EFFECT OF GA3, NAA AND LIGHT INTENSITY ON MORPHOLOGICAL, ANATOMICAL AND CHEMICAL CHARACTERISTICS OF GYPSOPHILA PLANTS. 11- Morphological and anatomical traits.

The field work experiments were carried out during the two successive winter
seasons of 200212003 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 applications of
GAJ (0, 250, 500 and 750 ppm) as well as NAA (0, 200, 400 and 600 ppm) on
morphological and anatomical characters of shoots and roots of two Gypsophi/a
species; G.panicu/ata and G.e/egans. Results on morphological and productive
characters indicated that, the best stimuli combination to get highest plant height in
G.panicu/ata was with the plants treated by foliar application at 250 ppm GA3, grown
under 3500 Lux light intensity, and at 500 ppm GAJ under the same Lux In case of
G.e/egans. While, in case of using NAA as foliar application, the 200 ppm under 1800
Lux light intensity caused an increase the plant height of G.panicu/ata. In G.e/egans,
the ~OO ppm NAA under 3500 Lux represented the same result. It was also found that,
the best stimuli combination for scoring the highest average number of first order
branches/plant in G.panicu/ata was 250 ppm GA3, grown under 3500 Lux light
intensity. In case of G.e/egans, it was 400 ppm NAA grown und ~r 1800 Lux. Plants of
G.panicu/ata treated with 250 ppm GA3 under 3500 Lux light intensity and plants of
G.e/egans with 500 ppm GA3 under 1800 Lux exhibited the greatest number of simple
inflorescences/plant compared with the other treatments. Both NAA concentrations;
200 ppm with 1050 Lux and 400 ppm with 1800 Lux caused the same result
mentioned above with G.paniculata and G.elefjcns, respectively.
Plants of G.panicu/ata, exposed to the 3500 Lux light intensity, exhibited full
blooming at 20 and 35.5 days earlier than those subjected to the other two light
intensities (1800 and 1050 Lux). Plants of G.e/egans, exposed to the same light
intensity, substantiated full blooming at 16 and 31 days earlier than those subjected to
the other two light intensities. Moreover, these plants treated by GA3 at 250 ppm and
200 ppm NAA under 3500 Lux showed the earliest full blooming among the other
treatments.
In both species, the anatomical studied proved that, plants adapted to NAA
applications under 3500 Lux light intensity exhibited an increase of all the diameter
measurements of root, stem and leaf. These increments due to an increase of all root,
stem and leaf internal tissues. On the contrary, GA3 treatments with 3500 Lux light
intensity produced narrow xylem vessels of root and stem. As well as these
treatments caused an increase of root diameter and decrease in stem one and leaf
blade measurements.