The Self-Incompatibility Fertilization System in Rosaceae: Agricultural and Genetic Aspects

Martin, Gottfried; Stern, Raphael A.; Zisovich, Annat; Raz, Amir; Sapir, Gal; Schnieder, D.; Nyska, Reut

doi:10.17660/actahortic.2012.967.7

Cited by 10 publications

(7 citation statements)

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“…In order to guarantee fruit set, commercial pear orchards need to contain at least two cross-compatible cultivars or combine the commercial cultivar with a pollen donor variety, such as a wild pear species. Moreover, both cultivars involved should exhibit overlapping flowering periods to enable effective cross-fertilization, i.e., to enable seed set which in its turn stimulates fruit development (Goldway et al., 2012). The identification and knowledge of the exact S-genotype of different pear varieties is hence crucial for many practical applications, including orchard design and the success of hybridization crosses in pear breeding programs (Sanzol and Robbins, 2008).…”

Section: Practical Aspects Of Gsi In Pyrus: Pollination and Fruit Setmentioning

confidence: 99%

Finding a Compatible Partner: Self-Incompatibility in European Pear (Pyrus communis); Molecular Control, Genetic Determination, and Impact on Fertilization and Fruit Set

et al. 2019

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Pyrus species display a gametophytic self-incompatibility (GSI) system that actively prevents fertilization by self-pollen. The GSI mechanism in Pyrus is genetically controlled by a single locus, i.e., the S-locus, which includes at least two polymorphic and strongly linked S-determinant genes: a pistil-expressed S-RNase gene and a number of pollen-expressed SFBB genes (S-locus F-Box Brothers). Both the molecular basis of the SI mechanism and its functional expression have been widely studied in many Rosaceae fruit tree species with a particular focus on the characterization of the elusive SFBB genes and S-RNase alleles of economically important cultivars. Here, we discuss recent advances in the understanding of GSI in Pyrus and provide new insights into the mechanisms of GSI breakdown leading to self-fertilization and fruit set. Molecular analysis of S-genes in several self-compatible Pyrus cultivars has revealed mutations in both pistil- or pollen-specific parts that cause breakdown of self-incompatibility. This has significantly contributed to our understanding of the molecular and genetic mechanisms that underpin self-incompatibility. Moreover, the existence and development of self-compatible mutants open new perspectives for pear production and breeding. In this framework, possible consequences of self-fertilization on fruit set, development, and quality in pear are also reviewed.

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Section: Practical Aspects Of Gsi In Pyrus: Pollination and Fruit Setmentioning

confidence: 99%

Finding a Compatible Partner: Self-Incompatibility in European Pear (Pyrus communis); Molecular Control, Genetic Determination, and Impact on Fertilization and Fruit Set

et al. 2019

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“…As already mentioned for citrus and also described in pineapple [21], when coupled with parthenocarpy, SI enables the producing seedless fruits in mono-varietal context. Conversely, for non-parthenocarpic species or varieties, SI is a constraint, and implies mixing inter-compatible varieties with overlapping flowering periods in the same orchard [22]. SI has also important implications for breeding strategies and schemes and its determinism has been widely studied in several crop families.…”

Section: Introductionmentioning

confidence: 99%

Segregation Distortion for Male Parents in High Density Genetic Maps from Reciprocal Crosses between Two Self-Incompatible Cultivars Confirms a Gametophytic System for Self-Incompatibility in Citrus

et al. 2021

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Self-incompatibility is an important evolutionary feature in angiosperms and has major implications for breeding strategies in horticultural crops. In citrus, when coupled with parthenocarpy, it enables the production of seedless fruits in a mono-varietal orchard. A gametophytic incompatibility system with one S locus was proposed for citrus, but its molecular mechanisms remain the subject of debate. The objective of this work was to locate the S locus by the analyzing segregation distortion in reciprocal crosses of two self-incompatible citrus sharing one self-incompatible allele and to compare this location with previously published models. High density genetic maps of ‘Fortune’ mandarin and ‘Ellendale tangor’ with, respectively, 2164 SNP and 1467 SNP markers, were constructed using genotyping by sequencing data. They are highly syntenic and collinear with the clementine genome. Complete rejection of one allele was only observed in male segregation in the two parents and in only one genomic area, at the beginning of chromosome 7 of the clementine reference genome. Haplotype data in the area surrounding the theoretical S locus were in agreement with previously proposed S genotypes. Overall, our results are in full agreement with the recently proposed gametophytic S-RNase system with the S locus at the beginning of chromosome 7 of the clementine reference genome.

