Over Expression of Mango MiGA2ox12 in Tobacco Reduced Plant Height by Reducing GA₁ and GA₄ Content

The regulation of gibberellic acid 2-oxidase (GA2ox) gene expression represents a critical mechanism in the modulation of endogenous gibberellic acids (GAs) levels, thereby exerting an influence on plant height. In this context, we conducted a comprehensive genome-wide analysis of the GA2ox gene family in mango (Mangifera indica L.), a species of significant economic importance, with the aim of identifying potential candidate genes for mango dwarf breeding. Our findings delineated the presence of at least 14 members within the MiGA2ox gene family in the mango genome, which were further categorized into three subfamilies: C₁₉-GA2ox-I, C₁₉-GA2ox-II, and C₂₀-GA2ox-I. Notably, MiGA2ox12, a member of the C₁₉-GA2ox-II subfamily, exhibited substantial expression across various tissues, including roots, bark, leaves, and flowers. Through overexpression of the MiGA2ox12 gene in tobacco, a distinct dwarf phenotype was observed alongside reduced levels of GA₁ and GA₄, while the knockout line exhibited contrasting traits. This provides evidence suggesting that MiGA2ox12 may exert control over plant height by modulating GA content. Consequently, the MiGA2ox12 gene emerges as a promising candidate for facilitating advancements in mango dwarfing techniques.