To maintain good visual and sensory quality. Responses to Ethylene Celery is not very sensitive to exogenous ethylene at low levels and low temperatures. Controlled or modified atmospheres offer moderate benefit to celery. CA for mixed storage or long distance transport of celery and lettuce has some commercial application. Physiological and Physical Disorders Blackheart.
Internal leaves develop a brown discoloration which eventually becomes deep black.
Although many predisposing factors may be involved, water-stress results in a calcium deficiency disorder causing cell death. Splits, primarily along the inner surface of the petioles result from boron deficiency. Symptoms of freezing injury include a watersoaked appearance on thawing and wilted leaves. Mild freezing causes pitting or short streaks in the petiole which develop a brown discoloration with additional storage. The aerenchyma tissue of the petiole becomes white, spongy or vacuolated, and appears dry.