01613nas a2200145   4500008004100000245016400041210006900205300001500274490000700289520098800296653002201284100002001306700001801326856012301344       1985                        eng d00aResponse of Andropogon gerardii (poaceae ) to fire-induced high vs.low irradiance environments in tallgrass prairie: leaf structure and photosynthetic pigments0 aResponse of Andropogon gerardii poaceae to fireinduced high vslo  a1668 -16710 v723 a<p>Photosynthetic pigments and several structural characteristics were measured in leaves of Andropogon gerardii from tallgrass prairie populations in an unburned, low-irradiance site and a burned, high-irradiance site to determine if these species displayed sun/shade differences similar to those documented in forest species. Early in the growing season, leaves of A. gerardii in the low-irradiance, unburned site had significantly lower stomatal density, pore length, and conductance, as well as specific leaf mass and thickness than leaves from the high-irradiance, burned site. Moreover, the chlorophnyll a:b ratio, carotenoid content, and bundle sheath-vascular complex area were significantly lower, but chlorophyll content (mass/mass) was greater in leaves in unburned vs burned sites. These differences are consistent with sun/shade adaptations reported for forest understory plants and may contribute to the low productivity of A. gerardii in unburned tallgrass prairie</p>10atallgrass prairie1 aKnapp, Alan, K.1 aGilliam, F.S.  uhttp://lter.konza.ksu.edu/content/response-andropogon-gerardii-poaceae-fire-induced-high-vslow-irradiance-environments