Origin of the presence/absence variation of the LTIA1/LTIA2 mini-ribonuclease III genes required for low-temperature growth in rice
Jing Yang,
Yu Peng,
Limin Mi,
Aiqing Sun,
Ping Li,
Yan Wang,
Yi Zhang,
Sheng Teng
Affiliations
Jing Yang
Key Laboratory of Microbiological Metrology, Measurement & Bio-product Quality Security, State Administration for Market Regulation, College of Life Sciences, China Jiliang University, Hangzhou 310018, Zhejiang, China; Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China
Yu Peng
Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
Limin Mi
School of Life Sciences, Fudan University, Shanghai 200433, China
Aiqing Sun
Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China
Ping Li
College of Life Sciences, Shanghai University, Shanghai, China
Yan Wang
Key Laboratory of Microbiological Metrology, Measurement & Bio-product Quality Security, State Administration for Market Regulation, College of Life Sciences, China Jiliang University, Hangzhou 310018, Zhejiang, China
Yi Zhang
School of Agriculture, Yunnan University, Kunming 650504, Yunnan, China
Sheng Teng
Key Laboratory of Microbiological Metrology, Measurement & Bio-product Quality Security, State Administration for Market Regulation, College of Life Sciences, China Jiliang University, Hangzhou 310018, Zhejiang, China; Corresponding author.
A rice low temperature-induced albino variant was determined by the recessive ltia1 and ltia2 genes. LTIA1 and LTIA2 encode highly conserved mini-ribonucleases III located in chloroplasts and expressed in aerial parts of the plant. At low temperature, LTIA1 and LTIA2 redundantly affect chlorophyll levels, non-photochemical quenching, photosynthetic quantum yield of PS II and seedling growth. LTIA1 and LTIA2 proteins are involved in splicing of atpF and the biogenesis of 16S and 23S rRNA in chloroplasts. Presence/absence variation of LTIA1, the ancestral copy, was found only in japonica but that of LTIA2 in all rice subgroups. Accessions with LTIA2 presence tended to be distributed more remote from the equator compared to those with LTIA2 absence. LTIA2 duplicated from LTIA1 at the early stage of divergence of the AA genome Oryza species but deleted againin O. nivara. In cultivated rice, absence of LTIA2 is derived from O. nivara. LTIA1 absence occurred more recently in japonica.
