IMPROVEMENT OF SNAP BEAN (Phaseolus vulgaris L.) TOLERANCE TO SOIL SALINITY USING GAMMA IRRADIATION, HUMIC ACID AND SODIUM NITRO PRUSSIDE

Abstract

This experiment was comied out in the experimental forum of the National Center for Radiation Research and Technology –Naser city. Cairo- Egypt, during the two successive seasons of 2015/2016.Plants were sown in plastic pots(23cm of diameter). Seeds of snap bean cv.poulista were irradiated with 0,20 and 40 Gy of gamma irradiation from Cesium 137 at the dose rate of 28.5 Gy/h and 27.9 Gy/ h in both seasons respectively. While plants were sprayed with 0,4 and 8/Lof humic acid ,0,03 and 0.06g/l of sodium nitro preside under (non saline soil,500, 1000 and 2000 ppm).The mixter of soil salinity was composed from sodium chloride, calcium chloride and magnesium sulfate at the rate of 2:2:1.The foliar application was comied out at the age of 21 days after planting and was replicated every week for 5 times. It was found that soil salinity specially 1000 and 2000ppm decrease plant height, leaf number and an increase in Total sugars and total phenols. Whil both non saline conditions (control) followed by 500ppmof soil salinity scered the highest concentration of chlorophyll, pod length, podnumber per plant, potasseim, calcium and magnesium percentage in shoots.