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Abstract
The present study was carried during the period from 2013 to 2015, at Ornamental Hort. Depart., Fac. agric., Cairo univ. to study the effect of gamma radiation on Spathiphyllum wallisii and Philodendron scandens plants. Effect of gamma radiation on Spathiphyllum wallisii plants at two ages (6-month-old and 3-month-old) .The plants were irradiated with 0, 0.5, 4 or 8 krad gamma ray(cesium 137). All gamma doses significantly reduced the survival %, plant height, stem diameter, formation of suckers, leaf length, leaf width and leaf area, compared with the control. Treating plants with 4 Krad gamma radiation significantly reduced the fresh and dry weights of leaves. All gamma doses increased the stem length and had insignificant effect on stem thickness, fresh and dry weights of stem. All gamma doses decreased the number and fresh weight of roots. All gamma treatments insignificantly increased the content of pigments and the 4 or 8 Krad gamma doses increased the content of carotenoids. The dose of 0.5 Krad increased the thickness of leaf blade (lamina), stomata size, stipule length and the number of vascular bundles. 2-Effect of gamma radiation on 3{u2013}month-old of Spathiphyllum plants: all gamma treatments significantly reduced survival %, The doses of 4 and 8 Krad significantly increased plant height. Suckers number / plant was insignificantly affected. Irradiation at the doses of 4 or 8 Krad increased the leaf length and leaf width. The dose of 8 Krad, gave the longest leaves, the dose of 4 Krad gave the highest value of leaf width and the dose of 0.5 Krad gave the largest leaf area. The dose of 4 Krad significantly increased the formation of leaves/ plant and leaf fresh weight