Systems and breakdown of self-incompatibility

Ahmad, Muhammad Husnain; Rao, Muhammad Junaid; Hu, Jianbing; Xu, Qiang; Liu, Chenchen; Cao, Zonghong; Larkin, Robert M.; Deng, Xiuxin; Bosch, Marina; Chai, Lijun

doi:10.1080/07352689.2022.2093085

Cited by 18 publications

(14 citation statements)

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“…Plants with bisexual flowers have different reproductive costs associated with self-pollination. These costs can be prevented through physical and physiological anti-selfing mechanisms (Barrett 2002;Broz & Bedinger 2021;Ahmad et al 2022). Some physical mechanisms are related to the spatial and temporal separation of sexual functions, called herkogamy and dichogamy, respectively Barrett 2002;Cardoso et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Second, they reduce physical sexual interference between male and female functions, avoiding stigma clogging and gamete discounting (i.e., loss of pollen and ovules that could be used for outcrossing) Barrett 2002;Schreiber et al 2015). On the other hand, physiological mechanisms are usually associated with self-incompatibility (SI) systems (de Nettancourt 1977;Allen & Hiscock 2008;Gibbs 2014;Ahmad et al 2022). In fact, SI is considered the most important mechanism that avoids selfing and promotes crossing in angiosperms (de Nettancourt 1977;Allen & Hiscock 2008;Ahmad et al 2022).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, physiological mechanisms are usually associated with self-incompatibility (SI) systems (de Nettancourt 1977;Allen & Hiscock 2008;Gibbs 2014;Ahmad et al 2022). In fact, SI is considered the most important mechanism that avoids selfing and promotes crossing in angiosperms (de Nettancourt 1977;Allen & Hiscock 2008;Ahmad et al 2022). The expression of physical and physiological mechanisms varies across the different angiosperm clades ).…”

Section: Introductionmentioning

confidence: 99%

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First evidence of late‐acting self‐incompatibility in the Aristolochiaceae

Matallana‐Puerto,

Duarte,

Aguilar Fachin

et al. 2024

Plant Biol J

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Most Aristolochiaceae species studied so far are from temperate regions, bearing self‐compatible protogynous trap flowers. Although self‐incompatibility has been suggested for tropical species, the causes of self‐sterility in this family remain unknown. To fill this gap, we studied the pollination of the tropical Aristolochia esperanzae, including the physical and physiological anti‐selfing mechanisms. Floral visitors trapped inside flowers were collected to determine the pollinators. Protogyny was characterized by observing the temporal expression of sexual phases and stigmatic receptivity tests. The breeding system was investigated using hand‐pollination treatments. Pollen tube growth was observed using epifluorescence to identify the self‐incompatibility mechanism. Flies were the most frequent visitors found inside A. esperanzae trap flowers, with individuals from the family Ulidiidae being potential pollinators since they carried pollen. The characteristic flower odour and presence of larvae indicate that A. esperanzae deceives flies through oviposition‐site mimicry. Although this species showed incomplete protogyny, stigmatic receptivity decreased during the male phase, avoiding self‐pollination. Fruits developed only after cross‐ and open pollination, indicating that the population is non‐autonomous, non‐apomictic, and self‐sterile. This occurred through a delay in the growth of geitonogamous pollen tubes to the ovary and lower ovule penetration, indicating a late‐acting self‐incompatibility mechanism. Our findings expand the number of families in which late‐acting self‐incompatibility has been reported, demonstrating that it is more widespread than previously thought, especially when considering less‐studied tropical species among the basal angiosperms.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First evidence of late‐acting self‐incompatibility in the Aristolochiaceae

Matallana‐Puerto,

Duarte,

Aguilar Fachin

et al. 2024

Plant Biol J

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“…Calcium (Ca 2+ ) signaling has been identified as a crucial factor in the detection and/or suppression of self-pollen in SI mechanisms [ 16 ]. Partial alleviation of SI can be achieved by administering chemical reagents that modulate Ca 2+ channeling across cell membranes to self-pollinated stigmas [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Mapping quantitative trait loci associated with self-(in)compatibility in goji berries (Lycium barbarum)

