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Polyploidy affects plant growth and alters cell wall composition

Lookup NU author(s): Professor William WillatsORCiD


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© 2019 American Society of Plant Biologists. All rights reserved. Polyploidization has played a key role in plant breeding and crop improvement. Although its potential to increase biomass yield is well described, the effect of polyploidization on biomass composition has largely remained unexplored. Here, we generated a series of Arabidopsis (Arabidopsis thaliana) plants with different somatic ploidy levels (2n, 4n, 6n, and 8n) and performed rigorous phenotypic characterization. Kinematic analysis showed that polyploids developed slower compared to diploids; however, tetra-and hexaploids, but not octaploids, generated larger rosettes due to delayed flowering. In addition, morphometric analysis of leaves showed that polyploidy affected epidermal pavement cells, with increased cell size and reduced cell number per leaf blade with incrementing ploidy. However, the inflorescence stem dry weight was highest in tetraploids. Cell wall characterization revealed that the basic somatic ploidy level negatively correlated with lignin and cellulose content, and positively correlated with matrix polysaccharide content (i.e. hemicellulose and pectin) in the stem tissue. In addition, higher ploidy plants displayed altered sugar composition. Such effects were linked to the delayed development of polyploids. Moreover, the changes in polyploid cell wall composition promoted saccharification yield. The results of this study indicate that induction of polyploidy is a promising breeding strategy to further tailor crops for biomass production.

Publication metadata

Author(s): Corneillie S, De Storme N, Van Acker R, Fangel JU, De Bruyne M, De Rycke R, Geelen D, Willats WGT, Vanholme B, Boerjan W

Publication type: Article

Publication status: Published

Journal: Plant Physiology

Year: 2019

Volume: 179

Issue: 1

Pages: 74-87

Print publication date: 01/01/2019

Online publication date: 09/10/2018

Acceptance date: 21/09/2018

ISSN (print): 0032-0889

ISSN (electronic): 1532-2548

Publisher: American Society of Plant Biologists


DOI: 10.1104/pp.18.00967

PubMed id: 30301776


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