The Wild Solanums Genomes

This book gathers the latest information on the organization of genomes in wild Solanum species and emphasizes how this information is yielding direct outcomes in the fields of molecular breeding, as well as a better understanding of both the patterns and processes of evolution. Cultivated Solanums, such as potato, tomato, and pepper, possess a high number of wild relatives that are of great importance for practical breeding and evolutionary studies. Their germplasm is often characterized by allelic diversity, as well as genes that are lacking in the cultivated species. Wild Solanums have not been fully exploited by breeders. This is mainly due to the lack of information regarding their genetics and genomics. However, the genome of important cultivated Solanaceae such as potato, tomato, eggplant, and pepper has already been sequenced. On the heels of these recent developments, wild Solanum genomes are now becoming available, opening an exciting new era for both basic research and varietal development in the Solanaceae.

This book describes the historical importance of potato (Solanum tuberosum L.),potato genetic resources and stocks (including S. tuberosum group Phureja DM1-3 516 R44, a unique doubled monoploid homozygous line) used for potato genome sequencing. It also discusses strategies and tools for high-throughput sequencing, sequence assembly, annotation, analysis, repetitive sequences and genotyping-by-sequencing approaches. Potato (Solanum tuberosum L.; 2n = 4x = 48) is the fourth most important food crop of the world after rice, wheat and maize and holds great potential to ensure both food and nutritional security. It is an autotetraploid crop with complex genetics, acute inbreeding depression and a highly heterozygous nature. Further, the book examines the recent discovery of whole genome sequencing of a few wild potato species genomes, genomics in management and genetic enhancement of Solanum species, new strategies towards durable potato late blight resistance, structural analysis of resistance genes, genomics resources for abiotic stress management, as well as somatic cell genetics and modern approaches in true-potato-seed technology. The complete genome sequence provides a better understanding of potato biology, underpinning evolutionary process, genetics, breeding and molecular efforts to improve various important traits involved in potato growth and development.

This book describes the strategy used for sequencing, assembling and annotating the tomato genome and presents the main characteristics of this sequence with a special focus on repeated sequences and the ancestral polyploidy events. It also includes the chloroplast and mitochondrial genomes. Tomato (Solanum lycopersicum) is a major crop plant as well as a model for fruit development, and the availability of the genome sequence has completely changed the paradigm of the species’ genetics and genomics. The book describes the numerous genetic and genomic resources available, the identified genes and quantitative trait locus (QTL) identified, as well as the strong synteny across Solanaceae species. Lastly, it discusses the consequences of the availability of a high-quality genome sequence of the cultivated species for the research community. It is a valuable resource for students and researchers interested in the genetics and genomics of tomato and Solanaceae.

The book discusses the importance of eggplant (Solanum melongena L.) as a crop, highlighting the potential for eggplant to serve as a model for understanding several evolutionary and taxonomic questions. It also explores the genomic make-up, in particular in comparison to other Solanaceous crops, and examines the parallels between eggplant and tomato domestication as well as between the most common eggplant species and two related eggplants native to Africa (Ethiopian eggplant [Solanum aethiopicum L.] and African eggplant [Solanum macrocarpon L.]). The eggplant genome was first sequenced in 2014, and an improved version was due to be released in 2017. Further investigations have revealed the relationships between wild species, domesticated eggplant, and feral weedy eggplant (derived from the domesticate), as well as targets of selection during domestication. Parallels between eggplant and tomato domestication loci are well known and the molecular basis is currently being investigated. Eggplant is a source of nutrition for millions of people worldwide, especially in Southeast Asia where it is a staple food source. Domesticated in the old world, in contrast to its congeners tomato and potato, the eggplant is morphologically and nutritionally diverse. The spread of wild eggplants from Africa is particularly interesting from a cultural point of view. This book brings together diverse fields of research, from bioinformatics to taxonomy to nutrition to allow readers to fully understand eggplant’s importance and potential.

