Abstract:
:Duckweed (Lemna minor L.) plants grown under high light are characterized, when compared to low light acclimated plants, by a higher xanthophyll cycle (VAZ) pool content, but also by a higher proportion of photoconvertible violaxanthin and a superior ability to synthesize VAZ pigments. When duckweed plants were transferred to a high light environment a general response was the quick adjustment of the carotenoid composition, mainly xanthophyll cycle pigments. These changes resulted from a balance between a process of continuous light-independent carotenoid degradation and a light-induced accumulation. The use of norflurazon, an inhibitor of carotenogenesis, allowed us to demonstrate that the observed light induced increase of the VAZ pool was mainly caused by de novo synthesis through carotenogenesis. The extent of light-induced carotenogenesis was proportional to the light treatment and also to the operation of the VAZ cycle since it was partly abolished by treatments leading to a low activity of the VAZ cycle, such as low light, DTT or DCMU. These results suggest that not only the light itself, but also a mechanism triggered by a factor associated with the de-epoxidation state of the VAZ cycle controls carotenogenesis at some point before phytoene formation in the terpenoid biosynthesis pathway.
journal_name
Physiol Plantjournal_title
Physiologia plantarumauthors
García-Plazaola JI,Hernández A,Artetxe U,Becerril JMdoi
10.1034/j.1399-3054.2002.1160115.xsubject
Has Abstractpub_date
2002-09-01 00:00:00pages
121-126issue
1eissn
0031-9317issn
1399-3054pii
ppl1160115journal_volume
116pub_type
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