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Oxygen affects energy state in seeds. Siliques (30 DAF) were exposed to 0%, 4%, 12%, 21%, 30%, and 60% (v/v) O2 for 2 h, then rapidly frozen in liquid N2, and the seeds were separated from the silique wall under liquid N2 to analyze nucleotide levels: A, ATP; B, ADP; C, ATP to ADP ratio; D, UTP; E, UDP; and F, UTP to UDP ratio. Data are means ± se (n = 6 separate siliques from different plants). Error bars are not shown when they are smaller than the symbol.
