The Chickpea Genome

This book sheds new light on the chickpea genome sequencing and resequencing of chickpea germplasm lines and provides insights into classical genetics, cytogenetics, and trait mapping. It also offers an overview of the latest advances in genome sequencing and analysis. The growing human population, rapid climate changes and limited amounts of arable land are creating substantial challenges in connection with the availability and affordability of nutritious food for smallholder farmers in developing countries. In this context, climate smart crops are essential to alleviating the hunger of the millions of poor and undernourished people living in developing countries. In addition to cereals, grain legumes are an integral part of the human diet and provide sustainable income for smallholder farmers in the arid and semi-arid regions of the world. Among grain legumes, the chickpea (Cicer arietinum) is the second most important in terms of production and productivity. Besides being a rich source of proteins, it can fix atmospheric nitrogen through symbiosis with rhizobia and increase the input of combined nitrogen. Several abiotic stresses like drought, heat, salinity, together with biotic stresses like Fusarium wilt, Ascochyta blight, and Botrytis grey mould have led to production losses, as the chickpeas is typically grown in the harsh climates of our planet’s semi-arid regions.

Chickpea: Crop Wild Relatives for Enhancing Genetic Gains explores aspects related to critical analysis on factors responsible for narrow genetic base of chickpea productions including domestication bottleneck, the level of diversity present in different cultivated and wild species, the uniqueness and usefulness of potential gene sources available and maintained in production systems across the globe, the level of genetic erosion both at landrace and species level over time and space etc. Despite considerable international investment in conventional breeding, production of chickpea has not yet been significantly improved beyond that achieved through its normal single domestication event and high self-pollination rate. Total annual pulse production of ~12 million tons (FAO 2016) is far below actual potential. Susceptibility to both biotic and abiotic stresses have created a production level bottleneck whose solution possibly lies in the use of crop wild relatives and other genetic traits cultivated by tailoring novel germplasm. Presenting options for widening the genetic base of chickpea cultivars by introgression of diverse genes available in distantly related wild Cicer taxa, thus expanding the genetic base and maximize genetic gains from the selection, it is necessary to accumulate other complimentary alleles from CWRs. This review will focus on present status of gene pool and species distribution, germplasm conservation, characterization and evaluation, problems associated with crop production, sources of target traits available in wild species, status of trait introgression in synthesizing new gene pool of chickpea along with progress made in chickpea genomics. An edited book with contributions from leading scientists, this information will guide and inform chickpea breeders, PGR researchers and crop biologists across the world. Presents both conventional and emerging techniques Provides insights into gene pyramiding as cytogenic manipulations Includes case studies highlighting the impact of improving chickpea production

Chickpea (Cicer arietinum L.) is a self-pollinated leguminous crop, positioning third after dry beans (Phaseolus vulgaris L.) and dry peas (Pisum sativum L.) in the world. Chickpea passes by a few basic names, including garbanzo beans, ceci beans, sanagalu, kala chana, and Bengal gram. (Gujrathi), and Chanaka (Sanskrit). The name Cicer is of Latin origin and is derived from the Greek word 'kikus' which means power or quality. It belongs to the Fabaceae family with subfamily Faboideae, having diploid (2n = 2x =16) chromosome number with a relatively small genome size of 740 Mbp. The genome of chickpea has been sequenced. The -738 Mb draft whole genome shotgun sequence of kabuli chickpea variety, CDC Frontier, which contains an estimated 28,269 genes and a few million hereditary markers. In view of seed size and shading, the developed chickpeas are of two primary sorts; desi chickpeas microsperma (seeds little in size, light to dim darker in shading, thick seed coat) and kabuli chickpeas macrosperma (seeds bolder than the Desi types, whitish-cream shading, slim seed coat). Desi chickpeas most noticeable, representing near 80% of worldwide generation. Desi assortments are developed principally in the Indian Subcontinent and in Ethiopia, Mexico and Iran while kabuli chickpeas are developed generally in Southern Europe, Northern Africa, Afghanistan, Pakistan and Chile and too little degree in the Indian Subcontinent. The chickpea is likewise developed in Australia, Canada and USA, principally for send out. The chickpea is probably originated from South East Turkey. Four centres of diversity were identified in the Mediterranean, Central Asia, the Near East and India as well as a secondary centre of origin in Ethiopia.

This Research Topic is part of the Abiotic Stress Signaling in Plants: Functional Genomic Intervention series: Abiotic Stress Signaling in Plants: Functional Genomic Intervention Abiotic stresses such as high temperature, low-temperature, drought and salinity limit crop productivity worldwide. Understanding plant responses to these stresses is essential for rational engineering of crop plants. In Arabidopsis, the signal transduction pathways for abiotic stresses, light, several phytohormones and pathogenesis have been elucidated. A significant portion of plant genomes (most studies are Arabidopsis and rice genome) encodes for proteins involves in signaling such as receptor, sensors, kinases, phosphatases, transcription factors and transporters/channels. Despite decades of physiological and molecular effort, knowledge pertaining to how plants sense and transduce low and high temperature, low-water availability (drought), water-submergence and salinity signals is still a major question before plant biologist. One major constraint hampering our understanding of these signal transduction processes in plants has been the lack or slow pace of application of molecular genomic and genetics knowledge in the form of gene function.

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.