Embryo defective 14 encodes a plastid-targeted cGTPase essential for embryogenesis in maize

The Plant Journal : for Cell and Molecular Biology
Cuiling LiBao-Cai Tan

Abstract

The embryo defective (emb) mutants in maize genetically define a unique class of loci that is required for embryogenesis but not endosperm development, allowing dissection of two developmental processes of seed formation. Through characterization of the emb14 mutant, we report here that Emb14 gene encodes a circular permuted, YqeH class GTPase protein that likely functions in 30S ribosome formation in plastids. Loss of Emb14 function in the null mutant arrests embryogenesis at the early transition stage. Emb14 was cloned by transposon tagging and was confirmed by analysis of four alleles. Subcellular localization indicated that the EMB14 is targeted to chloroplasts. Recombinant EMB14 is shown to hydrolyze GTP in vitro (Km  = 2.42 ± 0.3 μm). Emb14 was constitutively expressed in all tissues examined and high level of expression was found in transition stage embryos. Comparison of emb14 and WT indicated that loss of EMB14 function severely impairs accumulation of 16S rRNA and several plastid encoded ribosomal genes. We show that an EMB14 transgene complements the pale green, slow growth phenotype conditioned by mutations in AtNOA1, a closely related YqeH GTPase of Arabidopsis. Taken together, we propose that the EMB14/AtNOA1/YqeH...Continue Reading

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Citations

Aug 31, 2016·Journal of Experimental Botany·Jiani YangDonald R McCarty
Jul 26, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Zhenhai CuiYan He
Jan 16, 2021·The Plant Journal : for Cell and Molecular Biology·Chunhui XuBao-Cai Tan

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