Flower abscission in potted Plectranthus.

摘要: x All eight varieties were exposed to different concentrations of ethylene (0, 0.1, 0.25 0.5, 1 and 2 μll) determine their level sensitivity. the Plectranthus determined be extremely sensitive ethylene. With 100% flower abscission occurring within 24 h at μll in all varieties. In order what internal changes causing this increase under these conditions, expression key biosynthetic enzymes, cytokinin content carbohydrates flowers examined. ACS ACO are two enzymes pathway (JOHNSON & ECKER, 1998). Changes levels mRNAs coding for examined when plants packaged put into dark. general there was an upregulation turn may have increased production by simulated transport conditions. However, not large enough solely responsible observed The 43 cytokinins measured pedicle tissue from which had been kept dark 0, 24, 48, 72 96 h. Of 21 below detection. Concentrations remaining 22 each time points it found that DHZ-type remained stable during continuous monitoring period, with most tZ iP types. Peaks often followed abscission, indicating one factors transport-induced