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 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.

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.

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.

This volume covers the advances in the study of tomato diversity and taxonomy. It examines the mapping of simple and complex traits, classical genetics and breeding, association studies, molecular breeding, positional cloning, and structural and comparative genomics. The contributors also discuss transcriptomics, proteomics, metabolomics, and bioinformatics. The information in this book will be useful to researchers working on other Solanaceaous crops as well as those interested in using the tomato as a model crop species.

This book focuses on the latest genome sequencing of the 25 wild Oryza species, public and private genomic resources, and their impact on genetic improvement research. It also addresses the untapped reservoir of agronomically important traits in wild Oryza species. Rice is a model crop plant that is frequently used to address several basic questions in plant biology, yet its wild relatives offer an untapped source of agronomically important alleles that are absent in the rice gene pool. The genus Oryza is extremely diverse, as indicated by a wide range of chromosome numbers, different ploidy levels and genome sizes. After a 13-year gap from the first sequencing of rice in the 2002, the genomes of 11 wild Oryza species have now been sequenced and more will follow. These vast genomic resources are extremely useful for addressing several basic questions on the origin of the genus, evolutionary relationships between the species, domestication, and environmental adaptation, and also help to substantiate molecular breeding and pre-breeding work to introgress useful characters horizontally from wild species into cultivated rice.

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.

This book collates the most up to date information on Fragaria, and Rubus genomes. It focuses on the latest advances in the model system Fragaria vesca, along with the allied advances in economically important crops. Covering both basic and applied aspects of crop genomics, it illustrates strategies and resources for the study and utilization of genome sequences and aligned functional genomics resources. Rosaceous berries are collectively an increasingly important set of high-value global crops, with a trade value of over £2 billion dollars per annum. The rosaceous berries strawberry, raspberry and blackberry share some common features at the genome scale, namely a range of ploidy levels in each genus and high levels of heterozygosity (and associated inbreeding depression) due to self-incompatibility systems, dioecy, or multispecies hybridization events. Taken together, although the genomes are relatively compact, these biological features lead to significant challenges in the assembly and analysis of berry genomes, which until very recently have hampered the progress of genome-level studies. The genome of the woodland strawberry, Fragaria vesca, a self-compatible species with a homozygous genome was first sequenced in 2011 and has served as a foundation for most genomics work in Fragaria and to some extent Rubus. Since that time, building upon this resource, there have been significant advances in the development of genome sequences for related crop species. This, coupled with the revolution in affordable sequencing technology, has led to a suite of genomics studies on Fragaria and more recently Rubus, which undoubtedly aid crop breeding and production in future years.