EFFECT OF GA3, NAA AND LIGHT INTENSITY ON MORPHOLOGICAL, ANATOMICAL AND CHEMICAL CHARACTERISTICS OF GYPSOPHILA PLANTS

Abstract

The field work experiments were carried out during the two successive winter seasons of 2002/2003 and 2003/2004, at the Agricultural Research Station, Faculty of Agriculture, Cairo University, Giza. Egypt. This study aimed to explore the effect of different levels of light intensities (1050, 1800 and 3500 lux) and foliar application of GA3 (0, 250, 500 and 750 ppm) as well as NAA (0, 200, 400 and 600 ppm) on morphological, anatomical and the endogenous phytohormones IAA, ABA and GA3 concentrations in shoots and roots of two gypsophila species Gypsophila paniculata L. and Gypsophila e/egans Bieb. The results could be summarized as follows: 1-The best stimuli treatments to get highest plant height in G. paniculata was with the plants treated by foliar application at 250 ppm GA3, grown under 3500 Lux light intensity. In case of G. e/egans, plants treated 500 ppm GA3, grown under 3500 Lux light intensity, scored the highest plant height. 2-The best stimuli treatments for scoring high length of the first order branch in G.

paniculata was within the plants treated by 250 ppm GA 3, grown under 3500 Lux light intensity. In case of G. e/egans, this length was achieved by the treatment with 500 ppm GA3 under the same light intensity.