Effect of Pinching Time and Plant Growth Retardants on Growth Control of Ardisia pusilla in an Ebb and Flow System
2011
Won, E.J., Gyeongsang National University, Jinju, Republic of Korea | Park, J.E., Gyeongsang National University, Jinju, Republic of Korea | Park, Y.G., Gyeongsang National University, Jinju, Republic of Korea | Jeong, B.R., Gyeongsang National University, Jinju, Republic of Korea
This study was conducted on the effect of plant growth retardants (PGRs) on growth of potted Ardisia pusilla and Ardisia pusilla var. variegata grown for a short term in an ebb and flow system. Plants were planted in 10 cm plastic pots, containing a mixture of peat moss and perlite (1 : 1, v/v) on 30 June 2005 and were grown until 23 Sep. 2005. The PGRs used were 50, 200, 350, 500 mgㆍL-¹ daminozide (B-9), 10, 40, 70, 100 mgㆍL-¹ paclobutrazol (Boundy), and 5, 15, 25, 35 mgㆍL-¹ ethephon (Florel). On every irrigation, the nutrient solution containing PGRs was supplied at a 2 cm depth and was kept for 15~20 minutes. The surplus nutrient solution was drained back into the tank for next irrigations. In both cultivars, paclobutrazol gave the most pronounced effect in inhibition of stretchiness. Ardisia pusilla, which was pinched just before initiation of paclobutrazol treatment, resulted in the greatest inhibition of shoot elongation. Daminozide treatments above 200 mgㆍL-¹ also gave reduction of shoot length. However, ethephon treatments gave no dwarfing effect in Ardisia pusilla. Inhibition of stretchiness was observed even in the lowest concentration treatments. Among the PGRs, paclobutrazol was the most effective in suppressing plant stretchiness.
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