期刊
ANNALS OF BOTANY
卷 127, 期 7, 页码 887-902出版社
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcab028
关键词
Brassicaceae; climate; glucosinolates; plant defence; range size; seasonality; soil chemistry; Streptanthus
资金
- National Science Foundation [0919559]
- Consejo Nacional de Ciencia y Tecnologia (Conacyt) [187083]
- program UNAM-DGAPA-PAPIIT [IA201516]
- Division Of Environmental Biology
- Direct For Biological Sciences [0919559] Funding Source: National Science Foundation
Climate seasonality and glucosinolate compounds are positively associated with genome size, while life history, geographic range size, or soil nutrients do not have a significant impact on genome size in this clade of Brassicaceae.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据