When the Mediterranean becomes harsh: Heat pulses strongly affect C allocation in plant-soil-atmosphere continuum in Eucalyptus camaldulensis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F19%3A00507742" target="_blank" >RIV/86652079:_____/19:00507742 - isvavai.cz</a>

Výsledek na webu

<a href="https://reader.elsevier.com/reader/sd/pii/S0098847218316563?token=AE7EB4F6FEADECE14B89968B813A299664EEF4A782FE7679CE45EC56CF4A2574BA50548661B927D35B5A1EEE0D585B29" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0098847218316563?token=AE7EB4F6FEADECE14B89968B813A299664EEF4A782FE7679CE45EC56CF4A2574BA50548661B927D35B5A1EEE0D585B29</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.envexpbot.2019.02.019" target="_blank" >10.1016/j.envexpbot.2019.02.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

When the Mediterranean becomes harsh: Heat pulses strongly affect C allocation in plant-soil-atmosphere continuum in Eucalyptus camaldulensis

Popis výsledku v původním jazyce

Mediterranean vegetation is frequently subjected to the heat waves with temperature peaks exceeding 45 degrees C. While the effects of drought on assimilates allocation are deeply studied, little information is available regarding the effects of the acute heat stress on this aspect of the plant physiology. We evaluated the effects of acute heat pulses on plant C internal allocation in Eucalyptus camaldulensis saplings and its transfer into the soil. Shoots of Eucalyptus were subjected to an increase of the air temperatures up to 45 degrees C. Allocation of C was inferred after pulse labelling of heated and non-heated shoots with (CO2)-C-13 . Heat pulse lowered the photosynthesis and almost tripled the C losses from shoots through respiration. Assimilated C-13 was preferentially allocated to leaf soluble sugar fractions rather than to starch. Heat pulse interrupted C-13 allocation to the trunk, roots and soil. C-13 allocation to new non labelled leaves was detected in some replicate plants, independently of treatment, suggesting that this process is sink-driven. Although, shoots subjected to the heat pulse modified allocation strategy, 'saving' assimilated C-13 at a leaf level, the rate of C-13 involvement in shoot respiration was restricted by photosynthetic rates measured during the labelling. The results suggest that photosynthetic and non-photosynthetic organs may be constrained to rely on C reserves under elevated temperatures with further negative consequences for C balance in case the duration and frequency of the heat waves will increase as projected by climate change.

Název v anglickém jazyce

When the Mediterranean becomes harsh: Heat pulses strongly affect C allocation in plant-soil-atmosphere continuum in Eucalyptus camaldulensis

Popis výsledku anglicky

Mediterranean vegetation is frequently subjected to the heat waves with temperature peaks exceeding 45 degrees C. While the effects of drought on assimilates allocation are deeply studied, little information is available regarding the effects of the acute heat stress on this aspect of the plant physiology. We evaluated the effects of acute heat pulses on plant C internal allocation in Eucalyptus camaldulensis saplings and its transfer into the soil. Shoots of Eucalyptus were subjected to an increase of the air temperatures up to 45 degrees C. Allocation of C was inferred after pulse labelling of heated and non-heated shoots with (CO2)-C-13 . Heat pulse lowered the photosynthesis and almost tripled the C losses from shoots through respiration. Assimilated C-13 was preferentially allocated to leaf soluble sugar fractions rather than to starch. Heat pulse interrupted C-13 allocation to the trunk, roots and soil. C-13 allocation to new non labelled leaves was detected in some replicate plants, independently of treatment, suggesting that this process is sink-driven. Although, shoots subjected to the heat pulse modified allocation strategy, 'saving' assimilated C-13 at a leaf level, the rate of C-13 involvement in shoot respiration was restricted by photosynthetic rates measured during the labelling. The results suggest that photosynthetic and non-photosynthetic organs may be constrained to rely on C reserves under elevated temperatures with further negative consequences for C balance in case the duration and frequency of the heat waves will increase as projected by climate change.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10611 - Plant sciences, botany

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Environmental and Experimental Botany

ISSN

0098-8472

e-ISSN

—

Svazek periodika

162

Číslo periodika v rámci svazku

jun

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

181-191

Kód UT WoS článku

000467507700018

EID výsledku v databázi Scopus

2-s2.0-85062228379