Environmental Regulation of Heterosis in the Allopolyploid Arabidopsis suecica

Plant Physiology
Erik M SolhaugAndreas Madlung

Abstract

Allopolyploids are organisms possessing more than two complete sets of chromosomes from two or more species and are frequently more vigorous than their progenitors. To address the question why allopolyploids display hybrid vigor, we compared the natural allopolyploid Arabidopsis suecica to its progenitor species Arabidopsis thaliana and Arabidopsis arenosa. We measured chlorophyll content, CO2 assimilation, and carbohydrate production under varying light conditions and found that the allopolyploid assimilates more CO2 per unit chlorophyll than either of the two progenitor species in high intensity light. The increased carbon assimilation corresponds with greater starch accumulation, but only in strong light, suggesting that the strength of hybrid vigor is dependent on environmental conditions. In weaker light A. suecica tends to produce as much primary metabolites as the better progenitor. We found that gene expression of LIMIT DEXTRINASE1, a debranching enzyme that cleaves branch points within starch molecules, is at the same level in the allopolyploid as in the maternal progenitor A. thaliana and significantly more expressed than in the paternal progenitor A. arenosa. However, expression differences of β-amylases and GLUCAN-W...Continue Reading

Citations

May 9, 2018·Evolution; International Journal of Organic Evolution·Mads F SchouTorsten N Kristensen
Jan 19, 2019·Molecular Biology and Evolution·Paulina Martinez PalaciosKarine Alix
Nov 19, 2019·The Plant Journal : for Cell and Molecular Biology·Hong LiXiangfeng Wang
Mar 30, 2018·Journal of the Royal Society, Interface·Atticus Pinzon-RodriguezRachel Muheim

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