Transcription control of the 32 kDa‐QB protein of photosystem II in differentiated bundle sheath and mesophyll chloroplasts of maize

[摘要]

Bundle sheath chloroplasts of maize, a C₄ plant, lack a functional herbicide-binding site and the 32 kDa-Q_B thylakoid protein of photosystem II. Measurements of the amounts of Q_B-protein mRNA in bundle sheath and mesophyll chloroplasts by hybridization to a cloned psbA probe, and analysis of in vitro translation products of bundle sheath and mesophyll RNA show that during differentiation of maize leaf cells to bundle sheath and mesophyll, the expression of the chloroplast gene, psbA, which encodes the 32 kDa-Q_B protein, is controlled at the transcriptional level.

[学科分类] 生物化学/生物物理

[关键词] psbA gene;QB-protein;C4plant;(Mesophyll;Bundle sheath);Chloroplast;Gene expression;B;bundle sheath;DCMU;3-(3';4'-dichlorophenyl)-1;1-dimethylurea;LHC II;light-harvesting chlorophyll a;b-protein complex of photo-system II;M;mesophyll;PS;photosystem;RuBP carboxylase;ribulose-1;5-bisphosphate carboxylase