Abscisic acid induced stomatal closure and reduced water loss of cut rose flower shoots bearing leaves. Its effect was very pronounced when these flowers were exposed to atmospheric stress conditions. Even short-term treatments (24 hr) with ABA extended the longevity of the flowers. However, in a stomata-less system (leafless flower shoots), or in leafy shoots held in darkness when all stomata were closed, ABA enhanced aging of the flowers and some biochemical processes associated with it (RNase activity and reduction in protein content).
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