Rice LTG1 is involved in adaptive growth and fitness under low ambient temperature

Guangwen Lu, Fu-Qing Wu, Weixun Wu, Hong-Jun Wang, Xiao-Ming Zheng, Yunhui Zhang, Xiuling Chen, Kunneng Zhou, Mingna Jin, Zhijun Cheng, Xueyong Li, Ling Jiang, Haiyang Wang, Jianmin Wan
The Plant Journal, 2014, 78(3): 468-480  DOI: 10.1111/tpj.12487;      追溯原文......本站官方QQ群:62473826
rice (Oryza sativa L.); low ambient temperature; adaptive growth; casein kinase I; functional nucleotide polymorphism

Low temperature (LT) is one of the most prevalent factors limiting the productivity and geographical distribution of rice (Oryza sativa L.). Although significant progress has been made in elucidating the effect of LT on seed germination and reproductive development in rice, the genetic component affecting vegetative growth under LT remains poorly understood. Here, we report that rice cultivars harboring the dominant LTG1 (Low Temperature Growth 1) allele are more tolerant to LT (15–25°C, a temperature range prevalent in high‐altitude, temperate zones and high‐latitude areas), than those with the ltg1 allele. Using a map‐based cloning strategy, we show that LTG1 encodes a casein kinase I. A functional nucleotide polymorphism was identified in the coding region of LTG1, causing a single amino acid substitution (I357K) that is associated with the growth rate, heading date and yield of rice plants grown at LT. We present evidence that LTG1 affects rice growth at LT via an auxin‐dependent process(es). Furthermore, phylogenetic analysis of this locus suggests that the ltg1 haplotype arose before the domestication of rice in tropical climates. Together, our data demonstrate that LTG1 plays an important role in the adaptive growth and fitness of rice cultivars under conditions of low ambient temperature.



  杂种衰退;酪蛋白激酶 hbd2; OsCKI1; LTG1; LTRPK1