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Figure 4
Elongation of the first internode of Datura ferox seedlings when plants were exposed to background canopies of different LAI. (A) The internodes were surrounded by water filters (open symbols) or by CuSO4 (FR-blocking) filters maintaining the R:FR constant and high over a range of canopy densities (closed symbols) as illustrated in (B). The dashed line is the extension rate of isolated seedlings with internodes covered by water filters. Exposure times were 3 days. In the bottom of the figure, the photosynthetic photon flux (PPF) intercepted per individual seedling is shown. The dotted line represents PPF intercepted by isolated plants. ((A) from Ballaré, Scopel and Sánchez 1990, reproduced with permission from the American Association for the Advancement of Science. (B) From Ballaré and Casal 2000, reproduced with permission from Elsevier Science.)
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