Degreening and chlorophyll loss can be induced by exogenous
ethylene in parsley (Amir-Shapira et al., 1987) and spinach leaves
(Yamauchi and Watada, 1991). Similarly, other authors (Gong and
Mattheis, 2003) have found high chlorophyllase (chlase) activity
in broccoli treated with exogenous ethylene, suggesting that ethylene
is responsible for the chlorophyll loss. In addition, the same
authors found that an increase in chlase activity was inhibited
using an inhibitor of ethylene (1-methylcyclopropene). It has been
reported that brassica florets produce significant quantities of ethylene
(Pogson and Morris, 1997) in comparison to leaves. This would
suggest a greater role for ethylene in the senescence of floral parts
in comparison to leaves
Degreening and chlorophyll loss can be induced by exogenous
ethylene in parsley (Amir-Shapira et al., 1987) and spinach leaves
(Yamauchi and Watada, 1991). Similarly, other authors (Gong and
Mattheis, 2003) have found high chlorophyllase (chlase) activity
in broccoli treated with exogenous ethylene, suggesting that ethylene
is responsible for the chlorophyll loss. In addition, the same
authors found that an increase in chlase activity was inhibited
using an inhibitor of ethylene (1-methylcyclopropene). It has been
reported that brassica florets produce significant quantities of ethylene
(Pogson and Morris, 1997) in comparison to leaves. This would
suggest a greater role for ethylene in the senescence of floral parts
in comparison to leaves
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