“…Based on sequence homology with yeast HDACs, plant HDACs are classified into three different groups, including Reduced Potassium Dependency-3/Histone Deacetylase 1 (RPD3/HDA1), which requires a zinc ion cofactor for deacetylase activity ( Yang & Seto, 2007 ), Silent Information Regulator 2 (SIR2), which depends on nicotinamide adenine dinucleotide (NAD + ), and Histone Deacetylase 2 (HD2), which is unique in plants ( Hirschey, 2011 ; Pandey et al., 2002 ). Researchers have identified and characterized some HDAC genes in a wide range of plant species, such as maize ( Zea mays ) ( Forestan et al, 2018 ), A. thaliana ( Hollender & Liu, 2008 ), rice ( Oryza sativa ) ( Fu, Wu & Duan, 2007 ), barley ( Hordeum vulgare ) ( Demetriou et al, 2009 ), potato ( Solanum chacoense ) ( Lagacé et al, 2003 ), grape ( Vitis vinifera ) ( Busconi et al, 2009 ), tobacco ( Nicotiana tabacum ) ( Bourque et al, 2011 ), black cottonwood ( Populus trichocarpa ) ( Alinsug, Yu & Wu, 2009 ), banana ( Musa acuminata ) ( Fu et al, 2018 ), soybean ( Glycine max ) ( Yang et al, 2018 ), litchi ( Litchi chinensis ) ( Peng et al, 2017 ), common bean ( Phaseolus vulgaris ) ( Hayford et al, 2017 ), common liverwort ( Marchantia polymorpha ) ( Chu & Chen, 2018 ) and tomato ( Solanum lycopersicum ) ( Zhao et al, 2015 ), and have studied the functions of certain HDAC genes. For example, HDAC genes are involved in plant responses to stress-related hormones such as salicylic acid (SA), abscisic acid (ABA) or jasmonic acid (JA) and stress stimuli such as drought, cold, salt, and pathogens ( Ma et al, 2013 ).…”