Effect of Auxin on ethylene biosynthesis of peach fruit ripening

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The fruit of stony hard peach cultivars do not soften and produce little ethylene due to low expression of PpACS1. The IAA concentration increased suddenly just before harvest time in melting flesh peaches. In contrast, the IAA concentration did not increase in stony hard peaches. These observations indicate that suppression of PpACS1 expression at the late-ripening stage of stony hard peach may result from a low level of IAA, and a high concentration of IAA is required to generate a large amount of system 2 ethylene in peaches.