“I am fascinated by the endless variation of growth forms in flowering plants and its evolutionary adaptive significance”. Starting with a plant anatomical background, I later learned how to functionally interpret anatomical observations with respect to drought stress tolerance. As an evolutionary biologist, I am eager to better understand why plants became woody during evolutionary history and why these woodiness transitions evolved hundreds of times. By combining models of evolution and ecology with experimental work, I am developing a new, multidisciplinary line of research on the topic of wood evolution that will yield unprecedented insights to better understand how wild plants and crops react to drought stress in a world facing global change.
Derived woodiness, drought stress tolerance, evolution of woodiness, hydraulic failure, insular woodiness, molecular wood pathway, wood anatomy
Evolution towards WoodinessFinding the drivers
Why have so many herbaceous lineages returned to a woody life form?
I discovered that transitions from herbaceousness towards derived woodiness have happened at least 700 times independently during evolutionary history of flowering plants. This raises the intriguing question what are the environmental and genetic drivers of wood formation across all these transitions.
A selection of the topics I am working on currently.
- Dória L.C., Podadera D.S., del Arco M., Chauvin T., Smets E., Delzon S., Lens F. 2018. Insular woody daisies (Argyranthemum, Asteraceae) are more resistant to drought-induced hydraulic failure than their herbaceous relatives. Functional Ecology 32: 1467-1478.
- Lens F., Picon-Cochard C., Delmas C., Signarbieux C., Buttler A., Jansen S., Chauvin T., Chacon Dória L., del Arco M., Cochard H., Delzon S. 2016. Herbaceous angiosperms are not more vulnerable to drought-induced embolism than angiosperm trees. Plant Physiology 172: 661-667.
- Choat B., Jansen S., Brodribb T.J., Cochard H., Delzon S., Bhaskar R., Bucci S., Feild T.S., Gleason S.M., Hacke U.G., Jacobsen A.L., Lens F., Maherali H., Martinez-Vilalta J., Mayr S., Mencuccini M., Mitchell P.J., Nardini A., Pittermann J., Pratt R.B., Sperry J.S., Westoby M., Wright I.J., Zanne A. 2012. Global convergence in the vulnerability of forests to drought. Nature 491: 752-756.
- Lens F., Sperry J.S., Christman M.A., Choat B., Rabaey D., Jansen S. 2011. Testing hypotheses that link wood anatomy to cavitation resistance and hydraulic conductivity in the genus Acer. New Phytologist 190: 709-723.
- Melzer S., Lens F., Gennen J., Vanneste S., Rhode A., Beeckman T. 2008. Flowering-time genes modulate meristem determinacy and growth form in Arabidopsis. Nature Genetics 40: 1489-1492.
PhD and postdocsupervision
My team currently includes two postdocs and four PhD students, and a number of BSc and MSc students.
- Kasper Hendriks - postdoc - Building Tree of Life of Brassicaceae and exploring convergent evolution towards woodiness in this family
- Giovanni Bortolami - postdoc - Herb hydraulics: testing the role of root pressure to unravel the dynamics of drought-induced vascular dysfunction in stems
- Mehrdad Jahanbanifard - PhD - Identification of ebony woods using AI algorithms from anatomy and chemical profiling
- Ajaree Thonglim - PhD - Assessing structure-function relationships in stems and leaves of Brassicaceae
- Vicky Beckers - PhD - Comparative wood anatomy of the tropical families Apocynaceae and Sapotaceae
- Ryan Brewer - PhD - Trait-dependent diversification in Canary Island angiosperms
- BSc: Biodiversity of Plants - Tree of Life (plant anatomy), Leiden Univ.
- BSc: MINOR Scales in Biodiversity (integrated wood anatomy), Leiden Univ.
- MSc: Development and Evolution (derived woodiness), Leiden Univ.
The following projects are available to BSc and MSc students