ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Characteristics of petal senescence in a non-climacteric cut flower.

Jones, R.; McConchie, R.;

Acta Horticulturae Year: 1995 Issue: No. 405 Pages: 216-223 Ref: 12 ref.

1995

บทคัดย่อ

Studies on the physiology and molecular biology of cut flower petal senescence have mostly concentrated on climacteric flowers, and little is known of the pattern and control of petal senescence in non-climacteric flowers, such as tulips. Flower water uptake and FW of attached tulip cv. Silentia petals declined rapidly from 4 days after harvest, corresponding to the onset of petal wilting. Petal respiration declined rapidly within 2 days of harvest, while ethylene production remained low, indicating this cultivar was non-climacteric. Soluble protein contents also declined significantly in the first 3 days after harvest. The activity of lipoxygenase (LOX), an enzyme thought to be associated with membrane degradation, was measured in carnation cv. White Sim petals and compared with activity in Silentia petals during senescence. Activity in White Sim petals reached a peak prior to wilting, thought to be concomitant with the rise in ethylene production by the petals, and then declined. In tulip peta

ls, however, LOX activity rose significantly from harvest and also peaked prior to the onset of petal wilting (4 days after harvest). LOX activity and wilting were significantly reduced in tulip petals treated with 1 mM cycloheximide, indicating that LOX activity was dependent on protein synthesis. The data suggest that despite the lack of a respiratory climacteric and ethylene production, petal wilting in tulips is also associated with a rapid increase in de novo synthesis of LOX.