Why Plastid Genomes Retained • High conc 02 may cause rapid mutation • No sexual recombination to correct mutations • But plastid mutation rate is lower than nuclear genome • Redox State Regulation of PSI, PSII • psbA regulated with PSI light • PSI genes upregulated with PSII light • Why protein synthetic machinery is maintained even in non-photosynthetic parasites?? • Must translate essential proteins: clpP, accD, suf
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