Abstract
Fruit functions in seed protection and dispersal and belongs to many dry and fleshy types,yet their evolutionary pattern remains unclear in part due to uncertainties in the phylogenetic relationships among several orders and fami-lies.Thus we used nuclear genes of 502 an-giosperm species representing 231 families to reconstruct a well supported phylogeny,with resolved relationships for orders and families with previously uncertain placements.Using this phylogeny as a framework,molecular dating supports a Triassic origin of the crown angiosperms,followed by the emergence of most orders in the Jurassic and Cretaceous and their rise to ecological dominance during the Cretaceous Terrestrial Revolution.The ro-bust phylogeny allowed an examination of the evolutionary pattern of fruit and ovary types,revealing a trend of parallel carpel fusions during early diversifications in eudicots,mon-ocots,and magnoliids.Moreover,taxa in the same order or family with the same ovary type can develop either dry or fleshy fruits with strong correlations between specific types of dry and fleshy fruits;such associations of ovary,dry and fleshy fruits define several ovary-fruit"modules"each found in multiple families.One of the frequent modules has an ovary containing multiple ovules,capsules and ber-ries,and another with an ovary having one or two ovules,achenes(or other single-seeded dry fruits)and drupes.This new perspective of re-lationships among fruit types highlights the closeness of specific dry and fleshy fruit types,such as capsule and berry,that develop from the same ovary type and belong to the same module relative to dry and fleshy fruits of other modules(such as achenes and drupes).Further analyses of gene families containing known genes for ovary and fruit de-velopment identified phylogenetic nodes with multiple gene duplications,supporting a pos-sible role of whole-genome duplications,in combination with climate changes and animal behaviors,in angiosperm fruit and ovary diversification.
基金项目
National Natural Science Foundation of China(31670209)
National Natural Science Foundation of China(31770242)
National Natural Science Foundation of China(31970224)
China Postdoctoral Science Foundation(2019M661344)
Ministry of Education Key Laboratory of Biodiversity Science and Ecological Engineering and State Key Laboratory of Genetic ()
National Top Talent Undergraduate Training Program for outstanding undergraduates and the Wangdao Program for undergraduate ()
Eberly College of Science(Department of Biology)()
Huck Institutes for the Life Sciences at the Pennsylvania State University()
NETL
NSTL
万方数据