Low-intensity two-step absorption of chlorophyll A in vivo.
The intensity-dependent transmission of primary leaves of Triticum aestivum seedlings at lambda = 694 nm was measured with single pulses of a Q-switch ruby laser. At photon flux densities above 2 x 10(17) cm-2s-1 a decrease of transmission was observed. The result is interpreted as a two-step absorption of cooperative units of 10(5)-10(6) chlorophyll molecules.
D002734:Chlorophyll; D008027:Light; D010777:Photochemistry; D010944:Plants; D013053:Spectrophotometry
D002734:Chlorophyll