Wild crop relatives are now playing a significant part in the elucidation and improvement of the genomes of their cultivated counterparts. This work includes comprehensive examinations of the status, origin, distribution, morphology, cytology, genetic diversity and available genetic and genomic resources of numerous wild crop relatives, as well as of their evolution and phylogenetic relationship. Further topics include their role as model plants, genetic erosion and conservation efforts, and their domestication for the purposes of bioenergy, phytomedicines, nutraceuticals and phytoremediation. Wild Crop Relatives: Genomic and Breeding Resources comprises 10 volumes on Cereals, Millets and Grasses, Oilseeds, Legume Crops and Forages, Vegetables, Temperate Fruits, Tropical and Subtropical Fruits, Industrial Crops, Plantation and Ornamental Crops, and Forest Trees. It contains 125 chapters written by nearly 400 well-known authors from about 40 countries.

Wild crop relatives are now playing a significant part in the elucidation and improvement of the genomes of their cultivated counterparts. This work includes comprehensive examinations of the status, origin, distribution, morphology, cytology, genetic diversity and available genetic and genomic resources of numerous wild crop relatives, as well as of their evolution and phylogenetic relationship. Further topics include their role as model plants, genetic erosion and conservation efforts, and their domestication for the purposes of bioenergy, phytomedicines, nutraceuticals and phytoremediation. Wild Crop Relatives: Genomic and Breeding Resources comprises 10 volumes on Cereals, Millets and Grasses, Oilseeds, Legume Crops and Forages, Vegetables, Temperate Fruits, Tropical and Subtropical Fruits, Industrial Crops, Plantation and Ornamental Crops, and Forest Trees. It contains 125 chapters written by nearly 400 well-known authors from about 40 countries.

"Potato (Solanum tuberosum L.) originated in the South American Andes and is an economically important staple crop that can be successfully grown in various conditions and altitudes. The potato genome is complex, with a large gene pool drawn from numerous wild species of varying ploidy levels ranging from diploids to hexaploids. Potato breeding efforts in North America and Europe have traditionally focused on vegetative propagation of tetraploid potato because of its higher yield. However, due to the high heterozygosity levels and difficulties of tetraploid breeding, new improvement efforts are increasingly looking to diploid species as a means of introgressing traits into crop varieties.Genome sequence data and means of analyzing and visualizing the data, are crucial to achieve this goal. Significant work has previously been done by sequencing and publishing different potato reference genomes, a double monoploid (S. tuberosum Group Phureja - DM), two wild reference genomes (S. commersonii and S. chacoense clone M6), a landrace genome (S. stenotomum subsp. goniocalyx), and two diploid S. tuberosum genomes (Solanum tuberosum group Tuberosum RH89-039-16, Solanum tuberosum, Solyntus).The present study focuses on expanding the genomic resources for potato genome analyses. First, this study presents a newly sequenced and assembled diploid genome of S. bukasovii, which is thought to be one of the wild species that is most closely related to the cultivated potato. This genome sequence is compared with the available potato reference genomes and the results show that Copy Number Variation (CNV) affect genes have important functions such as disease resistance and metabolite biosynthesis. Second, a web portal - the Potato Genome Diversity Portal (PGDP) - was developed and implemented to visualize the published potato genomes using JBrowse and to provide a tool to investigate the genome alignments along with aiding the structural variation analysis PGDP also enables researchers to conduct research and share data"--

The book discusses the importance of eggplant (Solanum melongena L.) as a crop, highlighting the potential for eggplant to serve as a model for understanding several evolutionary and taxonomic questions. It also explores the genomic make-up, in particular in comparison to other Solanaceous crops, and examines the parallels between eggplant and tomato domestication as well as between the most common eggplant species and two related eggplants native to Africa (Ethiopian eggplant [Solanum aethiopicum L.] and African eggplant [Solanum macrocarpon L.]). The eggplant genome was first sequenced in 2014, and an improved version was due to be released in 2017. Further investigations have revealed the relationships between wild species, domesticated eggplant, and feral weedy eggplant (derived from the domesticate), as well as targets of selection during domestication. Parallels between eggplant and tomato domestication loci are well known and the molecular basis is currently being investigated. Eggplant is a source of nutrition for millions of people worldwide, especially in Southeast Asia where it is a staple food source. Domesticated in the old world, in contrast to its congeners tomato and potato, the eggplant is morphologically and nutritionally diverse. The spread of wild eggplants from Africa is particularly interesting from a cultural point of view. This book brings together diverse fields of research, from bioinformatics to taxonomy to nutrition to allow readers to fully understand eggplant's importance and potential.