Lab Overview
Our lab focuses on understanding the complex relationships between plants and their environment and the evolution of plant adaptations. We conduct manipulative experiments and use the extensive collections and natural areas of The Holden Arboretum as well as the collections of the Rhododendron Species Foundation for our research. We employ techniques from physiological and evolutionary ecology to investigate: 
            leaf, xylem and root adaptations
            whole plant co-ordination of function
            the effects of habitat alteration and climate change
            plant responses to stressful events and environments

Rhododendron austrinum leaf vein, from a plant growing in the Layer Garden at the Holden Arboretum 
(Preparation by C Dowrey, Photo C Heffer).

February 21, 2018 New paper published, with beautiful and informative artwork done by Sharon Danielson. Medeiros JS and SC Danielson. 2018. Renewed interest in whole-plant physiology sheds light on the complexity of plant stress response architecture. Tree Physiology

January 4, 2018 PhysFest2 is coming to Holden Arboretum July 15-19, 2018. This event will provide graduate student training in ecophysiology techniques, create a data set on canopy physiology using the canopy walk and emergent tower at Holden, and provide training on scientific communication for the public. For more information check out the PHYSFEST2 website

September 6, 2017 Welcome new graduate student Samia Hamati to the lab. Ms. Hamati will be jointly advised by Dr. Medeiros and Dr. David Ward, the KSU Art and Margaret Herrick Endowed Professor of Plant Biology. Samia will study how environmental factors such as competition for light affect growth and physiological stress tolerance in the evergreen shrub Juniperus virginiana, and how this relates to the recent expansion of the species range into mid-western grassland ecosystems.

August 3, 2017 A Rhododendron Research Network has been established in conjunction with the American Rhododendron Society. Dr. Juliana Medeiros and colleague Dr. Erik Nilsen (Virginia Tech) will lead the network, which will focus on creating opportunities for international collaborations and citizen science opportunities in Rhododendron. You can learn more about the network and follow our progress at

June 14, 2017 New paper out in the American Journal of Botany "Decoupled leaf and root carbon economics is a key component in the ecological diversity and evolutionary divergence of deciduous and evergreen lineages of genus Rhododendron". Check it out at this link:

May 30, 2017 Welcome new undergraduate intern Madison Proctor to the lab. Madison is a student at Hiram College, and we are very pleased to have here at Holden for the whole summer. Madison will be investigating the effects of grafted root stocks on leaf and root trait coordination in Rhododendrons. 

April 17, 2017 First day of a sample collecting campaign at the Rhododendron Species Foundation Botanical Garden. The flowers are beautiful and I can't wait to see how our data turns out! See the "Flower carbon economy" link under the "Current research projects" tab for more information about this exciting new project. 

April 5, 2017 Congratulations to Sharon Danielson for her acceptance to Case Western Reserve University Department of Biology PhD program! Sharon will work in our lab here at Holden Arboretum studying the physiological responses of urban and rural trees to climatic stress.

Follow us on Twitter @MedeirosLab
For more information please visit my ResearchGate Profile