Chlorophyll a fluorescence of perennial ryegrass (Lolium perenne L.) varieties under long term exposure to shade

摘要: The perennial ryegrass is the species widely used in Europe as forage well for creating lawns urban areas. Unfavourable light conditions cities are principal reason of improper growth and functioning grass communities. aim our work was to answer following questions: what adaptive ability photosynthetic apparatus varieties long-term reduction solar radiation which tested has best properties be grassland establishment under reduced conditions. A two-factor experiment conducted with three shading variants. Measurements chlorophyll a fluorescence were provided, basic assessed parameters were: minimal (F 0 ), maximal m variable v ) efficiency photosystem II /F ). Gas exchange also measured. We explored differences between selected terms their adaptation During May, all characterized by increase levels light. most significant changes noticed variety ‘Taya’. months, trend decline observed this variety. For CO 2 noted. stomatal conductance not affected shading. On basis results, we have assumed that each unique threshold values demand