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Plant and Cell Physiology, 1977, Vol. 18, No. 2 477-480
© 1977

Short communication

An efficient excitation energy transfer from a carotenoid, siphonaxanthin to chlorophyll a observed in a deep-water species of chlorophycean seaweed1

Akemi Kageyama2, Yasutsugu Yokohama2, Sooji Shimura3 and Tomoyoshi Ikawa3

2Shimoda Marine Research Center, The University of Tsukuba Shimoda, Shizuoka 415, Japan
3Institute of Biological Sciences, The University of Tsukuba Sakura, Ibaraki 300-31, Japan

Excitation spectra of chlorophyll a fluorescence and absorption spectra of the thalli of Ulva japonica and Ulva pertusa were studied at room temperature. Both the fluorescence excitation spectrum and absorption spectrum of the former showed a characteristic broad peak at 540 nm, which those of the latter lacked. It was inferred that siphonaxanthin in the former efficiently transferred its excitation energy to chlorophyll a.

1 Contributions from the Shimoda Marine Research Center, No. 312.

(Received August 30, 1976; )
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