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No difference in plasticity between different ploidy levels in the Mediterranean herb Mercurialis annua

Sanchez Vilas, Julia and Pannell, John R. 2017. No difference in plasticity between different ploidy levels in the Mediterranean herb Mercurialis annua. Scientific Reports 7 , 9484. 10.1038/s41598-017-07877-3

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Increased phenotypic plasticity for a number of plant traits has been suggested as a possible reason for the success and spread of polyploids. One such trait is a plant’s sex allocation (or gender), which influences its reproductive success directly as a function of the potentially heterogeneous mating prospects in the population. However, it is unknown how polyploidy per se might affect plasticity in a plant’s sex allocation. Although there have been numerous comparisons between diploid and (usually) tetraploid taxa, we know very little about how elevated ploidy above the diploid level might affect plasticity. Here, we ask whether different ploidy levels > 2x express different plasticity in the ruderal plant Mercurialis annua. We grew tetraploid and hexaploid hermaphrodites under different levels of nutrient availability and compared their reaction norms for growth (above-ground biomass, SLA) and reproductive traits (reproductive effort, phenotypic gender). Overall, we found that an increase in ploidy level from 4x to 6x in M. annua is associated with an increase in the relative biomass allocated to seeds, measured as female reproductive effort. However, our study provides no support for the idea that increasing ploidy level increases the ability to express different phenotypes in response to changes in the environment.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QK Botany
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 10 July 2017
Date of Acceptance: 4 July 2017
Last Modified: 06 Apr 2020 14:00

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