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“…Identical analyses on the five other pear cultivars included in this study revealed that all of them, with the exception of 'Anna', are in fact only semi-compatible with 'Celina', while 'Anna' is the only fully cross-compatible cultivar used as a pollinizer in the examined orchards. Due to the current climate change, which can cause more frequent, severe seasonal variations in weather conditions, it is recommended to seek fully compatible pear pollinizers, in order to guarantee satisfactory yields [14]. Meteorological data obtained within this study indicate weather patterns uncharacteristic for this region, such as warm and dry conditions during bloom and high post bloom temperatures.…”

Section: S-genotypingmentioning

confidence: 84%

“…In addition of being semi-or fully-compatible, a further criterion which potential pollinizers need to meet is an adequate overlapping of flowering period with the main cultivar. This criterion is essential for effective cross-fertilization and seed set which in its turn stimulates fruit development [14]. Aside from cross-compatibility and coincidental flowering time, the abundance of pollinizer trees, planted within orchards, has been reported to affect the pollinizer efficacy among pear cultivars in Nordic conditions [2].…”

Section: Introductionmentioning

confidence: 99%

S-Genotyping and Seed Paternity Testing of the Pear Cultivar ‘Celina’

et al. 2020

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The diploid Celina/QTee® (‘Colorée de Juillet’ × ‘Williams’), one of the most promising pear cultivars developed by the Norwegian breeding program Graminor, was launched in 2010. In Norway, the flowering is medium to late, while the fruits ripen in the beginning of September. The fruits are attractive with an intense red blush (50%) on a green background. Although, ‘Celina’ is cultivated in the most climatically suitable regions for fruit cultivation, present in Norway, unfavorable environmental conditions for pear pollination can have a very negative effect on fruit set and consequent yield. The aim of this study was to determine the S-alleles of ‘Celina’, as well as its frequently used pollinizers, and, through paternity testing of ‘Celina’ seeds, give a recommendation regarding the most important pollinizers of this pear cultivar. In order to accomplish this, ‘Celina’ and its potential pollinizers were all S-genotyped. After harvest, seeds collected from ‘Celina’ fruit in 2017 and 2018 were genotyped using eleven microsatellite markers. Genomic DNA was also extracted from leaf material collected from ‘Celina’, as well as from five pear cultivars used as pollinizers in the three examined orchards, and analyzed using the same marker set. Subsequently a simple sequence repeat (SSR) database was constructed and used for gene assignment analyses with the aim of quantifying pollen donor contribution from individual pollinizers. The obtained results indicate that ‘Anna’, the only examined pollinizer that was fully cross-compatible with ‘Celina’, together with ‘Fritjof’, the genotype which had the highest flowering overlap with ‘Celina’, proved to be the most successful pollinizers across all seasons and orchards. Although both cultivars were ubiquitous in the examined orchards, either as planted trees or as branches introduced during the flowering period, they were the most abundant pollinizers in only one orchard each. It is therefore possible to conclude that pollinizer abundance has a secondary significance in pollinizer success within investigated ‘Celina’ orchards.

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The Self-Incompatibility Fertilization System in Rosaceae: Agricultural and Genetic Aspects

Cited by 10 publications

References 0 publications

Finding a Compatible Partner: Self-Incompatibility in European Pear (Pyrus communis); Molecular Control, Genetic Determination, and Impact on Fertilization and Fruit Set

Finding a Compatible Partner: Self-Incompatibility in European Pear (Pyrus communis); Molecular Control, Genetic Determination, and Impact on Fertilization and Fruit Set

Segregation Distortion for Male Parents in High Density Genetic Maps from Reciprocal Crosses between Two Self-Incompatible Cultivars Confirms a Gametophytic System for Self-Incompatibility in Citrus

S-Genotyping and Seed Paternity Testing of the Pear Cultivar ‘Celina’

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