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Identification and Characterization of LARGE EMBRYO, a New Gene Controlling Embryo Size in Rice (Oryza sativa L.)

Cited 4 time in Web of Science Cited 6 time in Scopus
Authors
Lee, Gileung; Piao, Rihua; Lee, Yunjoo; Kim, Backki; Seo, Jeonghwan; Lee, Dongryung; Jang, Su; Jin, Zhuo; Lee, Choonseok; Chin, Joong Hyoun; Koh, Hee-Jong
Issue Date
2019-04-11
Publisher
BioMed Central
Citation
Rice, 12(1):22
Keywords
RiceLarge embryoGiant embryoC3HC4-type RING finger proteinNutritional value
Abstract
Background
Although embryo accounts for only 2–3% of the total weight of a rice grain, it is a good source of various nutrients for human health. Because enlarged embryo size causes increase of the amount of nutrients and bioactive compounds stored within rice grain, giant embryo mutants of rice (Oryza sativa L.) are excellent genetic resources for improving the nutritional value of rice grains.

Results
Three giant embryo mutants, including large embryo (le), giant embryo (ge) and super-giant embryo (ges), with variable embryo size were used in this study. We investigated whether genes controlling embryo size in these mutants (le, ge and ges) were allelic to each other. Although ge and ges was allelic to GIANT EMBRY (GE), le was not allelic to ge and ges in allelism test. The GE gene carried a unique nucleotide substitution in each of the two mutants (ge and ges), resulting in non-synonymous mutations in exon 2 of GE in both mutants. However, the GE gene of the le mutant did not carry any mutation, suggesting that the enlarged embryo phenotype of le was governed by another gene. Using map-based cloning, we mapped the LE gene to the short arm of chromosome 3. The le mutant showed mild enlargement in embryo size, which resulted from an increase in the size of scutellar parenchyma cells. The LE encodes a C3HC4-type RING finger protein and was expressed to relatively high levels in seeds at a late developmental stage. Knockdown of LE expression using RNA interference increased the embryo size of rice grains, confirming the role of LE in determining the embryo size.

Conclusion
Overall, we identified a new gene controlling embryo size in rice. Phenotypic and molecular characterization results suggest that the le mutant will serve as a valuable resource for developing new rice cultivars with large embryos and nutrient-dense grains.
ISSN
1939-8433
Language
English
URI
https://hdl.handle.net/10371/153243
DOI
https://doi.org/10.1186/s12284-019-0277-y
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Plant Science (식물생산과학부)Journal Papers (저널논문_식물생산과학부)
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