A comparative analysis of transgenic pineapple lines transformed with a polyphenol oxidase (PPO) gene
(ppo) and the untransformed cultivar ‘Smooth Cayenne’ was made from plants grown in a series of field
trials under cool subtropical conditions in southeast Queensland.
In the four field trials where blackheart
was recorded, all of the control lines expressed blackheart on each occasion and exhibited the greatest
incidence (50%) and severity (34%) of symptoms.