N Ivalú Cacho1,2,3, Patrick J McIntyre2,4, Daniel J Kliebenstein5,6, Sharon Y Strauss2. 1. Instituto de Biología, Universidad Nacional Autónoma de México. Circuito Exterior, Ciudad Universitaria, Mexico City, Mexico. 2. Center for Population Biology, University of California, One Shields Avenue, Davis, CA, USA. 3. Department of Evolution of Ecology, University of California, One Shields Avenue, Davis, CA, USA. 4. NatureServe, Boulder, CO, USA. 5. Department of Plant Sciences, University of California, One Shields Avenue, Davis, CA, USA. 6. DynaMo Centre of Excellence, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg C, Denmark.
Abstract
BACKGROUND AND AIMS: We investigate patterns of evolution of genome size across a morphologically and ecologically diverse clade of Brassicaceae, in relation to ecological and life history traits. While numerous hypotheses have been put forward regarding autecological and environmental factors that could favour small vs. large genomes, a challenge in understanding genome size evolution in plants is that many hypothesized selective agents are intercorrelated. METHODS: We contribute genome size estimates for 47 species of Streptanthus Nutt. and close relatives, and take advantage of many data collections for this group to assemble data on climate, life history, soil affinity and composition, geographic range and plant secondary chemistry to identify simultaneous correlates of variation in genome size in an evolutionary framework. We assess models of evolution across clades and use phylogenetically informed analyses as well as model selection and information criteria approaches to identify variables that can best explain genome size variation in this clade. KEY RESULTS: We find differences in genome size and heterogeneity in its rate of evolution across subclades of Streptanthus and close relatives. We show that clade-wide genome size is positively associated with climate seasonality and glucosinolate compounds. Model selection and information criteria approaches identify a best model that includes temperature seasonality and fraction of aliphatic glucosinolates, suggesting a possible role for genome size in climatic adaptation or a role for biotic interactions in shaping the evolution of genome size. We find no evidence supporting hypotheses of life history, range size or soil nutrients as forces shaping genome size in this system. CONCLUSIONS: Our findings suggest climate seasonality and biotic interactions as potential forces shaping the evolution of genome size and highlight the importance of evaluating multiple factors in the context of phylogeny to understand the effect of possible selective agents on genome size.
BACKGROUND AND AIMS: We investigate patterns of evolution of genome size across a morphologically and ecologically diverse clade of Brassicaceae, in relation to ecological and life history traits. While numerous hypotheses have been put forward regarding autecological and environmental factors that could favour small vs. large genomes, a challenge in understanding genome size evolution in plants is that many hypothesized selective agents are intercorrelated. METHODS: We contribute genome size estimates for 47 species of Streptanthus Nutt. and close relatives, and take advantage of many data collections for this group to assemble data on climate, life history, soil affinity and composition, geographic range and plant secondary chemistry to identify simultaneous correlates of variation in genome size in an evolutionary framework. We assess models of evolution across clades and use phylogenetically informed analyses as well as model selection and information criteria approaches to identify variables that can best explain genome size variation in this clade. KEY RESULTS: We find differences in genome size and heterogeneity in its rate of evolution across subclades of Streptanthus and close relatives. We show that clade-wide genome size is positively associated with climate seasonality and glucosinolate compounds. Model selection and information criteria approaches identify a best model that includes temperature seasonality and fraction of aliphatic glucosinolates, suggesting a possible role for genome size in climatic adaptation or a role for biotic interactions in shaping the evolution of genome size. We find no evidence supporting hypotheses of life history, range size or soil nutrients as forces shaping genome size in this system. CONCLUSIONS: Our findings suggest climate seasonality and biotic interactions as potential forces shaping the evolution of genome size and highlight the importance of evaluating multiple factors in the context of phylogeny to understand the effect of possible selective agents on genome size.
Authors: Patrick P Edger; Hanna M Heidel-Fischer; Michaël Bekaert; Jadranka Rota; Gernot Glöckner; Adrian E Platts; David G Heckel; Joshua P Der; Eric K Wafula; Michelle Tang; Johannes A Hofberger; Ann Smithson; Jocelyn C Hall; Matthieu Blanchette; Thomas E Bureau; Stephen I Wright; Claude W dePamphilis; M Eric Schranz; Michael S Barker; Gavin C Conant; Niklas Wahlberg; Heiko Vogel; J Chris Pires; Christopher W Wheat Journal: Proc Natl Acad Sci U S A Date: 2015-06-22 Impact factor: 11.205
Authors: Petr Šmarda; Petr Bureš; Lucie Horová; Ilia J Leitch; Ladislav Mucina; Ettore Pacini; Lubomír Tichý; Vít Grulich; Olga Rotreklová Journal: Proc Natl Acad Sci U S A Date: 2014-09-15 Impact factor: 11.205
Authors: Mohammad Salehin; Baohua Li; Michelle Tang; Ella Katz; Liang Song; Joseph R Ecker; Daniel J Kliebenstein; Mark Estelle Journal: Nat Commun Date: 2019-09-06 Impact factor: 14.919