Depletion of the stratospheric ozone layer causes and increases in solar ultraviolet-B (UV-B, 280~320 nm) radiation reaching the earths surface. Enhanced UV-B radiation will have adverse effect’s on biological processes, owing to its high energy level[1]. The impacts of UV-B radiation on growth, development and metabolism of plants have been studied widely. Morphogenetic changes are concerned in effects of enhanced UV-B radiation in several plants, such as inhibition of tomato seedling hypocotyl, shorten internodes of wheat and reduction in the plant height. UV-B induced growth inhibition of plants might concern cell elongation and cell division[2]. Since cell elongation is regulated by changing in the mechanical properties of cell walls, which can be attributed to modification of the chemical properties of the cell wall polysaccharides. It is expected that the modification of structure and metabolism of their cell wall compositions are involved in UV-B induced growth inhibition in plants. Morphological responses to UV-B radiation have been investigated extensively. However, little is known about the relationship between growth inhibition and the changes in the mechanical properties of cell walls. Depletion of the stratospheric ozone layer causes and increases in solar ultraviolet-B (UV-B, 280-320 nm) radiation reaching the earths surface. Enhanced UV-B radiation will have adverse effect on biological processes, owing to its high energy level [ 1]. The impacts of UV-B radiation on growth, development and metabolism of plants have been studied widely. Morphogenetic changes are concerned in effects of enhanced UV-B radiation in several plants, such as inhibition of tomato seedling hypocotyl, shorten internodes of wheat and reduction in the plant height. UV-B induced growth inhibition of plants might concern cell elongation and cell division [2]. Since cell elongation is regulated by changing in the mechanical properties of cell walls, which can be attributed to modification of the chemical properties of the cell wall polysaccharides. It is expected that the modification of structure and metabolism of their cell wall compositions are involved in UV-B induced growth inhibition in pla nts. Morphological responses to UV-B radiation have been investigated extensively. However, little is known about the relationship between growth inhibition and the changes in the mechanical properties of cell walls.