ارزیابی طیفهای مختلف نور بر بهره وری آب رنگیزه های فتوسنتزی و برخی خصوصیات مورفولوژیک گندم در مراحل اولیه رشد در شرایط تنش خشکی.

To investigate the effects of drought stress and different LED lights on yield, water productivity and some morphologic characteristics of wheat plant in early stages of growth, a factorial experiment was performed in the form of a completely randomized design in 2022 in the research greenhouse Torbat-e Jam University. The effects of drought stress included three levels (100, 75 and 50 percent of water requirements) and the effect of different LED lights including six levels (white, 70% red + 30% blue, 100% red, 70% blue + 30% red, 100% blue and 50% red + 50% blue) on wheat plant in the early stages of growth were investigated. The results of this research showed that by applying drought stress to the amount of 75 and 50% of the water requirement of the plant, fresh weight of aerial parts, dry weight of aerial parts, root fresh weight, root dry weight, plant length, chlorophyll a, chlorophyll b, total chlorophyll, carotenoids, potassium concentration, Phosphorus concentration and magnesium concentration decreased and water productivity increased by 18/52% and 27/94% respectively. Also, the results showed that among the different types of LED light application, the highest amount in fresh and dry weight of aerial parts, fresh and dry weight of roots, plant length and water productivity in 70% red + 30% blue light and the highest amount of pigments photosynthetic parameters were obtained in wheat plant in 50% red + 50% blue light. the results showed that the highest concentration of potassium occurred in 100% red light, phosphorus concentration in white light and magnesium concentration in 50% red + 50% blue light. Results demonstrated that the combination of 70% red light with 30% blue light increased water productivity and morphologic characteristics of wheat plant. [ABSTRACT FROM AUTHOR]