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Rice LTG 1 is involved in adaptive growth and fitness under low ambient temperature
Author(s) -
Lu Guangwen,
Wu FuQing,
Wu Weixun,
Wang HongJun,
Zheng XiaoMing,
Zhang Yunhui,
Chen Xiuling,
Zhou Kunneng,
Jin Mingna,
Cheng Zhijun,
Li Xueyong,
Jiang Ling,
Wang Haiyang,
Wan Jianmin
Publication year - 2014
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.12487
Subject(s) - oryza sativa , biology , allele , cultivar , oryza , locus (genetics) , germination , domestication , botany , horticulture , genetics , gene
Summary Low temperature ( LT ) is one of the most prevalent factors limiting the productivity and geographical distribution of rice ( O ryza 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 LTG 1 ( L ow T emperature G rowth 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 LTG 1 encodes a casein kinase I. A functional nucleotide polymorphism was identified in the coding region of LTG 1 , 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 LTG 1 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 LTG 1 plays an important role in the adaptive growth and fitness of rice cultivars under conditions of low ambient temperature.