Abstract
Plants of the barley mutant chlorina3613, which completely lacks chlorophyll b, were investigated over their full life cycle growing in the field under natural light conditions. At various stages of the life cycle, plants were shaded for one week, and the effects of the shading on the further growth were monitored after restoration of the natural light regime. The resuts showed that chlorina3613 plants were characterized by a very low vegetative biomass as well as reproductive yield as compared to the wild type (cv. Donaria). However, when changes in the organization of the photosynthetic apparatus were induced by shading at the stage of booting, chlorina3613 could reach high levels of biomass production and yield in spite of the lack of chlorophyll b.
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