Effects of enhanced UVB on the growth of maize (Zea mays L.) plants were investigated by growing them under two different controlled conditions.The growth parameters such as weight of the plant,length of the stem,and length and width of the second leasf were measured for each plant.It was found that the growth of plants was reduced when treated with UVB.The fluorescene spectra of the green maize leaf induced by 337 nm were obtained consisted of four peak bands,two in the blue green region at 435 nm (F435),525nm(F525),and two in the red region at 684nm (F684),and 740 nm (F740) respectively.Ratios blue to green bands (F435/F525),blue to red bands (F435/F684),and the chlorophyll fluorescence (F684/F740) ratio were related to hte growth of maize plants and could be used as stress indicators for the health status of a plant.
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