Influence of light regime and leaf nitrogen concentration on 77K fluorescence in leaves of four tropical grasses: no evidence for photoinhibition [green panic, Panicum maximum; carpet grass, Axonopus compressus; buffalo grass, Stenotaphrum secundatum; Kiyuku, Pennisetum clandestinum].
1988
Ludlow M.M. | Wilson J.R. | Samarakoon S.P.
Four grasses (green panic, carpet grass, buffalo grass and kiyuku) were grown in full sunlight and at 37 percent of full sunlight, and given a low or high nitrogen supply. Despite differences of up to twofold in leaf nitrogen and chlorophyll concentration between high and low nitrogen treatments in all 4 grasses, photoinhibition measured by reduction in chlorophyll fluorescence was less than 37 percent in leaves of low nitrogen content that developed in full sunlight. Therefore, photoinhibition is not a contributor to the poor growth of nitrogen-limited grasses in full sunlight. Green panic plants that had been given either high or low nitrogen supply and grown in 37 percent of full sunlight were transferred to full sunlight and the extent of photoinhibition was followed over 8 days. The amount of photoinhibition that occurred was small compared with plants grown at either nitrogen level in full sunlight. Therefore, shade and low nitrogen content separately or in combination did not cause any appreciable photoinhibition in green panic.
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