| Disease | 15 ORGANIC ACIDS WERE EXAMINED FOR THEIR ABILITIES TO SUPPORT GROWTH AND ANTHOCYANIN ACCUMULATION BY SUSPENSION CULTURES OF WILD CARROT USING NH4+ AS THE SOLE N SOURCE.
GLUTARATE, ADIPATE, PIMELATE, AZELATE, CINNAMATE AND PHTHALATE WERE TOXIC TO THE CULTURE.
THESE ACIDS PREVENTED GROWTH AND ANTHOCYANIN ACCUMULATION AT CA. 5 MILLIMOLS IN MEDIA THAT WERE OTHERWISE ADEQUATE FOR GROWTH.
SUCCINATE, FUMARATE, MALATE, ALPHA-KETOGLUTARATE, GLUTAMATE, MALEATE, MALONATE, TARTRATE AND CITRATE ALL SUPPORTED GROWTH AND ANTHOCYANIN PRODUCTION BUT IN VARYING AMOUNTS.
THE GROWTH ACHIEVED IN MEDIUM CONTAINING 20 MILLIMOLS OF ACID WAS HIGHER AT AN INITIAL PH OF 5.5 THAN AT AN INITIAL PH OF 4.5. THE GROWTH ACHIEVED WAS DEPENDENT ON THE ORGANIC ACID USED, ITS CONCENTRATION AND THE INITIAL PH OF THE MEDIUM.
WHEN GROWTH OCCURRED, THE FINAL PH WAS HIGHER THAN THE INITIAL PH WITH MOST OF THE ACIDS. ANTHOCYANIN ACUMULATION WAS GREATEST WITH SUCCINATE AT 14-20 MILLIMOLS AT AN INITIAL PH OF 4.2 OR 4.3 AND DECLINED WHEN THE INITIAL PH WAS GREATER THAN 4.3. |