Abstract
Spraying Chinese cabbage seedlings [Brassica pekinensis (Lour.) Rupr.] with the growth retardant daminozide (succinic acid-2,2-dimethylhydrazide) reduced tipburn of the mature plants. As the concentration of daminozide increased, the reduction in tipburn damage was correlated with increased calcium content in young susceptible leaves. This effect was much more pronounced in plants that were misted once a day during the head formation period.
Incubation of detached Chinese cabbage leaves for 48 h (in the dark) in solutions which contained either EDTA or EGTA caused characteristic lesions at the leaf tips. The extent of the damage was reduced by including CaCl2 in the solutions. Leaves which were incubated in a solution of EDTA+GA3 or EGTA+GA3 were severely affected, with the latter solution being the more harmful. GA3 alone did not enhance tipburn. CaCl2 greatly reduced the effect of a complex of chelating agents and GA3. Leaves derived from daminozide-treated plants which were incubated in EDTA+GA3 were less affected with tipburn lesions than leaves of control plants treated with the same solutions. When detached leaves were water-stressed for 24 h prior to incubation in these solutions, the severity of tipburn symptoms increased. The possible interactions between GA, calcium chelation and tipburn development are discussed.
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Contribution no. 1171-E, 1984 series, from the ARO, The Volcani Center Bet Dagan, Israel.
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Aloni, B., Pashkar, T. & Libel, R. The possible involvement of gibberellins and calcium in tipburn of Chinese cabbage: Study of intact plants and detached leaves. Plant Growth Regul 4, 3–11 (1986). https://doi.org/10.1007/BF00025344
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DOI: https://doi.org/10.1007/BF00025344