Journal
PLANT SIGNALING & BEHAVIOR
Volume 11, Issue 7, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15592324.2016.1192741
Keywords
Arabidopsis; CYCDs; compensation; cell cycle; nutrient allocation; plant development; plasticity; seed size; seed number
Categories
Funding
- BBSRC [BB/J009199/1]
- Bayer Crop Science
- BBSRC [BB/E024858/1, BB/G00482X/1, BB/L009358/1, BB/E022383/2] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/J009199/1, BB/E022383/2, BB/L009358/1, BB/G00482X/1, BB/E024858/1] Funding Source: researchfish
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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.
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