Re: Tissue Culture Pineapple
i put them vertically and they all good. i think its efefct food colors. for tc pineapples through callus induction more sensitif than shoot induction directly like bananas. so try with no food color.
part top become dark i think maybe they got browning. maybe you cut too small and tehre some bleach unclean or sterilieze too hard or too long. but my pineapple explant have not turn dark like your.