The effect of paclobutrazol treatment on root carbohydrate, macronutrient contents and fine root growth of rejuvenated coffee (Coffea arabica l.)

Thirty year old non-productive coffee (Coffea arabica L.) trees were treated with three levels of paclobutrazol (0 control, 0.5 g a.i and 1.0 g.a.i. PBZ /meter canopy span) using Cultar 1 and 2 months before rejuvenation pruning and the effects on root carbohydrate, macronutrient contents and fine root growth were assessed. Application of 1.0 g a.i. PBZ significantly increased root starch content but did not affect the root sugar content. Plants applied with PBZ 2 months prior to pruning had higher root P content compared to those applied 1 month prior to pruning. Root N, P, K, Ca and Mg contents did not differ with time of PBZ treatment. The timing of PBZ application had no significant effect on the root volume and dry weight but PBZ concentration significantly affected root volume with plants applied with 0.5 g a.i. PBZ per meter canopy span having 40% bigger fine roots volume relative to the non-PBZ treated control.

Keywords:

rejuvenation pruning, Paclobutrazol, fine roots macro nutrients,

PDF

___

BRAGANÇA, S.M. 2005. Crescimento e acúmulo de nutrientespelocafeeiroconilon (CoffeacanephoraPierre).Viçosa, Universidade Federal de Viçosa.Ph.D. thesis.
CABANGBANG, R. P. 1990. Coffee Rejuvenation in the Philippines. Technol. J.12(3):1-16.
CANNELL, M.G. 1971a. Effects of fruiting, defoliation and ring barking on the accumulation and distribution of dry matter in branches of Coffea arabica L. Kenya Exp. Agric. 7:53-74.
CHANEY, W.R. 2005. Growth retardants: A promising tool for managing urban trees. Purdue University Extension. FNR-252-
W.DAVIS, T.D., STEFFENS,G.L. and N. SANKLA. 1985. Triazole plant growth regulators. Hort. Rev. 10:63-105.HUA S., ZHANG. Y., YU. H., LIN, B., DING. H., ZHANG. D., REN. Y., and Z. FANG. 2014. Paclobutrazol application effects on plant height, seed yield and carbohydrate metabolism in canola. Int. J. Agric. Biol.16:471-479.JACOBSEN, J.V., GUBLER, F. and P.M. CHANDLER. 1995. Giberellinaction in germinated cerealgrains. In: Plant Hormones – Physiology, Biochemistry and Molecular Biology.Dordrecht, The Netherlands: Kluwer Academic Publishers. Pp. 246-271.NUTMAN, F.J. 1933. The root system of Coffea arabica L. I. Root systems in typical soils of British East Africa. Empire J.Expl. Agric. 1:271-284. PERSON,H.A.1983. The distribution and productivity of fine roots in boreal forest. Plant and Soil 71:87-101
RAMOS, A.D. AND A.L. ACEDO, JR. 2013. Morphological effects of paclobutrazol on the re-growth of rejuvenated coffee (Coffea arabica L.) trees. Science and Humanities Journal.10:36-53.
SADEGHI-SHOAE, M.,DAVOOD, H.; TALEGHANI, D.F., PAKNEJAD, F. and A. KASHANI. 2014. Evaluation of the effect of paclobutrazol on bolting, qualitative and quantitative performance in autumn sown sugar beet genotypes in Moghan region. Int’l Jour. of Bioscience. 5(1):345-354.
STEFFENS, G.L., BYUN, J.K. and S.Y. WANG. 1985. Controlling plant growth via the gibberellin biosynthesis system I: Growth parameter alteration in apple seedlings. Physiol. Plant. 63: 163-168
SWIETLIK, D and S. S MILLER. 1983. The effect of paclobutrazol on growth and response to water stress in apple seedlings. J. Amer. Hotic. Sci. 108: 1076-1080
SYMONS, P.R., HOFTMAN,P.Y., and B.N. WOLSTENHOLME. 1990. Responses to paclobutrazol of potted “Hass” avocado trees. Acta Hort. 275, 193-198.
UPADHYAYA, A.,. DAVIS, T.D., WALSER, R.H., GALBIATH A.B., and N. SANKHLA. 1986. Uniconazole-induced alleviation of low temperature damage in relation to antioxidant activity. Hort Science 24:955-957.
WANG, S.Y., BYUN, J.K. and G.L. STEFFENS.1985. Controlling plant growth rate via the gibberellin biosynthesis II: Biochemical and physiological alterations in apple seedlings. Plant Physiol. 82:11-14.
WANG, S.Y., STEFFENS, G.L. and M. FAUST.1986. Effect of paclobutrazol on accumulation of carbohydrates in apple wood. Hortic. Sci. 21(6):1419-1421.
WATSON.G.W. 1986.Tree root system enhancement with Paclobutrazol.Jour. Arboriculture 22(5):211-216
WATSON, G.W. and E.B. HIMELICK.. 2004. Effects of soil pH, root density, and tree growth regulator on pin oak chlorosis. J Arboriculture. 30:172-177..
WOODS, W.B. 1988. Paclobutrazol suppresses vegetative growth of pecan trees. Hortic. Sci. 23:341-343.
YESHITELA, T.B. 2004. Paclobutrazol suppressed vegetative growth and improved yield as well as fruit quality of ‘Tommy Atkins’ mango (Mangiferaindica L) in Ethiopia. New Zealand J. Crop and Hort. Sci. 32(3):281-293.
YIM, K.O., UWON, Y.W. and D.E. BAYER.1997. Growth responses and allocation of assimilates in rice seedlings by paclobutrazol and gibberellin treatment. J.Plant Growth Regul. 16: 35-41.