Delayed fluorescence spectra of intact leaves photoexcited by sunlight measured with a multichannel Fourier-transform chemiluminescence spectrometer

• Published in: Chemical physics letters Vol. 574; pp. 120 - 123
• Main Authors: Akita, Saeka, Yano, Ayako, Ishii, Hiroshi, Satoh, Chikahiro, Akai, Nobuyuki, Nakata, Munetaka
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 14.06.2013
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2013.04.062

•Delayed fluorescence spectra of intact leaves of Green pak choi were measured.•A new multichannel Fourier-transform chemiluminescence spectrometer was used.•The spectra were deconvoluted into two bands due to fluorescence of PS II and PS I.•The wavelength of fluorescence maximum from PS I was determined to be 748nm. Delayed fluorescence spectra of intact leaves of Green pak choi (Brassica rapa var. chinensis) were measured with a multichannel Fourier-transform chemiluminescence spectrometer, which we developed recently. The intact samples, photoexcited by sunlight without artificial light sources, showed delayed fluorescence around 740nm with a lifetime of ∼6s. The observed spectra were deconvoluted into two Gaussian bands: the delayed fluorescence from photosystem II and photosystem I complexes. Their relative intensities depended on the chlorophyll concentration, but their wavelengths were unchanged.