Abstract

AbstractThe stability against high intensity irradiation (red light, 700 W m−2) was investigated for the chlorophyll(ide) pigments formed after the primary photoreduction of the protochlorophyll(ide) in dark grown leaves of wheat. After photoreduction, most of the chlorophyll(ide) exists in a form with an absorption maximum at 684 nm. This form is gradually transformed into a form with an absorption maximum at 673 nm (the Shibata shift). It was possible to ascribe a specific photostability to each of the pigment forms. This photostability was higher for the 673‐form than for the 684‐form. A red‐shift in the absorption maximum following upon the Shibata shift, reflects the successive transformation of the 673‐form into other pigment forms, which were quite photostable at the intensity used.

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