생장억제제를 이용한 분화 디기탈리스의 상품가치 향상

Improvement of Commercial Value of Potted Digitalis(Digitalis purpurea) by Plant Growth Retardants

To improve commercial value of pot Digitalis purpurea, paclobutrazol(1~20 mgㆍL⁻¹) and uniconazole(1~8 mgㆍL⁻¹) were sprayed on the leaves including flower buds. Both of plant growth retardants(PGRs) reduced the plant height and flower stalk length, and their dwarfing effect became larger as concentration of PGRs increased. The most proper concentration of PGRs to produce pot digitalis with adequate plant height was 1~2 mgㆍL⁻¹ in uniconazole, and 1~3 mgㆍL⁻¹ in paclobutrazol. The first flowering date was delayed by foliar sprays of two PGRs by 6 days, but the period to final flowering date was very close between control and treatments. PGRs reduced final flowering rate by 10% compared to control, and number of floret and chlorophyll content were decreased with high concentration of the PGRs. Correlation between PGRs and investing items evaluated were analyzed. Linear relationship between PGRs and plant height or flower stalk length was very high(R≥0.8). However, linear relationship between PGRs and floret number was low level(R=0.57~0.65).