Developmental control and plasticity of fruit and seed dimorphism in aethionema arabicum

Teresa Lenser, Kai Graeber, Özge Selin Cevik, Setareh Mohammadin, Phuong Nguyen, M.E. Schranz, Ortrun Mittelsten Scheid

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16 Citations (Scopus)

Abstract

Understanding how plants cope with changing habitats is a timely and important topic in plant research. Phenotypic plasticity describes the capability of a genotype to produce different phenotypes when exposed to different environmental conditions. In contrast, the constant production of a set of distinct phenotypes by one genotype mediates bet hedging, a strategy that reduces the temporal variance in fitness at the expense of a lowered arithmetic mean fitness. Both phenomena are thought to represent important adaptation strategies to unstable environments. However, little is known about the underlying mechanisms of these phenomena, partly due to the lack of suitable model systems. We used phylogenetic and comparative analyses of fruit and seed anatomy, biomechanics, physiology, and environmental responses to study fruit and seed heteromorphism, a typical morphological basis of a bet-hedging strategy of plants, in the annual Brassicaceae species Aethionema arabicum. Our results indicate that heteromorphism evolved twice within the Aethionemeae, including once for themonophyletic annual Aethionema clade. The dimorphism of Ae. arabicum is associated with several anatomic, biomechanical, gene expression, and physiological differences between the fruit and seed morphs. However, fruit ratios and numbers change in response to different environmental conditions. Therefore, the life-history strategy of Ae. arabicum appears to be a blend of bet hedging and plasticity. Together with the available genomic resources, our results pave the way to use this species in future studies intended to unravel the molecular control of heteromorphism and plasticity.

LanguageEnglish
Pages1691-1707
JournalPlant Physiology
Volume172
Issue number3
DOIs
Publication statusPublished - 2016

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dimorphism
Fruit
Seeds
fruits
seeds
seed anatomy
Genotype
Brassicaceae
Phenotype
phenotype
environmental factors
genotype
morphs
phenotypic plasticity
Biomechanical Phenomena
Ecosystem
Anatomy
physiology
life history
genomics

Cite this

Lenser, Teresa ; Graeber, Kai ; Cevik, Özge Selin ; Mohammadin, Setareh ; Nguyen, Phuong ; Schranz, M.E. ; Scheid, Ortrun Mittelsten. / Developmental control and plasticity of fruit and seed dimorphism in aethionema arabicum. In: Plant Physiology. 2016 ; Vol. 172, No. 3. pp. 1691-1707.
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Developmental control and plasticity of fruit and seed dimorphism in aethionema arabicum. / Lenser, Teresa; Graeber, Kai; Cevik, Özge Selin; Mohammadin, Setareh; Nguyen, Phuong; Schranz, M.E.; Scheid, Ortrun Mittelsten.

In: Plant Physiology, Vol. 172, No. 3, 2016, p. 1691-1707.

Research output: Contribution to journalArticleAcademicpeer-review

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