الفهرس 
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Abstract
This research was conducted at the Arid Land Graduated and Research Institute (ALARI), Ain Shams university, Shubra El-kheima. Al-Qalyubia, Egypt. The research aimed to test the effect of selenium (Se) and nano-selenium (NSe) on green beans (Phaseolus vulgaris L.) to mitigate the cold temperature stress. Green bean seeds were sown late (mid-December) with low temperatures in open field (open) and under low tunnel (cover). Green bean plants were sprayed with selenium (Se) or nano-selenium (NSe) with four concentrations (0, 2, 4 and 8 ppm). Cultivating green bean under low tunnel produced the highest vegetative and yield characteristics compared to open cultivation. Spraying plants with 8 ppm NSe increased the following parameters: plant height, number of leaves, N % in leaves, yield significantly in both seasons while reduced proline concentration in leaves compared spraying with to Se. Regarding concentration effect, data showed that sparring NSe with 8 ppm increased total yield, number of leaves, plant height while reduced proline concentration in leaves compared to control.