Wang,

Qin,

Shang

et al. 2024

BMC Plant Biol

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Background Goji (Lycium barbarum L.) is a perennial deciduous shrub widely distributed in arid and semiarid regions of Northwest China. It is highly valued for its medicinal and functional properties. Most goji varieties are naturally self-incompatible, posing challenges in breeding and cultivation. Self-incompatibility is a complex genetic trait, with ongoing debates regarding the number of self-incompatible loci. To date, no genetic mappings has been conducted for S loci or other loci related to self-incompatibility in goji. Results We used genome resequencing to create a high-resolution map for detecting de novo single-nucleotide polymorphisms (SNP) in goji. We focused on 229 F1 individuals from self-compatible ‘13–19’ and self-incompatible ‘new 9’ varieties. Subsequently, we conducted a quantitative trait locus (QTL) analysis on traits associated with self-compatibility in goji berries. The genetic map consisted of 249,327 SNPs distributed across 12 linkage groups (LGs), spanning a total distance of 1243.74 cM, with an average interval of 0.002 cM. Phenotypic data related to self-incompatibility, such as average fruit weight, fruit rate, compatibility index, and comparable compatibility index after self-pollination and geitonogamy, were collected for the years 2021–2022, as well as for an extra year representing the mean data from 2021 to 2022 (2021/22). A total of 43 significant QTL, corresponding to multiple traits were identified, accounting for more than 11% of the observed phenotypic variation. Notably, a specific QTL on chromosome 2 consistently appeared across different years, irrespective of the relationship between self-pollination and geitonogamy. Within the localization interval, 1180 genes were annotated, including Lba02g01102 (annotated as an S-RNase gene), which showed pistil-specific expression. Cloning of S-RNase genes revealed that the parents had two different S-RNase alleles, namely S1S11 and S2S8. S-genotype identification of the F1 population indicated segregation of the four S-alleles from the parents in the offspring, with the type of S-RNase gene significantly associated with self-compatibility. Conclusions In summary, our study provides valuable insights into the genetic mechanism underlying self-compatibility in goji berries. This highlights the importance of further positional cloning investigations and emphasizes the importance of integration of marker-assisted selection in goji breeding programs.

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“…SI is a common feature in flowering plants, occurring in approximately 40% of angiosperm species (Saumitou-Laprade et al, 2017). It results in the total or partial lack of germination of the pollen grain or development of the pollen tube due to specific interactions between pollen grain and stigma surface or transmitting tissue of the style (Ahmad et al, 2022). As far as is known, SI is prevalently controlled by a single multiallelic locus, the S-locus (Brom et al, 2020), and the combinations of the different allelic variants composing the locus define the S-haplotypes.…”

Section: Introductionmentioning

confidence: 99%

First genomic insights into the Mandevilla genus

et al. 2022

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Mandevilla (Apocynaceae) is a greatly appreciated genus in the world ornamental market. In this study, we attempted to address the poor genetic knowledge and the huge taxonomic gaps existing in this genus by analyzing a collection of 55 accessions. After cytometrically determining the triploid genome size (1,512.64 Mb) of a reference sample (variety “Mandevilla 2001”), the plastidial genome (cpDNA, 0.18 Mb) and a draft of the nuclear genome (nuDNA, 207 Mb) were assembled. While cpDNA was effective in reconstructing the phylogenesis of the Apocynaceae family based on a DNA superbarcoding approach, the nuDNA assembly length was found to be only 41% of the haploid genome size (506 Mb, predicted based on the K-mer frequency distribution). Its annotation enabled the prediction of 37,811 amino acid sequences, of which 10,562 resulted full length proteins. Among them, we identified nine proteins whose orthologs (in Catharanthus roseus) are involved in the biosynthesis of monoterpene indole alkaloids (MIAs), including catharanthine, tabersonine, and vincadifformine. The nuclear genome draft was also useful to develop a highly informative (average polymorphism information content, PIC = 0.62) set of 23 simple sequence repeat (SSR) markers that was validated on the Mandevilla collection. These results were integrated with cytometric measurements, nuclear ITS1 haplotyping and chloroplast DNA barcoding analyses to assess the origin, divergence and relationships existing among the 55 accessions object of the study. As expected, based on the scarce information available in the literature, the scenario was extremely intricate. A reasonable hypothesis is that most of the accessions represent interspecific hybrids sharing the same species as maternal parent (i.e., Mandevilla sanderi).

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Systems and breakdown of self-incompatibility

Cited by 18 publications

References 303 publications

First evidence of late‐acting self‐incompatibility in the Aristolochiaceae

First evidence of late‐acting self‐incompatibility in the Aristolochiaceae

Mapping quantitative trait loci associated with self-(in)compatibility in goji berries (Lycium barbarum)

First genomic insights into the Mandevilla genus

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