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@article{1392935,
author = {Jupa, Radek and Plichta, Roman and Paschová, Zuzana and Nadezhdina, Nadezhda and Gebauer, Roman},
article_location = {OXFORD},
article_number = {9},
doi = {http://dx.doi.org/10.1093/treephys/tpx072},
keywords = {hydraulic capacitance; non-structural carbohydrates; sap flow; stomatal conductance; water potential; xylem},
language = {eng},
issn = {0829-318X},
journal = {Tree Physiology},
title = {Mechanisms underlying the long-term survival of the monocot Dracaena marginata under drought conditions},
volume = {37},
year = {2017}
}
TY - JOUR
ID - 1392935
AU - Jupa, Radek - Plichta, Roman - Paschová, Zuzana - Nadezhdina, Nadezhda - Gebauer, Roman
PY - 2017
TI - Mechanisms underlying the long-term survival of the monocot Dracaena marginata under drought conditions
JF - Tree Physiology
VL - 37
IS - 9
SP - 1182-1197
EP - 1182-1197
PB - OXFORD UNIV PRESS
SN - 0829318X
KW - hydraulic capacitance
KW - non-structural carbohydrates
KW - sap flow
KW - stomatal conductance
KW - water potential
KW - xylem
N2 - Efficient water management is essential for the survival of vascular plants under drought stress. While interrelations among drought stress, plant anatomy and physiological functions have been described in woody dicots, similar research is very limited for non-palm arborescent and shrubby monocots despite their generally high drought tolerance. In this study, potted transplants of Dracaena marginata Lam. in primary growth stage were exposed to several short-and long-term drought periods. Continuous measurements of sap flow and stem diameter, the evaluation of capacitance and leaf conductance, the quantification of nonstructural carbohydrates (NSC), and organ-specific anatomical analyses were performed to reveal the mechanisms promoting plant resistance to limited soil moisture. The plants showed sensitive stomata regulation in the face of drying soil, but only intermediate resistance to water loss through cuticular transpiration. The water losses were compensated by water release from stem characterized by densely interconnected, parenchyma-rich ground tissue and considerable hydraulic capacitance. Our results suggest that the high concentration of osmotically active NSC in aboveground organs combined with the production of root pressures supported water uptake and the restoration of depleted reserves after watering. The described anatomical features and physiological mechanisms impart D. marginata with high resistance to irregular watering and long-term water scarcity. These findings should help to improve predictions with respect to the impacts of droughts on this plant group.
ER -
JUPA, Radek, Roman PLICHTA, Zuzana PASCHOVÁ, Nadezhda NADEZHDINA and Roman GEBAUER. Mechanisms underlying the long-term survival of the monocot Dracaena marginata under drought conditions. \textit{Tree Physiology}. OXFORD: OXFORD UNIV PRESS, 2017, vol.~37, No~9, p.~1182-1197. ISSN~0829-318X. Available from: https://dx.doi.org/10.1093/treephys/tpx072.
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