Calcium regulation of senescence in rose petals

Citation
S. Torre et al., Calcium regulation of senescence in rose petals, PHYSL PLANT, 107(2), 1999, pp. 214-219
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
PHYSIOLOGIA PLANTARUM
ISSN journal
0031-9317 → ACNP
Volume
107
Issue
2
Year of publication
1999
Pages
214 - 219
Database
ISI
SICI code
0031-9317(199910)107:2<214:CROSIR>2.0.ZU;2-H
Abstract
Rose plants grown at high relative humidity (RH) produce flowers with a sho rter vase life than those grown at low RH. The calcium content of the forme r is lower than that of the latter. The present study was conducted to exam ine the possible involvement of calcium in the regulation of pose flower se nescence. In whole cut flowers and in detached petals of cvs Mercedes and B aroness, CaCl2 treatment promoted bud-opening and delayed senescence, The t reated flowers stayed turgid and continued their initial postharvest growth for longer periods of time, The membrane protein content in detached petal s decreased with time, in parallel to the decline in membrane phospholipids (PLs), Calcium treatment delayed the decrease in both membrane proteins an d PL and increased ATPase activity in the aging petals, Electrolyte leakage , which is a reliable indicator of petal-membrane senescence, was post-phon ed in calcium-treated flowers, Calcium treatments also suppressed ethylene production with age, We suggest that the calcium-induced delay in rose peta l senescence involves the protection of membrane proteins and PLs from degr adation, thus preserving the integrity of the membranes, reducing ethylene production, and hence maintaining solute transport and tissue vitality.