Natural regulatory variations of MdIAA14b links auxin signalling to fruit cell density and firmness in apple.
Fruit firmness is a major determinant of apple quality and shelf life. It is known to be regulated by ethylene signalling, however, the function of auxin in it is not known. Here, we identified MdIAA14b, an auxin-responsive gene, as a key regulator of apple fruit firmness. MdIAA14b showed allele-specific expression (AS...