Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery

Eucalyptus globulus Labill is one of the most planted species in Chile, because of its fast growth and superior pulp qualities. Nevertheless, the incidence of drought and frost damage immediately after planting is frequent. The purpose of this work was to study the effect of drought hardening on fro...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Coopman,Rafael E, Jara,Jorge C, Escobar,Rene, Corcuera,Luis J, Bravo,Leon A
Lenguaje:English
Publicado: Pontificia Universidad Católica de Valparaíso 2010
Materias:
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100005
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
id oai:scielo:S0717-34582010000100005
record_format dspace
spelling oai:scielo:S0717-345820100001000052010-04-28Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nurseryCoopman,Rafael EJara,Jorge CEscobar,ReneCorcuera,Luis JBravo,Leon A biomass allocation cross hardening genotypic selection planting stock quality water stress Eucalyptus globulus Labill is one of the most planted species in Chile, because of its fast growth and superior pulp qualities. Nevertheless, the incidence of drought and frost damage immediately after planting is frequent. The purpose of this work was to study the effect of drought hardening on frost resistance and on variations in morphological traits that may increase drought resistance at nursery phase in four genotypes of E. globulus Labill. Drought hardening treatments consisted in induced water stress by watering restriction, until pre-dawn stem xylem water potentials (Ψpd) reached -0.2, -1.8 and -2.6 MPa. Two water stress-rewatering cycles were applied during 54 days of hardening. Plant and root biomasses were affected by the interaction of drought hardening and genotypes. The rest of morphological and alometrical traits were affected independently by drought or genotype. Plant height, leaf area, specific leaf area (SLA), stem, and leaf biomasses decreased with drought hardening, while collar diameter was not affected. Genotypes responded differentially to drought hardening in plant height, leaf area, SLA, and stem, and leaf biomasses. Ice nucleation temperature (INT), and freezing temperatures (FRT), and 50% freezing damage index of leaves (LT50) were affected by the interaction between drought hardening and genotypes. EG-13, EG-23 and EG-22 genotypes became freezing tolerant with drought hardening (-2.6 MPa). Additionally, EG-14 genotype increased its freezing resistance at -1.8 MPa. Therefore, freezing resistance levels and mechanism depend on genotype and drought hardening treatment. The success in tree breeding by genetic selection should be facilitated by improved understanding of the physiology of stress resistance development and survival during water supply limitations. The knowledge of morphological and freezing resistance dependency on the interaction between genotype and drought hardening may be useful nursery management information to improve plantation success.info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.13 n.1 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100005en10.4067/S0717-34582010000100005
institution Scielo Chile
collection Scielo Chile
language English
topic biomass allocation
cross hardening
genotypic selection
planting stock quality
water stress
spellingShingle biomass allocation
cross hardening
genotypic selection
planting stock quality
water stress
Coopman,Rafael E
Jara,Jorge C
Escobar,Rene
Corcuera,Luis J
Bravo,Leon A
Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
description Eucalyptus globulus Labill is one of the most planted species in Chile, because of its fast growth and superior pulp qualities. Nevertheless, the incidence of drought and frost damage immediately after planting is frequent. The purpose of this work was to study the effect of drought hardening on frost resistance and on variations in morphological traits that may increase drought resistance at nursery phase in four genotypes of E. globulus Labill. Drought hardening treatments consisted in induced water stress by watering restriction, until pre-dawn stem xylem water potentials (Ψpd) reached -0.2, -1.8 and -2.6 MPa. Two water stress-rewatering cycles were applied during 54 days of hardening. Plant and root biomasses were affected by the interaction of drought hardening and genotypes. The rest of morphological and alometrical traits were affected independently by drought or genotype. Plant height, leaf area, specific leaf area (SLA), stem, and leaf biomasses decreased with drought hardening, while collar diameter was not affected. Genotypes responded differentially to drought hardening in plant height, leaf area, SLA, and stem, and leaf biomasses. Ice nucleation temperature (INT), and freezing temperatures (FRT), and 50% freezing damage index of leaves (LT50) were affected by the interaction between drought hardening and genotypes. EG-13, EG-23 and EG-22 genotypes became freezing tolerant with drought hardening (-2.6 MPa). Additionally, EG-14 genotype increased its freezing resistance at -1.8 MPa. Therefore, freezing resistance levels and mechanism depend on genotype and drought hardening treatment. The success in tree breeding by genetic selection should be facilitated by improved understanding of the physiology of stress resistance development and survival during water supply limitations. The knowledge of morphological and freezing resistance dependency on the interaction between genotype and drought hardening may be useful nursery management information to improve plantation success.
author Coopman,Rafael E
Jara,Jorge C
Escobar,Rene
Corcuera,Luis J
Bravo,Leon A
author_facet Coopman,Rafael E
Jara,Jorge C
Escobar,Rene
Corcuera,Luis J
Bravo,Leon A
author_sort Coopman,Rafael E
title Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
title_short Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
title_full Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
title_fullStr Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
title_full_unstemmed Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
title_sort genotypic variation in morphology and freezing resistance of eucalyptus globulus seedlings subjected to drought hardening in nursery
publisher Pontificia Universidad Católica de Valparaíso
publishDate 2010
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100005
work_keys_str_mv AT coopmanrafaele genotypicvariationinmorphologyandfreezingresistanceofeucalyptusglobulusseedlingssubjectedtodroughthardeninginnursery
AT jarajorgec genotypicvariationinmorphologyandfreezingresistanceofeucalyptusglobulusseedlingssubjectedtodroughthardeninginnursery
AT escobarrene genotypicvariationinmorphologyandfreezingresistanceofeucalyptusglobulusseedlingssubjectedtodroughthardeninginnursery
AT corcueraluisj genotypicvariationinmorphologyandfreezingresistanceofeucalyptusglobulusseedlingssubjectedtodroughthardeninginnursery
AT bravoleona genotypicvariationinmorphologyandfreezingresistanceofeucalyptusglobulusseedlingssubjectedtodroughthardeninginnursery
_version_ 1718441807697674240