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Reference Detail
| Reference | ||
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| Author | Nagasawa N., Hibara K.I., Heppard E.P., Vander Velden KA., Luck S., Beatty M., Nagato Y., Sakai H. | |
| Title | GIANT EMBRYO, encoding CYP78A13, affects size balance between embryo and endosperm in rice. | |
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Abstract: The embryo/endosperm size in mature seed differs among angiosperms to a high degree. However, little is known about the molecular mechanism underlying the size control between these neighboring tissues. Here we report the rice GIANT EMBRYO (GE) gene that is essential for controlling the size balance. GE function in each tissue is distinct, controlling cell size in the embryo and cell death in the endosperm. GE, which encodes CYP78A13, is predominantly expressed in the interfacing tissues of the both embryo and endosperm. GE expression is under negative feedback regulation; endogenous GE expression is up-regulated in ge mutants. In contrast to the loss-of-function mutant with large embryo and small endosperm, GE over-expression caused small embryo and enlarged endosperm. The complementation analysis coupled with heterofertilization showed that complementation of ge mutation in either embryo or endosperm failed to restore the wild-type embryo/endosperm ratio. Thus embryo and endosperm interact in determining embryo/endosperm size balance. Among genes associated with embryo/endosperm size, REDUCED EMBRYO genes, whose loss-of-function causes a phenotype opposite to ge, are revealed to regulate endosperm size upstream of GE. To fully understand the embryo-endosperm size control, genetic network of the related genes should be elucidated. This article is protected by copyright. All rights reserved. |
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| Journal | Plant J. | |
| Country | USA | |
| Volume | 75(4) | |
| Pages | 592-605 | |
| Year | 2013 | |
| PubMed ID | 23621326 | |
| PubMed Central ID | - | |
| DOI | 10.1111/tpj.12223 | |
| URL | - | |
| Relation | ||
| Gene | GE1 RE1 RE2 | |
| INSD | AB780362 | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
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Lethal Embryo Mutantion Strain |
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Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
