Impact of Salicylic Acid and Paclobutrazol Exogenous Application on the Growth, Yield and Nodule Formation of Common Bean

Abstract

Paclobutrazol (PP) at 10, 20 ppm and salicylic acid (SA)at 10 , 10 M were applied as -2 -3 foliar spray to 30 and 45 day-old common bean (Phaseolus vulgaris L.) plants during March to June 2006 in the greenhouse of Agric. Botany Dept. in Fac. of Agriculture of Ain Shams Univ. at Cairo, Egypt. SA considerably increased plant height when applied at 10 M. In contrast, paclobutrazol -2 significantly reduced plant height and shoot dry weight. The highest values of shoot dry weight were obtained by SA treatments. The maximum number of nodules per plant was achieved by the 333 application of SA at 10 M. Whereas PP applications prevent nodule formation. The highest -3 333 chlorophyll content was found with PP at 10 and 20 ppm. Significant increase in total protein in 333 leaves was obtained with PP at 10 and 20 ppm followed by SA at 10 M. However the highest -3 value of total protein in nodules was recorded with SA at 10 M then SA at 10 M. The present -2 -3 333 study is conducted to investigate the effect of exogenous application of SA and PP to find out whether both growth regulators had positively or negatively effect on growth, nodulation, chlorophyll, protein and yield of bean plant.