Effects of paclobutrazol and A-Rest on growth, flowering, leaf carbohydrate and leaf senescence in ‘Nellie White’ Easter lily (Lilium longiflorum Thunb.)

Growth Regulators Delay Foliar Chlorosis of Easter Lily Leaves

“…This, is turn, suggests that the postproduction development of foliar chlorosis in Easter lily leaves may be associated with the carbohydrate status of the leaves. Other researchers have proposed a similar theory for the cause of foliar chlorosis based on the various cultural practices followed in the greenhouse (Jiao et al, 1986, Miller, 1992Miller et al, 1993). Application of triazole and close spacing of plants during greenhouse production results in lower leaf carbohydrates as well as a higher percentage of leaf yellowing.…”

Ancymidol Drenches, Reversed Greenhouse Temperatures, Postgreenhouse Cold Storage, and Hormone Sprays Affect Postharvest Leaf Chlorosis in Easter Lily

“…The differences in the rate of leaf chlorosis in experiments conducted in different years under similar conditions indicate that factors other than the ones investigated may also have been involved in this leaf senescence disorder. A long-standing observation is that the growth regulator ancymidol promotes leaf chlorosis (Jiao et al, 1986;Prince and Cunningham, 1989;Tsujita et al, 1978Tsujita et al, , 1979. In this study, we investigated how growth retardants interact with postharvest cold-storage-treated plants.…”

“…In this study, we investigated how growth retardants interact with postharvest cold-storage-treated plants. Jiao et al (1986) showed that ancymidol treatment resulted in low carbohydrate levels in leaves indicating reduced vigor. Reduced plant vigor from chemical growth regulator treatment may increase plant vulnerability to leaf chlorosis induced by cold storage.…”

“…A "gradual" type of leaf yellowing, which occurs during greenhouse production, and an extremely rapid postharvest syndrome, termed "catastrophic" leaf yellowing have been described (Miller, 1991). Cultural factors such as the use of high levels of growth retardants, low phosphorus nutrition and root rot diseases can induce gradual leaf chlorosis in Easter lilies grown in greenhouses (Jiao et al, 1986, Tsujita et al, 1978, 1979. Postproduction leaf chlorosis can be induced by both preharvest factors such as high doses of growth retardants and early termination of fertilization (Prince and Cunningham, 1989), and postproduction factors such as cold storage before marketing, and shipping stress (Prince et al, 1987).…”

“…Postproduction leaf chlorosis can be induced by both preharvest factors such as high doses of growth retardants and early termination of fertilization (Prince and Cunningham, 1989), and postproduction factors such as cold storage before marketing, and shipping stress (Prince et al, 1987). However, the interactions of preharvest factors with (Miller et al, 1993), or treated with ancymidol (Bailey and Miller, 1989;Jiao et al, 1986). It may be hypothesized that depletion of carbohydrate and N reserves is related to the degree of postharvest leaf chlorosis in Easter lilies.…”