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| 1 | ddRAD sequencing-based genotyping for population structure analysis in cultivated tomato provides new insights into the genomic diversity of Mediterranean‘da serbo’type long shelf-life germplasm显示文摘Double digest restriction-site associated sequencing(ddRAD-seq)is a flexible and cost-effective strategy for providing in-depth insights into the genetic architecture of germplasm collections.Using this methodology,we investigated the genomic diversity of a panel of 288 diverse tomato(Solanum lycopersicum L.)accessions enriched in‘da serbo’(called‘de penjar’in Spain)long shelf life(LSL)materials(152 accessions)mostly originating from Italy and Spain.The rest of the materials originate from different countries and include landraces for fresh consumption,elite cultivars,heirlooms,and breeding lines.Apart from their LSL trait,‘da serbo’landraces are of remarkable interest for their resilience.We identified 32,799 high-quality SNPs,which were used for model ancestry population structure and non-parametric hierarchical clustering.Six genetic subgroups were revealed,clearly separating most‘da serbo’landraces,but also the Spanish germplasm,suggesting a subdivision of the population based on type and geographical provenance.Linkage disequilibrium(LD)in the collection decayed very rapidly within<5 kb.We then investigated SNPs showing contrasted minor frequency allele(MAF)in‘da serbo’materials,resulting in the identification of high frequencies in this germplasm of several mutations in genes related to stress tolerance and fruit maturation such as CTR1 and JAR1.Finally,a mini-core collection of 58 accessions encompassing most of the diversity was selected for further exploitation of key traits.Our findings suggest the presence of a genetic footprint of the‘da serbo’germplasm selected in the Mediterranean basin.Moreover,we provide novel insights on LSL‘da serbo’germplasm as a promising source of alleles for tolerance to stresses. | Salvatore Esposito Teodoro Cardi Gabriele Campanelli Sara Sestili María JoséDíez Salvador Soler Jaime Prohens Pasquale Tripodi | 2020 | Horticulture Research2020，7，1： | 2 |
| 2 | Common bean SNP alleles and candidate genes affecting photosynthesis under contrasting water regimes显示文摘Water deficit is a major worldwide constraint to common bean(Phaseolus vulgaris L.)production,being photosynthesis one of the most affected physiological processes.To gain insights into the genetic basis of the photosynthetic response of common bean under water-limited conditions,a collection of 158 Portuguese accessions was grown under both well-watered and water-deficit regimes.Leaf gas-exchange parameters were measured and photosynthetic pigments quantified.The same collection was genotyped using SNP arrays,and SNP-trait associations tested considering a linear mixed model accounting for the genetic relatedness among accessions.A total of 133 SNP-trait associations were identified for net CO 2 assimilation rate,transpiration rate,stomatal conductance,and chlorophylls a and b,carotenes,and xanthophyll contents.Ninety of these associations were detected under water-deficit and 43 under well-watered conditions,with only two associations common to both treatments.Identified candidate genes revealed that stomatal regulation,protein translocation across membranes,redox mechanisms,hormone,and osmotic stress signaling were the most relevant processes involved in common bean response to water-limited conditions.These candidates are now preferential targets for common bean water-deficit-tolerance breeding.Additionally,new sources of water-deficit tolerance of Andean,Mesoamerican,and admixed origin were detected as accessions valuable for breeding,and not yet explored. | Susana Trindade Leitao Maria Catarina Bicho Priscila Pereira Maria Joao Paulo Marcos Malosetti Susana de Sousa Araujo Fred van Eeuwijk Maria Carlota Vaz Patto | 2021 | Horticulture Research2021，8，1： | 1 |
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