Genetic variation inLycopersicon pimpinellifolium: Evidence of evolutionary change in mating systems

Rick, Charles M.; Fobes, Jon F.; Holle, Miguel

doi:10.1007/bf00984147

Cited by 232 publications

(174 citation statements)

References 22 publications

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“…There was little indication that the observed level was higher then expected when correction was made for inbreeding. This result differs from those found for cultivated barley , L. pimpinellifolium (Rick et al, 1977) and Arena barbata in California (Marshall and Allard, 1970;Hamrick and Allard, 1972), but probably not in Israel (Kahler et al, in preparation). Excess heterozygosity was not found in the tetraploid Hordeumjubatum (Babbel and Wain, 1977) in which allopolyploidy could substitute for heterozygosity in providing allozyme diversity.…”

Section: Discussioncontrasting

confidence: 55%

“…populations. This conclusion parallels that of Rick et al (1977), derived from their extensive study of allozyme variation and outcrossing rates in Lycopersicon pimpinel1folium.…”

Section: Discussionsupporting

confidence: 55%

“…This material will be tested for the presence of partial male sterility. In general, however, outcrossing is such a rare event that the sample size at each site was too small to demonstrate significant variation in outcrossing from site to site, unless it had been variation of the order found by Rick et al (1977) in Lycopersicon pimpinellifolium (0-40 per cent), or Harding et al (1974) in the Lupinus nanus group (0-100 per cent).…”

Section: Observed Numbers Diversitymentioning

confidence: 99%

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Outcrossing rates and heterozygosity in natural populations of Hordeum spontaneum Koch in Israel

1978

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SUMMARYThe extent of cross-pollination was estimated quantitatively in 26 populations of wild barley (H. spontaneum) in Israel, using allozyme variation at 22 polymorphic loci. Individual population estimates varied from 0 to 9•6 per cent outcrossing. The overall average was 1 6 per cent, with a 95 per cent confidence range of 08-27 per cent. The evidence indicated that outcrossing was significantly higher in populations growing in the more mesic (2.1 per cent), than in the xeric regions (04 per cent). The average frequency of multilocus homozygosity for the 22 loci was 0963 which was in agreement with the level expected under the observed high rate of seif-fertilisation, indicating no heterozygous excess. However, the heterozygotes encountered, displayed a very high degree of multiple heterozygosity which arises from extensive gametic phase (or linkage) disequilibrium. In general, these results do not support the contention that the bulk of the genetic polymorphism found in H. spontaneum in Israel has arisen in recent times by periodic introgression from cultivated barley (H. vulgare L.). Rather they indicate that extensive genetic polymorphisms probably predates the domestication of the crop, and is maintained independently of introgression.

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Section: Discussioncontrasting

confidence: 55%

“…populations. This conclusion parallels that of Rick et al (1977), derived from their extensive study of allozyme variation and outcrossing rates in Lycopersicon pimpinel1folium.…”

Section: Discussionsupporting

confidence: 55%

Section: Observed Numbers Diversitymentioning

confidence: 99%

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Outcrossing rates and heterozygosity in natural populations of Hordeum spontaneum Koch in Israel

1978

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“…In the tomato clade, the mating system ranges between self-incompatible (SI) to self-compatible (SC) crossers (Miller and Tanksley 1990;Rick et al 1977). In general, flowers of SI plant species produce more pollen than closely related SC species, probably because a much smaller fraction of the pollen will reach a compatible stigma in the case of SI (Arroyo 1973;Baker 1955;Cruden 1977;Georgiady and Lord 2002).…”

Section: Mating System Advantages Under Ltmhmentioning

confidence: 99%

Exploring the natural variation for reproductive thermotolerance in wild tomato species

et al. 2018

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Climate change has become a serious threat for crop productivity worldwide. The increased frequency of heat waves strongly affects reproductive success and thus yield for many crop species, implying that breeding for thermotolerant cultivars is critical for food security. Insight into the genetic architecture of reproductive heat tolerance contributes to our fundamental understanding of the stress sensitivity of this process and at the same time may have applied value. In the case of tomato (Solanum lycopersicum), germplasm screenings for thermotolerance have often used yield as the main measured trait. However, due to the complex nature of yield and the relatively narrow genetic variation present in the cultivated germplasm screened, there has been limited progress in understanding the genetic basis of reproductive heat tolerance. Extending the screening to wild accessions of related species that cover a range of climatic conditions might be an effective approach to find novel, more tolerant genetic resources. The purpose of this study was to provide insight into the sensitivity of individual reproductive key traits (i.e. the number of pollen per flower, pollen viability and style protrusion) to heat-wave like long-term mild heat (LTMH), and determine the extent to which genetic variation exists for these traits among wild tomato species. We found that these traits were highly variable among the screened accessions. Although no overall thermotolerant species were identified, several S. pimpinellifolium individuals outperformed the best performing cultivar in terms of pollen viability under LTMH. Furthermore, we reveal that there has been local adaptation of reproductive heat tolerance, as accessions from lower elevations and higher annual temperature are more likely to show high pollen viability under LTMH.

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“…Several studies of species with mixed-mating systems have shown a positive correlation between population outcrossing rate and mean anther-stigma separation (Rick et a!., 1977;Dole, 1991;Holtsford & Ellstrand, 1992;Belaoussoff & Shore, 1995). Despite considerable theoretical interest concerning the evolution of self-fertilization in natural populations (Holsinger, 1992;Jarne & Charlesworth, 1993;WaIler, 1993), much less is known about the relationship between herkogamy and outcrossing within populations.…”

Section: Introductionmentioning

confidence: 99%

Outcrossing rates of individual Mimulus ringens genets are correlated with anther–stigma separation

et al. 1997

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Anther-stigma separation (herkogamy) is highly variable within populations of Mimulus ringens, a bumblebee-pollinated perennial herb with a mixed-mating system. The relationship between this floral trait and individual outcrossing rates was studied in two experimental populations composed of genets with unique multilocus combinations of homozygous genotypes. This facilitated determination of individual outcrossing rates through unambiguous assignment of paternity to all 1560 sampled progeny. In each population there was significant heterogeneity among maternal families in frequencies of self and outcross progeny. Individual outcrossing rates were positively correlated with anther-stigma separation.

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Genetic variation inLycopersicon pimpinellifolium: Evidence of evolutionary change in mating systems

Cited by 232 publications

References 22 publications

Outcrossing rates and heterozygosity in natural populations of Hordeum spontaneum Koch in Israel

Outcrossing rates and heterozygosity in natural populations of Hordeum spontaneum Koch in Israel

Exploring the natural variation for reproductive thermotolerance in wild tomato species

Outcrossing rates of individual Mimulus ringens genets are correlated with anther–stigma separation

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