Abstract
Current knowledge suggests that not all genomic information transmits across subsequent generations. Variability in date palm genomes comes from the infidelity of DNA replication and segregation of unequal chromosomes. DNA lesions in nature are also the source of genomic alteration. Additionally, exposure of explants to external factors such as UV light and chemical mutagens can result in a new useful mutation. Biological cell systems deal naturally with the numerous DNA damages to maintain the date palm genome integrity by evolving several response systems such as checkpoint responses to various DNA damage types. Checkpoints are a well-known control mechanism in the plant cell cycle and respond to DNA replication breaks of dsDNA and diverse other types of DNA damage. Varied evidence indicates that genomic instability is probably the key reason for mutagenesis and the main factor in releasing new desirable mutants against abiotic stress. Thus, understanding how date palm tissues are regulated to maintain their genomic stability is offundamental importance. The range of variation is a selective characteristic resulting from the biological systems across date palm tissue culture. This chapter highlights the causes and sources of genomic instability, genetic alterations, and genetic behavior across date palm tissue cultures.