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Seed size plasticity in response to embryonic lethality conferred by ectopic CYD activation is dependent on plant architecture

Sornay, Emily, Dewitte, Walter and Murray, James Augustus Henry 2016. Seed size plasticity in response to embryonic lethality conferred by ectopic CYD activation is dependent on plant architecture. Plant Signaling & Behaviour 11 (7) , e1192741. 10.1080/15592324.2016.1192741

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Abstract

The size of seeds is the result of cell proliferation and growth in the three seed compartments: the embryo, endosperm and integuments. Targeting expression of the D-type cyclin CYCD7;1 to the central cell and early endosperm (FWA:CYCD7;1) triggered nuclear divisions and partial ovule abortion, reducing seed number in each silique and leading to increased seed size. A similar effect on seed size was observed with other segregating embryo lethal mutations, suggesting caution is needed in interpreting apparent seed size phenotypes. Here, we show that the positive effect of FWA:CYCD7;1 on Arabidopsis seed size is modulated by the architecture of the mother plant. Larger seeds were produced in FWA:CYCD7;1 lines with unmodified inflorescences, and also upon removal of side branches and axillary stems. This phenotype was absent from inflorescences with increased axillary floral stems produced by pruning of the main stem. Given this apparent confounding influence of resource allocation on transgenes effect, we conclude that plant architecture is a further important factor to consider in appraising seed phenotypes.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Biosciences
Publisher: Taylor & Francis
ISSN: 1559-2324
Date of First Compliant Deposit: 2 June 2016
Date of Acceptance: 18 May 2016
Last Modified: 24 Jul 2019 20:25
URI: http://orca.cf.ac.uk/id/eprint/91486

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