Programmed cell death in daylily (Hemerocallis hybrid) petals: Biochemical and molecular aspects

TL;DRAbstract

Possible roles for wall-based enzyme activity in aging of daylily petals are presented. We are asking if daylily senescence is controlled in part by reactions associated with. We suggest that membrane changes leading to cell death may be induced in part by lipoxygrenase activity and by ROS that are increasing because of reduced effectiveness of certain protective enzymes. The flowers are insensitive to ethylene, but exogenous ABA prematurely upregulates events that occur during natural senescence, such as loss of differential membrane permeability, increases in lipid peroxidation and the induction of proteinase and RNase activities. The possibility is discussed that ABA is a constituent of the signal transduction chain leading to programmed cell death of daylily petals. Six daylily genes, whose levels increase during senescence, were isolated from a daylily cDNA library. Southern blot analysis showed that all six DSA genes, designated as DSA3, 4, 5, 6, 12 and 15, are members of multige

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