The effects of plant growth regulators on the growth and flowering of potted Corydalis speciosa native to Korea

U.S. Shin, J.S. Lee, S.J. Song, G.U. Suh, S.Y. Kim, M.J. Jeong
Corydalis speciosa Maxim. is a biennial herb distributed across Korea, Japan, China and eastern Siberia. The yellow flowers bloom from April to June, and are arranged in racemes at the ends of the main stems and branches. Although biennial, Corydalis speciosa Maxim. has potential as an ornamental plant because the blooms are a showy yellow, and it has a long flowering period, lasting from April to June. This study was conducted to determine the efficacy of paclobutrazol (2.3, 11.5, 22.9, and 114.5 mg L‑1), daminozide (85, 425, 850, and 2550 mg L‑1) and trimethylammonium chloride (12, 59, 118, and 354 mg L‑1), as plant growth regulators on the growth and flowering of potted C. speciosa. The results showed that the growth of C. speciosa was significantly affected by paclobutrazol. The control plants attained a height of 22.9 cm, whereas in the paclobutrazol treatments of 2.3, 11.5, 22.9, and 114.5 mg L‑1, plant heights were 20.1, 16.4, 16.2, and 15.1 cm, respectively. The branch number was 8.1 in the control, and 5.4, 4.3, 2.8, and 4.1 with paclobutrazol at 2.3, 11.5, 22.9, and 114.5 mg L‑1, respectively, which produced a compact form. There were significant differences in the sizes of the flowers but not in the number of flowers. The most attractive dwarf-shaped plants were achieved with paclobutrazol applied at 11.5 mg L‑1 pot‑1.
Shin, U.S., Lee, J.S., Song, S.J., Suh, G.U., Kim, S.Y. and Jeong, M.J. (2020). The effects of plant growth regulators on the growth and flowering of potted Corydalis speciosa native to Korea. Acta Hortic. 1291, 139-144
DOI: 10.17660/ActaHortic.2020.1291.16
https://doi.org/10.17660/ActaHortic.2020.1291.16
appearance value, cultivation, inhibitor, new ornamental plant, wild flower
English

Acta Horticulturae