Authors: Dongsheng Zhao Changquan Zhang Qianfeng Li Qingqing Yang Minghong Gu Qiaoquan Liu
Publish Date: 2016/02/12
Volume: 91, Issue: 1-2, Pages: 161-177
Abstract
The plastid ribosome is essential for chloroplast biogenesis as well as seedling formation As the plastid ribosome closely resembles the prokaryotic 70S ribosome many plastid ribosomal proteins PRPs have been identified in higher plants However their assembly in the chloroplast ribosome in rice remains unclear In the present study we identified a novel rice mutant albino lethal 1 al1 from a chromosome segment substitution line population The al1 mutant displayed an albino phenotype at the seedling stage and did not survive past the threeleaf stage No other apparent differences in plant morphology were observed in the al1 mutant The albino phenotype of the al1 mutant was associated with decreased chlorophyll content and abnormal chloroplast morphology Using fine mapping AL1 was shown to encode the PRPL12 a protein localized in the chloroplasts of rice and a spontaneous singlenucleotide mutation C/T resulting in a residue substitution from leucine in AL1 to phenylalanine in al1 was found to be responsible for the early seedling lethality This point mutation is located at the L10 interface feature of the L12/AL1 protein Yeast twohybrid analysis showed that there was no physical interaction between al1 and PRPL10 In addition the mutation had little effect on the transcript abundance of al1 but had a remarkable effect on the protein abundance of al1 and transcript abundance of chloroplast biogenesisrelated and photosynthesisrelated genes These results provide a first glimpse into the molecular details of L12’s function in riceThis study was funded by the Ministry of Science and Technology of China the Ministry of Agriculture of China Grants 2014ZX08009024B 2016ZX08009003004 and Jiangsu PAPD and Qinglan Projects to Q Q L and the Graduate Students Research and Innovation Program from Jiangsu Government of China Grant KYZZ 0365 to DSZ
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