AS  Vol.9 No.3 , March 2018
Paclobutrazol Applied on Cotyledonal Leaves and Quality of Cucumber, Squash, Melon and Watermelon Seedlings
The research was done to determine the effects of paclobutrazol (PBZ) through the dose of 150 mg·L-1, on the quality of seedlings determined by the content of chlorophyll, height, leaf area, dry matter of roots and of the aerial part of cucumber, squash, melon and watermelon. Sowing of all species carried out on October 21, 2013 in polystyrene trays with 200 cavities filled with peat moss. Treatments were the doses of 150 mg of PBZ·L-1 water and the control (distilled water). The solution with PBZ and the distilled water were applied only once with manual atomizer on cotyledonal leaves by mean of 25 shots made approximately with the same force, having put physical barriers between experimental units. In the four species (cucumber, squash, melon and watermelon) the PBZ increased the chlorophyll content in 26.0%, 14.9%, 19.4% and 26.5%, respectively, compared to the control; height decreased in 24.0%, 34.7%, 16.3% and 23.4%; leaf area decreased in 40.1, 0.5, 30.4 and 16.2%; the dry matter of roots increased in 20.0%, 62.5%, 85.7% and 19.7%; whereas in cucumber the dry matter of the aerial part increased 12.3%, in squash decreased 5.3%, and in melon and watermelon increased in the respective 22.9 and 3.3%, so that the 150 mg dose of PBZ can be used to produce seedlings with higher quality for transplant.
Cite this paper
Flores, L. , de Jesús Velázquez Alcaraz, T. , Ruvalcaba, L. , Valdés, T. , Tafoya, F. , Torres, N. and Juárez, M. (2018) Paclobutrazol Applied on Cotyledonal Leaves and Quality of Cucumber, Squash, Melon and Watermelon Seedlings. Agricultural Sciences, 9, 264-271. doi: 10.4236/as.2018.93020.
[1]   SIAP (2013) Cierre de la producción agrícola por cultivo.

[2]   Pallardy, S.G. (2008) Physiology of Woody Plants. 3rd Edition, Academic Press, Cambridge, 464.

[3]   Lilly, S.J. (2001) Arborists’ Certification Study Guide. International Society of Arboriculture, Champaign, 222.

[4]   Rojas, G.M. and Rovalo, M.M. (1985) Fisiología Vegetal Aplicada. McGraw-Hill, New York, 302.

[5]   Burch, P.L., Wells, R.H. and Kline, W.N. (1996) Red Maple and Silver Maple Growth Evaluated 10 Years after Application of Paclobutrazol Tree Growth Regulator. Journal of Arboriculture, 22, 61-66.

[6]   Tadao, A. Kin, M.Y., Nagata, N., Yamagishi, K., Takatsuto, S., Fujioka, S., Murofushi, N., Yamaguchi, I. and Yoshida, S. (2000) Characterization of Brassinazole, a Triazole-Type Brassinosteroid Biosynthesis Inhibitor. Plant Physiology, 123, 93-99.

[7]   Early, J.D and Martín, G.C. (1988) Translocation and Breakdown of 14C-Labelled Paclobutrazol in Nemaguard Peach Seedlings. Hort Science, 23, 196-200.

[8]   Keever, G.J., Foster, W.J. and Stephenson, J.C. (1990) Paclobutrazol Inhibits Growth of Woody Landscape Plants. Journal of Environmental Horticulture, 8, 41-47.

[9]   Singh, Z. (2000) Effects of (2RS, 3RS) Paclobutrazol on Tree Vigour, Flowering, Fruit Set and Yield in Mango. Acta Horticulturae, 525, 459-462.

[10]   George, A.P. and Nissen, R.J. (2002) Control of Tree Size and Vigor in Custard Apple (Annona spp. Hybrid) cv. African Pride in Subtropical Australia. Australian Journal of Experimental Agriculture, 42, 503-512.

[11]   Williams, D.R., Potts, B.M. and Smethurst, P.J. (2003) Promotion of Flowering in Eucalyptus nitens by Paclobutrazol Was Enhanced by Nitrogen Fertilizer. Canadian Journal of Forest Research, 33, 74-81.

[12]   Bai, S., Chaney, W. and Qi, Y. (2004) Response of Cambial and Shoot Growth in Trees Treated with Paclobutrazol. Journal of Arboriculture, 30, 137-145.

[13]   Grochowska, M.J., Hodun, M. and Mika, A. (2004) Improving Productivity of Four Fruit Species by Growth Regulators Applied Once in Ultra-Low Doses to the Collar. The Journal of Horticulture & Science Biotechnology, 79, 252-259.

