Breaking Dormancy of Gladiolus Corms (Gladiolus hybridus) Using Plant Growth Regulators

Abstract

A long period of dormancy is one of the constraints in the supply of seed plant gladiolus. The objective of the research was to ivestigate the effect of plant growth regulators (PGR) in breaking the dormancy of gladiolus corms cv. Nabila. The experiment was used a-napthalelle acetic acid (NAA) and gibberelic acid (GA3). The concentration of NAA was O. 50, 100, an 150 ppm, while the GA3 concentrations were 0, 50 100, and 150 ppm. The randomized complete block design (RCBD) with one factor was used in the first experiment with five replications. In the second experiment the best combination of both PGR from the first experiment were selected and applied to corms with different storage periodes (0, 2. 4, 6, and 8 weeks). The RCBD with two factor and five replications was used.The results of the first experiment showed that all treatment using NAA and GA, individually accelerated the rooting and sprouting of the corms therefore indicating the dormancy breaking occurred. The results of the second experiment showed that 100 ppm NAA and 50 ppm GA gave simiilar effect in dormancy breaking of the gladiol corms. The corms directly harvested and storage for two weeks were easyly rooted and sprouted.