Claim · model-written summary
A fourth large-subunit gene is functional.
Zea maysNot reportedDirection
Verbatim
e0“Data herein also show the functionality of a fourth gene encoding the large subunit of this enzyme.”
e1“Three maize genes”
Title
Fundamental differences in starch synthesis in the maize leaf, embryo, ovary and endosperm
Susan K. Boehlein; Janine R. Shaw; Timothy J. Boehlein; et al. The Plant Journal 2018. doi:10.1111/tpj.14053
Other claims from this paper (13)
- Mechanism Leaf starch synthesis uses AGPase encoded by leaf-expressed subunits.
- Observation Multiple AGPase isoforms function in embryo and ovary.
- Association Embryo starch content depends on genes active in leaf and endosperm.
- Mechanism Shrunken-2 and brittle-2 AGPase synthesizes about 75% of endosperm starch.
- Mechanism agpsemzm and agpllzm encode plastid-localized endosperm AGPase.
- Observation Loss of plastid-localized AGPase does not reduce endosperm starch.
- Mechanism The data suggest AGPase-independent synthesis supplies about 25% of endosperm starch.
- Observation Three maize genes encode the AGPase small subunit.
- Observation The triple small-subunit mutant is lethal in early seed development.
- Observation The triple mutant is viable in male and female gametes.
- Intervention effect Any one of the three small-subunit genes restores seed and plant viability.
- Mechanism AGPase is essential for maize viability.
- Observation Starch synthesis differs and is coordinated across maize embryo, ovary, leaf and endosperm.