Haploids in Crop Improvement ii

As per the reports of FAO, the human population will rise to 9 billion by the end of 2050 and 70% of more food must be produced over the next three decades to feed the additional population. The breeding approaches for crop improvement programs are dependent on the availability and accessibility of genetic variation, either spontaneous or induced by the mutagens. Plant breeders, agronomists, and geneticists are under constant pressure to expand food production by employing innovative breeding strategies to enhance yield, adaptability, nutrition, resistance to biotic and abiotic stresses.

The green revolution led to the development of improved varieties of crops, especially cereals, and since then, classical or molecular breeding has resulted in the creation of economically valuable species. Thanks to recent developments in biotechnology, it has become possible to introduce genes from different sources, such as bacteria, fungi, viruses, mice and humans, to plants. This technology has made the scientific community aware of the critical role of transgenic, not only as a means of producing stress tolerant crops but also as a platform for the production of therapeutics through molecular farming. Biotechnology and　Crop　Improvement: Tissue Culture and Transgenic Approaches focuses on important field crops to highlight germplasm enhancement for developing resistance to newly emerging diseases, pests, nutrient- and water-use efficiency, root traits and improved tolerance to increasing temperature and introduces significant recent achievements in crop improvement using methods such as micropropagation, somaclonal variation, somatic embryogenesis, anther/pollen/embryo culture, and compressing the breeding cycle for accelerated breeding and early release of crop varieties.

Under ongoing climate change, natural and cultivated habitats of major food crops are being continuously disturbed. Such condition accelerates to impose stress effects like abiotic and biotic stressors. Drought, salinity, flood, cold, heat, heavy metals, metalloids, oxidants, irradiation etc. are important abiotic stresses; and diseases and infections caused by plant pathogens viz. fungal agents, bacteria and viruses are major biotic stresses. As a result, these harsh environments affect crop productivity and its biology in multiple complex paradigms. As stresses become the limiting factors for agricultural productivity and exert detrimental role on growth and yield of the crops, scientists and researchers are challenged to maintain global food security for a rising world population.