Effect of some plant growth regulator on some physiological and chemical characteristics on sour orange Citrus aurantium L.

Abstract

This study was conducted in the Lath house, Department of Horticulture University of Basrah during the growing season (2012) to investigate the effect of plant growth regulator (Malic hydrzied MH, Naphthalene acetic acid NAA and Salicylic acid SA) at 100ppm, on vegetative growth of young sour orange, the experiment design RCBD were adopted. This study was determine some vegetative characteristics (Plant height ,leaf number ,leaf area ,stem diameter ,fresh and dry weight of leaves, secondary branch tall), and some chemical characteristics on leaves ( soluble protein, Total soluble carbohydrates and total chlorophylls). The results were shows the Exogenous treatment with NAA at concentration of 100 mg/L caused a significant increase in plant height (94cm) which no significant effect with MH, whereas NAA had a significant effect on number of leaves(34 leafes) then SA treatment, however the diameter of stem reached 1.4 cm at NAA treatment then MH. The NAA treatment had higher significantly concentration of soluble carbohydrates, soluble protein and total chlorophylls (140.4,73.6 47.7)mg/g respectively