[14]   Watson, G.W. (1996) Tree Root System Enchancement with Paclobutrazol. Journal of Arboriculture, 22, 211-217.

[15]   Ali, A.R. (2009) Improving Germination Performance and Chilling Tolerance in Cucumber Seedlings with Paclobutrazol. International Journal of Vegetable Science, 15, 173-184.

[16]   Partida, R.L., Velázquez, A.T.J., Díaz, V.T., Ayala, T.F. and Acosta, V.B. (2007) Paclobutrazol and Root and Shoot Growth in Bell Pepper and Eggplant Seedlings. Revista Fitotecnia Mexicana, 30, 145-150.

[17]   Berova, M. and Zlatev, Z. (2000) Physiological Response and Yield of Paclobutrazol Treated Tomato Plants (Lycopersicon esculentum Mill.). Plant Growth Regulation, 30, 117-123.

[18]   Percival, G.C. and Albalushi, A.M.S. (2007) Paclobutrazol-Induced Drought Tolerance in Containerized English and Ever-Green Oak. Arboriculture & Urban Forestry, 33, 397-409.

[19]   Martínez, T.T., Plascencia, E.F.O. and Cetina, A.V.M. (2013) Growth and Vitality of Populus alba L. with Topping and Treated with Paclobutrazol. Revista Chapingo Serie Horticultura, 19, 381-388.

[20]   Navarro, A., Sánchez, B.M.J. and Bañon, S. (2007) Influence of Paclobutrazol on Water Consumption and Plant Performance of Arbutus unedo Seedlings. Scientia Horticulturae, 111, 133-139.

[21]   Sharma, D.K., Dubey, A.K., Srivastav, M., Singh, A.K., Sairam, R.K., Pandey, R.N., Dahuja, A. and Kaur, C. (2011) Effect of Putrescine and Paclobutrazol on Growth, Physiochemical Parameters, and Nutrient Acquisition of Salt Sensitive Citrus Rootstock Karna khatta (Citrus karna Raf.) under NaCl Stress. Journal of Plant Growth Regulation, 30, 301-311.

[22]   Nizam, K. and Te-chato, S. (2009) Optimizing of Root Induction in Oil Palm Plantlets for Acclimatizacion by Some Potent Plant Growth Regulators (PGRs). Journal of Agricultural Technology, 5, 371-383.

[23]   Partida, R.L., Velázquez, A.T.J., Díaz, V.T., Ayala, T.F. and Acosta, V.B. (2012) Paclobutrazol para incrementar la producción de hortalizas y cereales. Académica Española, Saabrücken, 81 p.

[24]   Wien, H.C. (1999) Trasplanting. In: Wien, H.C., Ed., The Physiology of Vegatble Crops, CABI Publishing, Department of Fruit and Vegetable Science, Cornel University, Ithaca, 37-68.

[25]   Sánchez, del C.F., Ortiz, C.J., Mendoza, C.C., González, H.V. and Colinas, L.M.T. (1999) Morphological Traits Associated with a Tomato Ideotype for a Nonrestrictive Environment. Agrociencia, 33, 21-29.

[26]   Leskovar, D.I. (2001) Producción y ecofisiología del trasplante hortícola. Texas A & University, 24 p.

[27]   Blanco, F. and Folegatti, M. (2003) A New Method for Estimating the Leaf Area Index of Cucumber and Tomato Plants. Horticultura Brasileira, 21, 666-669.

[28]   Giovinazzo, R., Souza, M.V. and Hartz, T.K. (2001) Paclobutrazol Responses with Processing Tomato in France. Acta Horticulturae, 542, 355-358.

[29]   Velázquez, A.T.J., Partida, R.L., Acosta V.B. and Ayala T.F. (2008) Production of Tomato and Pepper Plant Applying Paclobutrazol on Foliage. Universidad y Ciencia, 24, 21-28.

[30]   Balamani, V. and Poovaiah, B.W. (1985) Retardation of Shoot Growth and Promotion of Tuber Growth of Potato Plants by Paclobutrazol. American Journal of Potato Research, 62, 363-369.

[31]   Flores, L.R., Sánchez, C.F., Rodríguez, P.J.E., Mora, A.R., Colinas, L.M.T. and Lozoya, S.H. (2011) Paclobutrazol, Uniconazole and Cycocel in Potato Seed-Tuber Production in Hydroponic Culture. Revista Chapingo Serie Horticultura, 17, 173-182.

[32]   Wood, B.W. (1988) Paclobutrazol Suppresses Vegetative Growth of Large Pecan Trees. HortScience, 23, 341-343.