Willson, 1991).…”

Section: Discussionmentioning

confidence: 99%

Partial male sterility and the evolution of nuclear gynodioecy in plants

Schultz

2002

Genet. Res.

View full text Add to dashboard Cite

Gynodioecy, a genetic dimorphism of females and hermaphrodites, is pertinent to an understanding of the evolution of plant gender, mating and genetic variability. Classical models of nuclear gynodioecy attribute the maintenance of the dimorphism to frequency-dependent selection in which the female phenotype has a fitness advantage at low frequency owing to a doubled ovule fertility. Here, I analyse explicit genetic models of nuclear gynodioecy that expand on previous work by allowing partial male sterility in combination with either fixed or dynamically evolving mutational inbreeding depression. These models demonstrate that partial male sterility causes fitness underdominance at the mating locus, which can prevent the spread of females. However, if partial male sterility is compensated by a change in selfing rate, overdominance at the mating locus can cause the spread of females. Overdominance at introduction of the male sterility allele can be caused by high inbreeding depression and a lower selfing rate in the heterozygote, by purging of mutations by a higher selfing rate in the heterozygote, and by low inbreeding depression and a higher selfing rate in the heterozygote. These processes might be of general importance in the maintenance of mating polymorphisms in plants.

show abstract

Section: Discussionmentioning

confidence: 99%

Partial male sterility and the evolution of nuclear gynodioecy in plants

Schultz

2002

Genet. Res.

View full text Add to dashboard Cite

show abstract

“…Allen (1940) discusses a further eight gynodioecious species which produce both males and females following selfing or crossing of some or all males, but the inheritance of sex in these species is not fully known. On the other hand, the heterozygous female mode of inheritance, in which male x male offspring are all males, is known for relatively few gynodioecious species-Salvia nemorosa (Linnert, 1958), Fuchsia procumbens (Godley, 1963*), F. excorticata (Godley, personal communication) and Limnanthes douglasii var. rosea (Baker, 1966).…”

Section: Discussionmentioning

confidence: 99%

Theoretical sex ratios of dioecious and gynodioecious angiosperms

1974

View full text Add to dashboard Cite

SUMMARYThe following parameters affecting the frequency of male and female plants in sexually dimorphic Angiosperms are defined: relative fecundity (as seed parent), F, differential survival, S, and gamete success, G, all as male/female quotients, and the probability of fertilisation of ovules on female plants, in terms of the number of pollinator visits to the flowers, x.Four different modes of inheritance of gynodioecy and dioecy are examined: The equilibrium frequencies of females and (for three models) the rates of change in female frequency per generation at non-equilibrium frequencies are expressed in terms of the controlling parameters.The conditions necessary for sexual dimorphism and the changes in frequencies of the sex genotypes as the number of pollinator visits increase and the relative seed fecundity decreases towards zero (dioecy) are derived for each model.Differential survival of the sexes (and differential gamete success in the heterozygous male model) cause an increase at equilibrium in the sex surviving more frequently or the sex derived from the more successful gamete. In a dioecious population, the ratio of the sexes is equal to their relative survival or their relative gamete success.Populations at non-equilibrium frequencies return more rapidly to equilibrium with the heterozygous male model than with the heterozygous female and cytoplasmic models. In the extreme case when females are lost from a population, with the heterozygous female and cytoplasmic models extinction or loss of sexual dimorphism occurs, but with the heterozygous male and dual male models sexual dimorphism is regenerated. The ability of systems with heterozygous males to regenerate dimorphism may explain the prevalence of such systems in both gynodioccious and dioecious populations.

show abstract

“…In all cases, except for S. nemorosa, the same genotype was used both as the pollen parent and seed parent for all crosses. Salvia nemorosa, however, is gynodioecious with a male sterility gene and an accompanying complex of lethality and sublethality factors (Linnert, 1958). Therefore, for crosses involving S. nemerosa, the male-sterile 'Caradonna' was used as the seed parent, and the male-fertile 'Rosenwein' was used as the pollen parent.…”

Section: Methodsmentioning

confidence: 99%

Interspecific Crossability of Selected Salvia Species and Potential Use for Crop Improvement

Tychonievich¹,

Warner²

2011

J. Amer. Soc. Hort. Sci.

View full text Add to dashboard Cite

The wide diversity in the genus Salvia represents an untapped genetic resource to improve and diversify Salvia grown as floriculture crops. Interspecific hybrids have formed naturally or by chance hybridization of cultivated plants, but the degree to which species are cross-compatible is largely unknown. The crossability of nine Salvia species selected to cover a wide range of the diversity in European and American species was evaluated in a full diallel mating scheme. Overall, crossability of the selected species was low with only five of 72 interspecific cross combinations producing viable seed, whereas all nine species were self-fertile. Successful crosses were mostly within close phylogenetic groupings. The majority of successful crosses were between species with different chromosome numbers, suggesting that chromosome number differences alone are not a major barrier to hybridization in this genus. A Salvia nemorosa × Salvia transslyvanica F2 population exhibited transgressive segregation for several horticulturally important traits, including flower size, plant height, and time to flower. Plant height was correlated positively with flower length, inflorescence branch number, and time to flower. Time to flower was correlated positively with flower length. Individuals with desirable trait combinations were identified within the population.

show abstract

Kerngesteuerte Gynodi�zie bei Salvia nemorosa

Cited by 6 publications

References 7 publications

Partial male sterility and the evolution of nuclear gynodioecy in plants

Partial male sterility and the evolution of nuclear gynodioecy in plants

Theoretical sex ratios of dioecious and gynodioecious angiosperms

Interspecific Crossability of Selected Salvia Species and Potential Use for Crop Improvement

Contact Info

Product

Resources

About