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Treatment with 1-MCP followed by ethylene showed abscission similar to the control plants in cultivar 'Calypso'; however showed some efficacy for the cultivar 'MG 302', showing a durability of 6 days (Figure 1A, Figure 1B, Figure 2C and Figure 3C).
In both cultivars, treatment with STS + Ethylene caused symptoms of phytotoxicity on the plants, showing senescence and abscission on 'Calypso' (Figure 1A and Figure 2E) and senescence and wilting on 'MG 302' (Figure 1B and Figure 3E).
Thus, pepper plants treated with 1-MCP before being exposed to ethylene, blocked the receptor sites preventing ethylene action, and subsequent yellowing and leaf abscission. The 1-MCP treatment also prevented onset of ripening of guavas, delaying the loss of fruit firmness and kept green skin color (CERQUEIRA et al., 2009).
Exposure of cultivar 'Calypso' to 10[micro]L [L.sup.-1] ethylene for 48 hours induced abscission of 100% of leaves during treatment, but did not induce any fruit abscission (data not shown).
Abscission of flowers and pods differed among cultivars.
The high positive correlation between flowers and harvestable pods confirms the low rate of abscission of these important structures, which determine agronomic yield in mungbean.