Abstract
The effect of chilling on the ACC and MACC levels was studied in two maize inbreds: F 7 (tolerant) and Co 125 (sensitive). Seedlings at the third leaf stage were chilled at 5°C and at 65 or 100 % RH. Immediately before and during chilling the contents of ACC and MACC in the third leaf were measured. Water content, osmotic potential and the extent of injuries were also determined. Chilling of non-acclimated seedlings at 65 % RH caused a significant increase in the ACC content in both inbreds investigated. However, the ACC accumulation was higher in the sensitive inbred in comparison with the tolerant one. In acclimated seedlings a significant increase in ACC conent occurred only in the sensitive inbred. At 100 % RH no significant changes in ACC content were observed. Thus, the presented data suggest that chilling affects the ACC content mainly by interaction between the chilling-induced water deficit and direct effect of low temperature. A significant but transient accumulation of MACC appeared on the 3rd and 4th days during chilling of non-acclimated seedlings. In acclimated seedlings a significant accumulation of MACC occurred on the 5th day of chilling only in the sensitive inbred.
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