Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species

Myrceugenia exsucca (DC.) O.Berg (Myrtaceae) and Luma chequen (Molina) A. Gray (Myrtaceae) are two predominants species from swamp forests of Chile. These species present differential microhabitat distribution across soil moisture and north-south precipitation gradients, with only L. chequen being c...

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Autores principales:	Bascuñán-Godoy,Luisa, Alcaíno,Claudia, Carvajal,Danny Eduardo, Sanhueza,Carolina, Montecinos,Sonia, Maldonado,Antonio
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2013
Materias:	Thermal dissipation water potential native plants Myrtaceae family wetland plants
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200008
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spelling	oai:scielo:S0717-664320130002000082014-05-07Different photoprotective responses under drought conditions of two predominant Chilean swamp forest speciesBascuñán-Godoy,LuisaAlcaíno,ClaudiaCarvajal,Danny EduardoSanhueza,CarolinaMontecinos,SoniaMaldonado,Antonio Thermal dissipation water potential native plants Myrtaceae family wetland plants Myrceugenia exsucca (DC.) O.Berg (Myrtaceae) and Luma chequen (Molina) A. Gray (Myrtaceae) are two predominants species from swamp forests of Chile. These species present differential microhabitat distribution across soil moisture and north-south precipitation gradients, with only L. chequen being commonly found in lower moisture sites. It is hypothesized that L. chequen has greater plasticity than M. exsucca in the attributes involved in photoprotection under drought conditions. To test this hypothesis: both species were exposed to short term drought treatment. A group of individuals was maintained irrigated (with <img border=0 width=41 height=36 id="_x0000_i1084" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg">of -0.58 and -0.73 MPa for M. exsucca and L. chequen, respectively), while another group was exposed to drought treatment with <img border=0 width=41 height=36 id="_x0000_i1083" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg">around -1.4 MPa (<img border=0 width=41 height=36 id="_x0000_i1082" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg"> D). High relationship was founded between relative water content (RWC) and water potential (<img border=0 width=41 height=36 id="_x0000_i1081" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg">) forM. exsucca (r²= 0.74) more than for L. chequen (r²= 0.46), indicating thatM. exsucca experienced larger dehydration during the drought treatment. As functional attributes of photosynthetic apparatus, amount of total chlorophyll and chlorophyll a fluorescence parameter levels were studied in both species. The results show that L. chequen reduced total content of chlorophylls and maximum efficiency of PSII (Fv / Fm) related to decrease of energy capture increasing significantly the thermal dissipation (qN). On the other hand, M. exsucca does not change these parameters, but significantly reduced the level of photochemical processes (qL), indicating an energy imbalance. The results indicate M. exsucca has less plasticity than L. chequen under drought conditions. It is believed that these differences may be crucial in the establishment period and may be influencing the limited distribution ofM. exsucca in sites with lower water availability.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.70 n.2 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200008en10.4067/S0717-66432013000200008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Thermal dissipation water potential native plants Myrtaceae family wetland plants
spellingShingle	Thermal dissipation water potential native plants Myrtaceae family wetland plants Bascuñán-Godoy,Luisa Alcaíno,Claudia Carvajal,Danny Eduardo Sanhueza,Carolina Montecinos,Sonia Maldonado,Antonio Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
description	Myrceugenia exsucca (DC.) O.Berg (Myrtaceae) and Luma chequen (Molina) A. Gray (Myrtaceae) are two predominants species from swamp forests of Chile. These species present differential microhabitat distribution across soil moisture and north-south precipitation gradients, with only L. chequen being commonly found in lower moisture sites. It is hypothesized that L. chequen has greater plasticity than M. exsucca in the attributes involved in photoprotection under drought conditions. To test this hypothesis: both species were exposed to short term drought treatment. A group of individuals was maintained irrigated (with <img border=0 width=41 height=36 id="_x0000_i1084" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg">of -0.58 and -0.73 MPa for M. exsucca and L. chequen, respectively), while another group was exposed to drought treatment with <img border=0 width=41 height=36 id="_x0000_i1083" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg">around -1.4 MPa (<img border=0 width=41 height=36 id="_x0000_i1082" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg"> D). High relationship was founded between relative water content (RWC) and water potential (<img border=0 width=41 height=36 id="_x0000_i1081" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg" alt="http://fbpe/img/gbot/v70n2/art08-for1.jpg">) forM. exsucca (r²= 0.74) more than for L. chequen (r²= 0.46), indicating thatM. exsucca experienced larger dehydration during the drought treatment. As functional attributes of photosynthetic apparatus, amount of total chlorophyll and chlorophyll a fluorescence parameter levels were studied in both species. The results show that L. chequen reduced total content of chlorophylls and maximum efficiency of PSII (Fv / Fm) related to decrease of energy capture increasing significantly the thermal dissipation (qN). On the other hand, M. exsucca does not change these parameters, but significantly reduced the level of photochemical processes (qL), indicating an energy imbalance. The results indicate M. exsucca has less plasticity than L. chequen under drought conditions. It is believed that these differences may be crucial in the establishment period and may be influencing the limited distribution ofM. exsucca in sites with lower water availability.
author	Bascuñán-Godoy,Luisa Alcaíno,Claudia Carvajal,Danny Eduardo Sanhueza,Carolina Montecinos,Sonia Maldonado,Antonio
author_facet	Bascuñán-Godoy,Luisa Alcaíno,Claudia Carvajal,Danny Eduardo Sanhueza,Carolina Montecinos,Sonia Maldonado,Antonio
author_sort	Bascuñán-Godoy,Luisa
title	Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
title_short	Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
title_full	Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
title_fullStr	Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
title_full_unstemmed	Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
title_sort	different photoprotective responses under drought conditions of two predominant chilean swamp forest species
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200008
work_keys_str_mv	AT bascunangodoyluisa differentphotoprotectiveresponsesunderdroughtconditionsoftwopredominantchileanswampforestspecies AT alcainoclaudia differentphotoprotectiveresponsesunderdroughtconditionsoftwopredominantchileanswampforestspecies AT carvajaldannyeduardo differentphotoprotectiveresponsesunderdroughtconditionsoftwopredominantchileanswampforestspecies AT sanhuezacarolina differentphotoprotectiveresponsesunderdroughtconditionsoftwopredominantchileanswampforestspecies AT montecinossonia differentphotoprotectiveresponsesunderdroughtconditionsoftwopredominantchileanswampforestspecies AT maldonadoantonio differentphotoprotectiveresponsesunderdroughtconditionsoftwopredominantchileanswampforestspecies
_version_	1718442289712332800

Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species

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