A Mutant of Arabidopsis thaliana that Exhibits Chlorosis in Air but Not in Atmospheres Enriched in CO21
AUTOR(ES)
Artus, Nancy N.
RESUMO
A mutant of Arabidopsis thaliana (L.) Heynh. which requires a high concentration (2% by volume) of atmospheric CO2 for growth has been isolated. Unlike previous mutants of this type, this line does not have any apparent defect in photosynthetic CO2-fixation, photorespiration, or photosynthetic electron transport. The mutant is abnormally susceptible to pigment bleaching in air but not in 2% CO2. The presence of normal or above-normal levels of antioxidants, carotenoids, and enzymes involved in reactive oxygen detoxification suggests that the mutant is equipped to detoxify activated oxygen species. Although it was not possible to establish a biochemical basis for the lesion, the properties of the mutant suggest the existence of a previously unidentified role for CO2.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1054703Documentos Relacionados
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