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The key enzyme activities in chlorophyll synthesis and stress resistance. (A) The enzyme activities of ALA dehydrogenase (ALAD), porphobilinogen deaminase (PBGD), coproporphyrinogen III oxidase (CPOX), and protoporphyrinogen IX oxidase (PPOX); (B) the enzyme activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX).
