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Competitive ability depends on mating system and ploidy level across Capsella species

Orsucci, Marion and Yang, Xuyue and Vanikiotis, Theofilos and Guerrina, Maria and Duan, Tianlin and Lascoux, Martin and Glemin, Sylvain (2022). Competitive ability depends on mating system and ploidy level across Capsella species. Annals of Botany. 129 :6 , 697-708
[Research article]

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Abstract

Background and Aims Self-fertilization is often associated with ecological traits corresponding to the ruderal strategy, and selfers are expected to be less competitive than outcrossers, either because of a colonization/competition trade-off or because of the deleterious genetic effects of selfing. Range expansion could reduce further competitive ability while polyploidy could mitigate the effects of selfing. If pollinators are not limited, individual fitness is thus expected to be higher in outcrossers than in selfers and, within selfers, in polyploids than in diploids. Although often proposed in the botanical literature and also suggested by meta-analyses, these predictions have not been directly tested yet. Methods In order to compare fitness and the competitive ability of four Capsella species with a different mating system and ploidy level, we combined two complementary experiments. First, we carried out an experiment outdoors in north-west Greece, i.e. within the range of the obligate outcrossing species, C. grandiflora, where several life history traits were measured under two different disturbance treatments, weeded plots vs. unweeded plots. To better control competition and to remove potential effects of local adaptation of the outcrosser, we also performed a similar competition experiment but under growth chamber conditions. Key Results In the outdoor experiment, disturbance of the environment did not affect the phenotype in any of the four species. For most traits, the obligate outcrossing species performed better than all selfing species. In contrast, polyploids did not survive or reproduce better than diploids. Under controlled conditions, as in the field experiment, the outcrosser had a higher fitness than selfing species and was less affected by competition. Finally, contrary to the outdoor experiment where the two behaved identically, polyploid selfers were less affected by competition than diploid selfes. Conclusions In the Capsella genus, selfing induces lower fitness than outcrossing and can also reduce competitive ability. The effect of polyploidy is, however, unclear. These results highlight the possible roles of ecological context in the evolution of selfing species.

Authors/Creators:Orsucci, Marion and Yang, Xuyue and Vanikiotis, Theofilos and Guerrina, Maria and Duan, Tianlin and Lascoux, Martin and Glemin, Sylvain
Title:Competitive ability depends on mating system and ploidy level across Capsella species
Series Name/Journal:Annals of Botany
Year of publishing :2022
Volume:129
Number:6
Page range:697-708
Number of Pages:12
Publisher:OXFORD UNIV PRESS
ISSN:0305-7364
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Botany
Keywords:Mating system, ploidy, life history traits, environmental disturbance
URN:NBN:urn:nbn:se:slu:epsilon-p-117353
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117353
Additional ID:
Type of IDID
DOI10.1093/aob/mcac044
Web of Science (WoS)000796693200002
ID Code:28266
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: SLUpub Connector
Deposited On:08 Jun 2022 10:25
Metadata Last Modified:08 Jun 2022 10:31

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