THE INFLUENCE OF SELECTED GROWTH REGULATORS ON DEVELOPMENT, DECORATIVE VALUE AND YIELD OF CORMS OF EASY POT FREESIA (Freesia Eckl. ex Klatt). PART II. ETHEPHON
Piotr Żurawik
West Pomeranian University of Technology in SzczecinMonika Placek
West Pomeranian University of Technology in SzczecinAbstract
Ethylene is a plant hormone which play an important role in regulation of physiological plant processes. However, use of ethylene for practical purposes is restricted by its multilateral activity. Experiments were carried out in the years 2006–2007, in summer-autumn period to evaluate the influence of concentration of ethephon solution (125, 250, 500, 1000, 2000 mg dm-3) on growth, flowering, decorative value and yield of the offspring corms of three cultivars of Easy Pot Freesia: ‘Gompey’, ‘Popey’ and ‘Suzy’ grown from cormlets. Soaking corms in ethephon solution had an effect on the delay of germination and prolongation of vegetative phase. Corms soaked in ethephon solution of the highest concentrations, i.e. 1000 and 2000 mg dm-3 did not blossom. Regardless the cultivar the use of ethephon had an effect on the decrease of number of leaves set on main shoot and greenness index of leaves but also on the increase of number of shoots. The
concentration 2000 mg dm-3 showed the strongest effect on the vegetative traits of plants. Ethephon affected also decorative value of freesia. The use of ethephon solution in concentrations of 125, 250 and 500 mg dm-3 had an effect on the decrease of length of main inflorescence shoot, and in concentrations of 125 and 250 mg dm-3 caused the increase of number of flowers in first inflorescence. Soaking corms in ethephon solution had an effect on the increase of coefficient of corm number increase but also on the decrease of coefficient of corm weight increase.
Keywords:
cultivars, morphological traits, flowering, Ethrel 480 SLReferences
Gepstein S., Thimann K.V., 1981. The role of ethylene in the senescence of oat leaves. Physiol. Plant. 68, 349–354
Halevy A.H., Shilo R., Simchon S., 1970. Effect of 2-chloroethanephosphonic acid (Ethrel) on health, dormancy and flower and corm yield gladioli. J. Hort. Sci. 45, 427–434.
Imanishi H., Berghoef J., 1986. Some factors affecting dormancy-breaking by ethylene in freesia corms. Acta Hortic. 177, 637–640.
Imanishi H., Fortainier E.J., 1983. Effects of exposing freesia corms to ethylene or to smoke on dormancy-breaking and flowering. Sc. Hort. 18, 381–389.
Imanishi H., Halevy A.H., Kofranek A.M., Han S., Reid M.S., 1994. Respiratory and carbohydrate changes during ethylene-mediated flower induction in Dutch iris. Sc. Hort. 59, 275–284.
Jankiewicz L.S., 1997. Regulatory wzrostu i rozwoju roślin. Właściwości i działanie. PWN Warszawa.
Kao C. H., Yang S. F., 1983. Role of ethylene in the senescence of detached rice leaves. Plant Physiol. 73,881–885.
Kawa-Miszczak L., Węgrzynowicz-Lesiak E., Saniewski M., 1997. Pozytywny wpływ etylenu na wzrost i rozwój ozdobnych roślin cebulowych i bulwiastych. Post. Nauk Rol. 1, 49–61.
Lee J.J., Jeong J.S., Kim J.C., 1998. Effects of high-temperature storage and ethylene on breaking dormancy of freesia corms. J. Korean Soc. Hortic. Sci. 39 (6), 789–93.
Mynett K., Startek L., Żurawik P., Płoszaj B., 2001. Wpływ Gibrescolu i Flordimexu na wschody i wzrost frezji ogrodowej. Rocz. AR Pozn. 332, Ogrodnictwo 33, 103–110.
Reid M.S., 1992. Ethylene in postharvest technology. Univ. of California, 97–108.
Shi Y.M., Tao Y.W., Qin W.Y., Fei X.N., 1997. Effects of chilling and plant growth regulators of freesia flowering. Acta Hortic. Sinica 24 (2), 185–188.
Startek L., Żurawik P., 2004. Wpływ niektórych regulatorów wzrostu na przebieg i długość faz rozwojowych frezji z grupy Easy Pot. Cz. II. Folia Univ. Agric. Stetin. Agricultura 236 (94), 201–206.
Startek L., Żurawik P., 2005. Effect of etephon on easy pot Freesia. Acta Hortic. 673 (2), 617–623.
Uemura S., Imanishi H., 1987. Changes in abscisic acid levels during dormancy release in freesia corms. Plant Growth Regul. 5, 97–103.
Żurawik P., Startek L., 2007. Wielkość i jakość plonu bulw potomnych frezji z grupy Easy Pot w zależności od stężenia etefonu. Rocz. AR Pozn. 383, Ogrodnictwo 41, 253–257.
Żurawik P., Startek L., Salachna P., 2003. Wzrost, rozwój i kwitnienie w okresie letnim odmian frezji (Freesia Eckl. ex Klatt) z grupy Easy Pot. Zesz. Prob. Post. Nauk Rol. 491, 403–410.
West Pomeranian University of Technology in Szczecin
West Pomeranian University of Technology in Szczecin
License
Articles are made available under the conditions CC BY 4.0 (until 2020 under the conditions CC BY-NC-ND 4.0).
Submission of the paper implies that it has not been published previously, that it is not under consideration for publication elsewhere.
The author signs a statement of the originality of the work, the contribution of individuals, and source of funding.
