Changes in ethylene production, respiration, and chlorophyll content were studied in senescing leaves of tobacco, sugar beet, and bean (AHA79796). During the latter half of senescence, a period characterized by a rapid rate of chlorophyll degradation, the rate of ethylene production increased. The increase seen was similar to the increase associated with the climacteric of fruits. An increase in respiration was also observed during the senescence of ethylene-treated ivy leaves (WAR88685). Abscission is an aging process leading to the digestion of abscission zone cells by cellulase. As in other aging processes, an increase in respiration has been observed in abscising flowers, fruits, and leaves (REI85045). Ripening includes flesh softening, aroma production, coloration, and changes in carbohydrate composition. An increase in respiration is the hall mark of ripening climacteric fruit. Floral senescence in numerous species is also characterized by an increase in the rate of respiration. Ethylene-induced respiration has also been described for orchids (YIP89365) and carnations (PEI89021).
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