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Ef-cd locus shortens rice maturity duration without yield penalty.


ABSTRACT: The contradiction between "high yielding" and "early maturing" hampers further improvement of annual rice yield. Here we report the positional cloning of a major maturity duration regulatory gene, Early flowering-completely dominant (Ef-cd), and demonstrate that natural variation in Ef-cd could be used to overcome the above contradictory. The Ef-cd locus gives rise to a long noncoding RNA (lncRNA) antisense transcript overlapping the OsSOC1 gene. Ef-cd lncRNA expression positively correlates with the expression of OsSOC1 and H3K36me3 deposition. Field test comparisons of early maturing Ef-cd near-isogenic lines with their wild types as well as of the derivative early maturing hybrids with their wild-type hybrids conducted under different latitudes determined that the early maturing Ef-cd allele shortens maturity duration (ranging from 7 to 20 d) without a concomitant yield penalty. Ef-cd facilitates nitrogen utilization and also improves the photosynthesis rate. Analysis of 1,439 elite hybrid rice varieties revealed that the 16 homozygotes and 299 heterozygotes possessing Ef-cd matured significantly earlier. Therefore, Ef-cd could be a vital contributor of elite early maturing hybrid varieties in balancing grain yield with maturity duration.

SUBMITTER: Fang J 

PROVIDER: S-EPMC6744900 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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<i>Ef-cd</i> locus shortens rice maturity duration without yield penalty.

Fang Jun J   Zhang Fantao F   Wang Hongru H   Wang Wei W   Zhao Fei F   Li Zijuan Z   Sun Changhui C   Chen Faming F   Xu Fan F   Chang Shuoqi S   Wu Liang L   Bu Qingyun Q   Wang Pingrong P   Xie Jiankun J   Chen Fan F   Huang Xuehui X   Zhang Yijing Y   Zhu Xinguang X   Han Bin B   Deng Xiaojian X   Chu Chengcai C  

Proceedings of the National Academy of Sciences of the United States of America 20190826 37


The contradiction between "high yielding" and "early maturing" hampers further improvement of annual rice yield. Here we report the positional cloning of a major maturity duration regulatory gene, <i>Early flowering-completely dominant</i> (<i>Ef-cd</i>), and demonstrate that natural variation in <i>Ef-cd</i> could be used to overcome the above contradictory. The <i>Ef-cd</i> locus gives rise to a long noncoding RNA (lncRNA) antisense transcript overlapping the <i>OsSOC1</i> gene. <i>Ef-cd</i> l  ...[more]

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