Water transport secrets of the dragon’s blood trees revealed through sap flow measurements following partial stem incision
| Autor: | Nadezhda Nadezhdina, Valerij Nadezhdin, Roman Gebauer, Roman Plichta |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Water transport Ecology biology Water flow Xylem Plant Science biology.organism_classification Vascular bundle 010603 evolutionary biology 01 natural sciences Horticulture Ground tissue Dracaena cinnabari Dracaena draco Dracaena Ecology Evolution Behavior and Systematics 010606 plant biology & botany |
| Zdroj: | Flora. 250:44-51 |
| ISSN: | 0367-2530 |
| DOI: | 10.1016/j.flora.2018.11.015 |
| Popis: | Dragon’s blood trees have long been prized for their red resin, and are consequently subjected to traditional practices for its harvesting which involves inflicting numerous, deep stem wounds. Nevertheless, these iconic monocots have continued to survive such drastic treatments. Partial stem incision (PSI) treatment effectively imitates stem wounding, which when combined with sap flow measurements monitored in a close distance of few centimeters above PSI, may significantly improve our understanding of water transport efficiency after stem damage in monocots. As it is impossible to conduct these experiments on protected adult Dracaena species native to remote sites, we demonstrated this approach on young Dracaena draco L. and Dracaena cinnabari Balfour f. plants ex-situ. The goal of this study was to simulate the effects of serious stem wounding on water transport of these woody monocots by applying PSI under permanent sap flow monitoring by the heat field deformation (HFD) method using multi-point sensors. This allowed us to simultaneously monitor sap flow in both wounded and intact stem parts. It was observed that PSI applied in stems up to one-half of the total stem diameter did not reduce sap flow in D. species in any of the monitored stem part indicating efficient bypassing interrupted axial xylem transport by lateral water movement. The dense three dimensional network of interconnected vascular bundles and abundant ground tissue with large simple pits could play an important role in such high transport effectivity of Dracaena species. Synchronous sap flow and nuclear magnetic resonance measurements would be especially useful for the revealing of water flow complexity of Dracaena species in future. |
| Databáze: | OpenAIRE |
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