Department of Experimental and Functional Morphology

Located in Třeboň, South Bohemia

Head: prof. RNDr. Jitka Klimešová, CSc.

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Research topics

  • Disentangling the diversity of root sprouting vigor using data on hormonal balance in roots and root anatomy
  • Describing the economic spectrum of belowground coarse organs like rhizomes, thick roots, tubers, or bulbs and studying their persistence, anatomy, carbohydrate storage, and dry matter content
  • Assessing which functional traits promote plant persistence in insular systems
  • Examining disturbance responses by comparing clonal versus non-clonal plants
  • Investigating eco-physiological traits of aquatic carnivorous plants in relation to their growth, mineral nutrition, trap characteristics, and turion dormancy. 

The main research interest of our team are constraints that plant morphology is constituting for plant ecological functions. We test our ideas through manipulative experiments as well as using field assessments of plant traits and their distribution along environmental gradients.

In our studies, we use plant morphology, anatomy, and ecophysiology. To increase awareness of plant morphology and anatomy, we provide guidance in the form of databases, handbooks, and courses.

Selected recent results

1/ How does the intensity of management affect temperate grasslands?

Ecologists pay little attention to the underground part of the plant, and when they study it, they focus on the roots and their function in obtaining nutrients. However, plants also have other organs underground, in the case of herbs these are mainly rhizomes. The rhizomes contain carbon storage, ensure the horizontal spread of the plant, mediate the connections between the different parts of the clone and connect the fine roots and the aboveground plant parts. How much energy do meadow plants devote to these functions in the form of biomass invested in rhizomes? Can rhizome biomass be predicted using the plant traits of species occurring in the community? We tried to answer these and other questions by analyzing 52 meadow communities, which were either intensively or extensively managed. We found that the plant traits allow us to predict the distribution of plant community biomass only in extensively managed meadows. The reason was the low production of rhizomes in plants from intensively managed meadows and this could also be responsible for the change of ecosystem functions in case of too intensive management in grassland ecosystems. The loss of rhizomatous species and the associated loss of rhizome functions such as carbon sequestration in soil, clone integration and soil erosion protection can be a mechanism that leads to the degradation of intensively used grasslands in arid areas and deserve therefore further attention.

  • Klimešová J., Mudrák O., Martínková J., Lisner A., Lepš J., Filartiga A. L. & Ottaviani G. 2021: Are belowground clonal traits good predictors of ecosystem functioning in temperate grasslands? Functional Ecology 35, 787 – 795. doi:10.1111/1365-2435.13755
  • Ottaviani G., Lubbe F. C., Lepš J., Lisner A., Martínková J., Mudrák O. & Klimešová J. 2021: Strong impact of management regimes on rhizome biomass across Central European temperate grasslands. Ecological Applications 31, 1 – 5. doi:10.1002/eap.2317

Louky lišící se intenzitou obhospodařování.

Meadows with varying intensity of management. The intensity of management and the biomass of the rhizomes increase from the top to the bottom.

 

2/ Carbon storage in meadow plants and its relationship to plant economy

The concept of the plant’s economic spectrum, which is very popular in functional ecology, still lacks a link to carbon storage, and research has focused mainly on the photosynthetic efficiency of the leaf under conditions of varying resource availability. We tried to find out whether the properties of the leaves in which carbon is assimilated are coordinated with the properties of the underground organs of herbs in which carbon is stored. We used anatomical traits, morphological traits, and data on the type and concentration of storage carbohydrates to describe the properties of storage organs. Based on the analysis of 40 meadow species, we found that the economic traits of the leaves are weakly coordinated with the traits of the storage organs and that the two groups of traits are independent of each other and therefore represent independent strategies within the plant’s economic spectrum.

  • Lubbe F. C., Klimeš A., Doležal J., Jandová V., Mudrák O., Janeček Š., Bartušková A. & Klimešová J. 2021: Carbohydrate storage in herbs: the forgotten functional dimension of the plant economic spectrum. Annals of Botany 127, 813 – 825. doi:10.1093/aob/mcab014

 

Schéma možných vztahů mezi skupinami ekonomických vlastností listů a podzemních zásobních orgánů.

Scheme of possible relationships between economic leaf traits and traits of belowground storage organs.

 

3/ Evolution of clonal growth forms in angiosperms

Plants are propagated by seeds, however, many plants also propagate clonally using stolons, rhizomes or roots. Although clonality is common in plants, it has been paid little research attention; we do not know how it changed during evolution or what what functions it can provide. We sought this by phylogenetic analysis of approx. 3000 species of European flora. It showed great evolutionary flexibility of clonality. Plants thus can flexibly attain its functions when the environment requires it, and get rid of it just as easily.

Rozmanitost orgánů klonálního rozmnožování u rostlin
Diversity of clonal reproduction organs in plants. Plants can fairly easily switch among individual types of clonal reproduction, just as they can easily lose altogether or regain it back.

  • Herben, T.; Klimešová, J. (2020). Evolution of clonal growth forms in angiosperms. New Phytologist 225: 999–1010. doi: 10.1111/nph.16188

4/ How clonal and non-clonal plants cope with severe disturbance?

Generally, clonal plants are expected to deal with disturbance more successfully than non-clonal plants. It is because they have larger bud bank(from which new shoots are resprouting), and storage of carbohydrates (that fuels biomass reestablishment). In a garden experiment with 17 congeneric pairs differing by clonality, we applied various types of severe disturbance, for example cutting of aboveground parts, freezing and flooding. We found that both groups of plants have the same ability to regrow. Both groups, however, use specific strategies in coping with disturbance and this may lead to a different response later in their life. Clonal plants invest more energy to regenerating organs, non-clonal plants build more effective acquisitive ones, i.e. leaves and fine roots.

Skleníkový pokus studující strategie klonálních a neklonálních rostlin
Greenhouse experiment studying strategies of clonal vs non-clonal plants. Photo by J. Martínková

  • Martínková, J., Klimeš, A., Puy, J., & Klimešová, J. 2020. Response of clonal versus non-clonal herbs to disturbance: Different strategies revealed. Perspectives in Plant Ecology, Evolution and Systematics 44: 125529. doi: 10.1016/j.ppees.2020.125529
  • Martínková, J., Klimeš, A., & Klimešová, J. 2020. Young clonal and non-clonal herbs differ in growth strategy but not in aboveground biomass compensation after disturbance. Oecologia 193: 925–935. doi: 10.1007/s00442-020-04724-7

5/ Turions as a source of nitrogen, phosphorus and carbon for spring growth

Turions are dormant buds serving aquatic plants for overwintering, usually at the bottom of the water body. We investigated the content of resources needed for their spring regrowth and whether they differ according to ecological group of plants (carnivorous/non-carnivorous; rooting in depth/free floating, etc.) We found out that turions store preferentially starch that is partly consumed during winter. Turions are able to allocate about 40 % of total N and 60 % of total P to support the growth of new organs in spring. Photosynthetic pigment content is sufficient to ensure the high net photosynthetic rate of germinating turions. We did not support the hypothesis that storage of resources and their mobilization from turions differ among ecological groups of aquatic plants.

Zralé turiony bublinatky obecné
 Mature turions of common bladderwort (Utricularia vulgaris) can be up to 25 mm large. Photo by L. Adamec

  • Adamec, L., Kučerová, A., & Janeček, Š. 2020. Mineral nutrients, photosynthetic pigments and storage carbohydrates in turions of 21 aquatic plant species. Aquat. Bot. 165: e103238. doi: 10.1016/j.aquabot.2020.103238