The xanthophyll cycle in @entity3587 ( @entity3587 . cv Kleine Rheinlanderin) plants has been investigated in vivo. Control plants were compared with those grown under intermittent light (IML plants). IML plants are particularly characterized by the absence of nearly all chlorophyll a/b-binding proteins. The rates of de-epoxidation during 30 min of illumination and their dependence on the incident @entity2101 ( @entity2101 ) have been determined. They were very similar in both types of plants, with the exception that IML plants contained, at any @entity2101 , much higher @entity7695 concentrations in the steady state (reached after about 15 min of illumination) than control plants. This indicates that the amount of convertible @entity7693 under illumination is dependent on the presence of chlorophyll a/b-binding proteins. The epoxidation rate (examined at a @entity2101 of 15 [mu]E m-2 s-1, after 15 min of preillumination with different PFDs) showed significant differences between the two types of plants. It was about 5-fold slower in IML plants. On the other hand, in both types of plants, the epoxidation rate decreased with increasing @entity2101 during preillumination. Prolonged preillumination at high PFDs resulted in a decrease of the epoxidation rate without a further increase of the @entity7695 concentration in both continuous light and IML plants. This result argues against a permanent turnover of the xanthophylls under illumination, at least at high PFDs.

The Xanthophyll Cycle in Intermittent Light-Grown XXXX Plants (Possible Functions of Chlorophyll a/b-Binding Proteins).

@entity7695 :: ('MESH:C005881', 'Chemical') :: ['zeaxanthin'] @entity7693 :: ('MESH:C005613', 'Chemical') :: ['violaxanthin'] @entity2101 :: ('MESH:C538394', 'Disease') :: ['photon flux density', 'PFD'] @entity3587 :: ('3888', 'Species') :: ['Pisum sativum L', 'pea']
@entity3587 :: (3888,Species) :: ['Pea']
