Natural variation in Early flowering1 contributes to early flowering in japonica rice under long days

Plant, Cell and Environment - Tập 37 Số 1 - Trang 101-112 - 2014
Choon‐Tak Kwon1, Soo‐Cheul Yoo1, Bon Chul Koo1, Sung‐Hwan Cho1, J. K. Park1, Zhanying Zhang2, Jinjie Li2, Zichao Li2, Nam‐Chon Paek1,3
1Department of Plant Science, Plant Genomics and Breeding Institute, and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea
2Key Lab of Crop Heterosis and Utilization of Ministry of Education, and Beijing Key Lab of Crop Genetic Improvement, China Agriculture University, Beijing, 100093 China
3Institute of Green Bio Science and Technology, Seoul National University, Pyeongchang, 232-916 Republic of Korea

Tóm tắt

AbstractNatural variation in heading‐date genes enables rice, a short‐day (SD) plant, to flower early under long‐day (LD) conditions at high latitudes. Through analysis of heading‐date quantitative trait loci (QTL) with F7 recombinant inbred lines from the cross of early heading ‘H143’ and late heading ‘Milyang23 (M23)’, we found a minor‐effect Early Heading3 (EH3) QTL in the Hd16 region on chromosome 3. We found that Early flowering1 (EL1), encoding casein kinase I (CKI), is likely to be responsible for the EH3/Hd16 QTL, because a missense mutation occurred in the highly conserved serine/threonine kinase domain of EL1 in H143. A different missense mutation was found in the EL1 kinase domain in Koshihikari. In vitro kinase assays revealed that EL1/CKI in H143 and Koshihikari are non‐functional. In F7:9 heterogeneous inbred family‐near isogenic lines (HNILs), HNIL(H143) flowered 13 days earlier than HNIL(M23) in LD, but not in SD, in which EL1 mainly acts as a LD‐dependent flowering repressor, down‐regulating Ehd1 expression. In the world rice collection, two types of non‐functional EL1 variants were found in japonica rice generally cultivated at high latitudes. These results indicate that natural variation in EL1 contributes to early heading for rice adaptation to LD in temperate and cooler regions.

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Plant, Cell and Environment

Tập 37 Số 1

101-112

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