A nucleus‐encoded factor, CRR2, is essential for the expression of chloroplast <i>ndhB</i> in <i>Arabidopsis</i>

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<jats:title>Summary</jats:title><jats:p>The chloroplast NDH complex, NAD(P)H dehydrogenase, reduces the plastoquinone pool non‐photochemically and is involved in cyclic electron flow around photosystem I (PSI). A transient increase in chlorophyll fluorescence after turning off actinic light is a result of NDH activity. We focused on this subtle change in chlorophyll fluorescence to isolate nuclear mutants affected in chloroplast NDH activity in <jats:italic>Arabidopsis</jats:italic> by using chlorophyll fluorescence imaging. <jats:italic>crr2‐1</jats:italic> and <jats:italic>crr2‐2</jats:italic> (<jats:italic><jats:styled-content>c</jats:styled-content>hloro<jats:styled-content>r</jats:styled-content>espiratory <jats:styled-content>r</jats:styled-content>eduction</jats:italic>) are recessive mutant alleles in which accumulation of the NDH complex is impaired. Except for the defect in NDH activity, photosynthetic electron transport was unaffected. <jats:italic>CRR2</jats:italic> encodes a member of the plant combinatorial and modular protein (PCMP) family consisting of more than 200 genes in <jats:italic>Arabidopsis</jats:italic>. CRR2 functions in the intergenic processing of chloroplast RNA between <jats:italic>rps7</jats:italic> and <jats:italic>ndhB</jats:italic>, which is possibly essential for <jats:italic>ndhB</jats:italic> translation. We have determined the function of a PCMP family member, indicating that the family is closely related to pentatrico‐peptide PPR proteins involved in the maturation steps of organellar RNA.</jats:p>

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