Research Cone size is related to branching architecture in conifers Andrew B. Leslie1,4, Jeremy M. Beaulieu2, Peter R. Crane1 and Michael J. Donoghue3 1School of Forestry and Environmental Studies, Yale University, 195 Prospect Street, New Haven, CT 06511, USA; 2National Institute for Mathematical and Biological Synthesis, University of Tennessee, 1122 Volunteer Blvd, Ste. 106, Knoxville, TN 37996, USA; 3Department of Ecology and Evolutionary Biology, Yale University, PO Box 208106, New Haven, CT 06520, USA; 4Present address: Department of Ecology and Evolutionary Biology, Brown University, Box G-W, 80 Waterman Street, Providence, RI 02912, USA Summary Author for correspondence: The relationship between branch diameter and leaf size has been widely used to understand Andrew B. Leslie how vegetative resources are allocated in plants. Branching architecture influences reproduc- Tel: +1 2034327168 tive allocation as well, but fewer studies have explored this relationship at broad phylogenetic Email:
[email protected] or ecological scales. In this study, we tested whether pollen-producing and seed-producing Received: 27 January 2014 cone size scales with branch diameter in conifers, a diverse and globally distributed lineage of Accepted: 24 April 2014 nonflowering seed plants. Branch diameter and cone size were analyzed using multiple regression models and evolu- New Phytologist (2014) 203: 1119–1127 tionary models of trait evolution for a data set of 293 extant conifer species within an explicit doi: 10.1111/nph.12864 phylogenetic framework. Branch diameter is a strong predictor of cone size across conifer species, particularly for pol- Key words: allometry, conifer, Corner’s len cones and dry seed cones. However, these relationships are complex in detail because leaf rules, pollen cone, seed cone.