๐”– Bobbio Scriptorium
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Photoinhibition of photosynthesis: effect of O2and selective excitation of the photosystems in intactLemna gibbaplants

โœ Scribed by Rekha Chaturvedi; Stein Nilsen

Publisher
Springer
Year
1987
Tongue
English
Weight
478 KB
Volume
12
Category
Article
ISSN
0166-8595

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โœฆ Synopsis

Intact Lemna gibba plants were photoinhibited under anaerobic conditions on illumination with monochromatic light which selectively excited the photosystems. Photoinhibition was less when PS 1 was excited and greatest when mainly PS 2 was excited, which suggests that PS 2 was most damaged by photoinhibition induced in complete absence of 0 2 and CO:.

The illumination of plants with monochromatic light exciting PS 1, at different 0 2 concentrations (in CO 2 deficient conditions), showed that PS 1 photoinhibition was increased at the low 0 2 concentrations. The damage to PS 1 was more evident at 2% 0 2 than at the higher 0 2 concentrations.

CO 2 as well as 0 2 at atmospheric concentration, (air), was necessary for complete protection of the plant from photoinhibition when both photosystems were excited either separately or together.

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