الفهرس 
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Abstract
This investigation was carried out at Postharvest Laboratory of Vegetable and Floriculture Department, Faculty of Agriculture, Mansoura University, Egypt, during 2014 and 2015 seasons. The aim of this study : The aim of this work was to study the influence of some growth regulators (GRs) and some edible colors each alone as a pulsing solution, as well as their interactions on the postharvest characteristics and chemical constituents of Gladiolus (Gladiolus hybridus cv. White Prosperity) cut spikes. Growth regulators pulsing and edible dyes treatments : Five growth regulator treatments were used in the pulsing stage, as, GA3 at 25ppm and kin at 5ppm with two pulsing periods (1 and 2 hours) for each plus the control (distilled water) were evaluated. Each treatment contained 45 spikes. The dyeing process was as follow, each gladiolus cut spike from the previous pulsing groups was dipped in a warm solutions (40o) from the two edible dyes (ponceau 4R and brilliant blue), under two concentrations of 3 and 6g/l for two periods (2 and 3h), plus the distilled water (as control). Holding solution : After the end of the pulsing and dyeing periods gladiolus cut spikes were held till the end of the experiment in preservative solutions as fallows; 1-Cut spikes (25 spikes) which have been dipped in distilled water without dyeing (control) from stage (B) were placed in a holding solution consisted of 10 % sucrose + 150 ppm 8-HQS + 150 ppm citric acid. 2-Cut spikes (100 spikes) which dipped in the previous dyeing solutions (stage B) by the 2nd, 3rd, 4th and 5th treatments, were held in solutions supplemented with 10 % sucrose + 150 ppm 8-HQS + 150 ppm citric acid + 0.5 g/l ponceau 4R dye as a fixed concentration. 3-Cut spikes (100 spikes) which dipped in the previous dyeing solutions (stage B) by the 6th , 7th , 8th and 9th treatments, were held in solution supplemented with 10 % sucrose + 150 ppm 8-HQS + 150 ppm citric acid + 0.5 g/l brilliant blue dye as a fixed concentration.
Data recorded : Vase life (days), change in fresh weight (%), maximum increase fresh weight (%), total water uptake (ml/flower), change in water uptake (ml/ 100 g f.w./4 days), change in water loss (ml/ 100 g f.w./4 days), change in water balance (ml/ 100 g f.w./4 days), chlorophyll a mg/g f.w., chlorophyll b mg/g f.w., total chlorophyll mg/g f.w., total sugar (mg/g dry weight) and Averages of bacterial counts (C.F.U /ml). Experimental design : Five growth regulators treatments (GRs) x nine dyes treatments = forty five treatments in the present work were arranged in a factorial experiment in complete randomized design (CRD). Each treatment had five replicates and each one had one spikes.