Characterization and expression of two members of the peach 1‐aminocyclopropane‐1‐carboxylate oxidase gene family

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Abstract
The characterization and expression of PP‐ACO1 and PP‐ACO2, two members of the peach 1‐aminocyclopropane‐1‐carboxylate (ACC) oxidase (ACO) gene family, are reported. PP‐ACO1 is organized in 4 exons interrupted by 3 introns, whereas PP‐ACO2 has only 2 of the 3 introns present in PP‐ACO1. Comparison of the deduced amino acid sequences of PP‐ACO1 and PP‐ACO2 reveals a 77.7% identity. PP‐ACO1 and PP‐ACO2 show highest degree of similarity with petunia (PH‐ACO3; 84.1%) and apple (85.4%) ACO genes, respectively. PP‐ACO1 is expressed in flowers, fruitlet abscission zones, mesocarp and in young fully expanded leaves. PP‐ACO1 transcript accumulation strongly increases during fruitlet abscission, in ripe mesocarp and senescing leaves, and is enhanced by propylene. PP‐ACO2 mRNA accumulation is detected in fruits only during early development and is unaffected by propylene treatment. Both ACO genes are expressed in epicotyl and roots of growing seedlings, although a stronger accumulation of PP‐ACO2 mRNA is observed.

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