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- Author or Editor: M. B. Farhoomand x
Abstract
Ethylene production of 470 ‘Hi-Early Red Delicious’ apples harvested from primary, secondary, tertiary, etc., branches of 4 uniform trees of Malus domestica Borkh. was measured to determine pattern of ripening in relation to fruit position on the tree. Considerable variation was noted between and within branches. Some fruits showed surprisingly high ethylene (about 200 ppm at 155 days and up to 500 ppm at 160 days after full bloom) while others measured less than 5 ppm. Regression analysis revealed a linear trend between primary branches from base to apex of the tree. Delayed ethylene production of fruits below terminal shoots suggests ripening regulators in shoot tissue are interacting to delay ethylene synthesis.
Abstract
Immersing stems of carnation flowers (Dianthus caryophyllus L. cv. White Sim) in solutions containing a silver thiosulfate complex prepared by combining silver nitrate with sodium thiosulfate (molar ratio 1:4) doubled their vase life (from 5 to more than 10 days). The effect could be achieved by treating stems with solutions containing as little as 1.0 mM Ag with a pulse as short as 10 minutes. Silver uptake estimations indicated that a minimum of 0.5 μmol Ag was required per stem for maximum vase life and that more than 5 μmol Ag per stem was toxic.