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Am J Bot

Title:		Genetic and spatial variation in vegetative and floral traits across a hybrid zone
Author(s):		Campbell DR; Raguso RA; Midzik M; Bischoff M; Broadhead GT;
Address:		"Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, 92697, USA. Rocky Mountain Biological Laboratory, Crested Butte, CO, 81224, USA. Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, 14853, USA. Environmental Research Institute, North Highland College, Castle Street, Thurso, KW14 7JD, UK"
Journal Title:		Am J Bot
Year:		2022
Volume:		20221004
Issue:		11
Page Number:		1780 - 1793
DOI:		10.1002/ajb2.16067
ISSN/ISBN:		1537-2197 (Electronic) 0002-9122 (Print) 0002-9122 (Linking)
Abstract:		"PREMISE: Genetic variation influences the potential for evolution to rescue populations from impacts of environmental change. Most studies of genetic variation in fitness-related traits focus on either vegetative or floral traits, with few on floral scent. How vegetative and floral traits compare in potential for adaptive evolution is poorly understood. METHODS: We measured variation across source populations, planting sites, and genetic families for vegetative and floral traits in a hybrid zone. Seeds from families of Ipomopsis aggregata, I. tenuituba, and F(1) and F(2) hybrids of the two species were planted into three common gardens. Measured traits included specific leaf area (SLA), trichomes, water-use efficiency (WUE), floral morphology, petal color, nectar, and floral volatiles. RESULTS: Vegetative traits SLA and WUE varied greatly among planting sites, while showing weak or no genetic variation among source populations. Specific leaf area and trichomes responded plastically to snowmelt date, and SLA exhibited within-population genetic variation. All aspects of floral morphology varied genetically among source populations, and corolla length, corolla width, and sepal width varied genetically within populations. Heritability was not detected for volatiles due to high environmental variation, although one terpene had high evolvability, and high emission of two terpenes, a class of compounds emitted more strongly from the calyx than the corolla, correlated genetically with sepal width. Environmental variation across sites was weak for floral morphology and stronger for volatiles and vegetative traits. The inheritance of three of four volatiles departed from additive. CONCLUSIONS: Results indicate stronger genetic potential for evolutionary responses to selection in floral morphology compared with scent and vegetative traits and suggest potentially adaptive plasticity in some vegetative traits"
Keywords:		Phenotype *Trichomes/genetics *Flowers/genetics Plant Leaves/genetics Plant Nectar Pheromones Polemoniaceae common garden floral morphology floral scent genetic variation genotype by environment interaction heritability specific leaf area water-use effici;
Notes:		"MedlineCampbell, Diane R Raguso, Robert A Midzik, Maya Bischoff, Mascha Broadhead, Geoffrey T eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2022/10/05 Am J Bot. 2022 Nov; 109(11):1780-1793. doi: 10.1002/ajb2.16067. Epub 2022 Oct 4"