GA4+7 plus benzyladenine reduce foliar chlorosis of Lilium longiflorum.
Whitman, C. M., Heins, R. D., Moe, R., and Funnell, K. A.
Scientia Horticulturae. Volume 89, Issue 2, 22 June 2001, Pages 143-154.
2001
บทคัดย่อ
The effectiveness of two commercial formulations of gibberellin (GA) and benzyladenine (BA) for reducing foliar chlorosis on Easter lily (Lilium longiflorum) was compared. On a per litre basis, plants were sprayed with 0, 100, 200, or 400 mg (BA equivalent) of Accel (GA4+7:BA of 1:10) or Promalin (GA4+7:BA of 1:1) when the crop leaf area index (LAI) = 3. One group of plants was sprayed with 100 mg of Accel or Promalin (BA equivalent) per litre twice: once at LAI = 3 and again 3 weeks later. Plants were harvested when the largest flower bud on each plant measured 13 cm in length, stored for 0 or 3 weeks at 2.5 deg C in the dark, and then moved into a postharvest evaluation room at 21 deg C, where foliar chlorosis was monitored for 3 weeks. Senescence of some lower leaves on plants in every treatment was evident at harvest, and incidence of senescence increased during the 21 days of postharvest evaluation. Cold storage increased the number of leaves senescing during the subsequent evaluation period. Application of Promalin or Accel significantly reduced leaf senescence compared to that of untreated plants. At harvest, 21% of the leaves on untreated plants were senescent, while plants treated with Promalin or Accel averaged 3 or 9% senescent leaves, respectively. Following 7 days of postharvest evaluation, Promalin was more effective in preventing chlorosis than Accel at the 400 mg litre-1 (BA equivalent) level. Following 14 or 21 days of postharvest evaluation, Promalin was more effective than Accel for the 100 mg litre-1 2x and 400 mg litre-1 (BA equivalent) treatments. Plants in all Promalin and Accel treatments were taller than the untreated plants one week after sprays were applied. At harvest, plants sprayed with Promalin were between 6 and 14 cm taller than the untreated plants, but those treated with Accel were of the same height as the untreated plants. Neither Promalin nor Accel influenced the occurrence of malformed of aborted flowers in this study. However, cold storage significantly increased the number of plants with aborted buds and malformed flowers. Unstored plants averaged 0.16 aborted buds and 0.02 malformed flowers each while those stored for 3 weeks averaged 0.51 aborted buds and 0.18 malformed flowers each.