Sap Flow Measurements in a Socotra Dragon's Blood Tree (Dracaena cinnabari) in its Area of Origin

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F18%3A43914225" target="_blank" >RIV/62156489:43410/18:43914225 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s12042-018-9204-4" target="_blank" >https://doi.org/10.1007/s12042-018-9204-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12042-018-9204-4" target="_blank" >10.1007/s12042-018-9204-4</a>

Result language

angličtina

Original language name

Sap Flow Measurements in a Socotra Dragon's Blood Tree (Dracaena cinnabari) in its Area of Origin

Original language description

For the first time, in situ field measurements of sap flow were conducted in adult Dracaena cinnabari plant native to the arid tropical climate of Socotra Island. The heat field deformation (HFD) method was applied using both single and multi-point sensors to study azimuthal and radial sap flow variability in stem, roots and first-order branches over two weeks during a winter monsoon. The main aim of this work was to monitor sap flow in adult D. cinnabari in-situ to better understand its physiological adaptation to extreme arid environments. The second aim was to compare our results with earlier sap flow measurements in adult D. draco uing the same HFD method. The last question we wanted to answer was comparison of sap flow measurements in both, young and adult Dracaena species. We found that sap flow magnitude is low and of a similar range in all observed D. species. High sap flow variability was recorded in different parts of adult D. cinnabari plant which changed throughout the day responding to interplay between intrinsic and extrinsic water potential gradients induced by sunlight. Maximum sap flow levels had variable pattern around stem in response to sun exposure, similarly as it was observed in adult D. draco plant. Sensors installed tangentially in stem xylem showed that water transport in adult D. cinnabari may move in lateral direction. This work also presents several methodological aspects detected from earlier observations of dicots which proved to be more pronounced in adult D. species. These methodologies relate to interpreting negative sap flow rates in conjunction with established axial flow reversal during hydraulic redistribution usually occurring under low evaporative demands and dry soil. Conversely, flow reversal during the day under high evaporative demands and wet soil may designate lateral water movement induced by internal water redistribution.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10611 - Plant sciences, botany

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Tropical Plant Biology

ISSN

1935-9756

e-ISSN

—

Volume of the periodical

11

Issue of the periodical within the volume

3-4

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

107-118

UT code for WoS article

000450632900002

EID of the result in the Scopus database

2-s2.0-85047105284