Effect of tryptophan and methionine on growth, flowering, bulb productivity and chemical constituents of polianthes tuberosa l. Plant

الملخص EN

Polyanthus tuberose I.

plants were treated with tryptophan and methionine at different rates during 2006 / 2007and 2007 / 2008 seasons in Orman Botanical Garden , Giza, Egypt, in order to improve the production of Polyanthus tuberosa flower and bulbs of high quality and yields by soaking the bulbs pre-planting or as a foliar spray on vegetative growth in two amino acids (tryptophan and methionine) at the rates 0.0 ,50 and lOOppm.

The results showed that using methionine as soaking or spraying at 50ppm significantly increased vegetative growth height and the time required from planting to flowering in both seasons.

Spraying tryptophan at the rate of 50ppm significantly increased leaf area, spike stem length, spike stem diameter, fresh and dry weights of spike, chlorophyll a and b and carotenoids contents.

Meanwhile, tryptophan at the rate of l00 ppm as spray significantly increased the number of leaves , number of flowers / spike, circumference of bulb, fresh and dry weights of bulb ,number of bulblets / plot, fresh and dry weights of bulblets, and both N percentage , and protein percentage in two seasons.

Therefore, it can be recommended to use amino acids (tryptophan) as a foliar sprayed to induce more growth, flowering, bulb productivity and chemical composition.