Repositorio UFRO · Omeka S

How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants?

Primer Autor	Bravo, Leon A.
Co-autores	Lopez, Dariel Sanhueza, Carolina Salvo-Garrido, Haroldo Bascunan-Godoy, Luisa
Título	How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants?
Editorial	MDPI
Revista	PLANTS-BASEL
Lenguaje	en
Resumen	The Antarctic Peninsula has rapidly warmed up in past decades, and global warming has exhibited an asymmetric trend, therefore, it is interesting to understand whether nocturnal or diurnal warming is the most relevant for plant cold deacclimation. This study aimed to evaluate the effect of diurnal and nocturnal warming on Antarctic vascular plant's freezing resistance under laboratory conditions. This was studied by measuring the lethal temperature for 50% of tissue (LT50), ice nucleation temperature (INT), and freezing point (FP) on Deschampsia antarctica and Colobanthus quitensis plants. Additionally, soluble carbohydrates content and dehydrin levels were analyzed during nocturnal and diurnal temperatures increase. Nocturnal warming led to a 7 degrees C increase in the LT50 of D. antarctica and reduced dehydrin-like peptide expression. Meanwhile, C. quitensis warmed plants reduce their LT50 to about 3.6 degrees C. Both species reduce their sucrose content by more than 28% in warming treatments. Therefore, nocturnal warming leads to cold deacclimation in both plant species, while C. quitensis plants are also cold-deacclimated upon warm days. This suggests that even when the remaining freezing resistance of both species allows them to tolerate summer freezing events, C. quitensis can reach its boundaries of freezing vulnerability in the near future if warming in the Antarctic Peninsula progress.
Fecha Publicación	2023
Tipo de Recurso	artículo original
doi	10.3390/plants12040806
Formato Recurso	PDF
Palabras Claves	asymmetric warming climate change Colobanthus quitensis Deschampsia antarctica freezing resistance night temperature supercooling
Ubicación del archivo	http://dx.doi.org/10.3390/plants12040806
Categoría OCDE	Ciencias de las plantas
Materias	calentamiento asimétrico cambio climático Colobanthus quitensis Deschampsia antártida resistencia al congelamiento temperatura nocturna sobreenfriamiento
Identificador del recurso (Mandatado-único)	artículo original
Versión del recurso (Recomendado-único)	versión publicada
License	CC BY 4.0
Condición de la licencia (Recomendado-repetible)	CC BY 4.0
Derechos de acceso	acceso abierto
Access Rights	acceso abierto
Id de Web of Science	WOS:000940531500001
Tipo de ruta	verde# dorado
Categoría WOS	Ciencias de las plantas
Referencia del Financiador (Mandatado si es aplicable-repetible)	ANID-FONDECYT 1151173 ANID 2017-21170470 NEXER UFRO NXR17-0002 INACH RT 18-18 ANID FONDECYT 1151173 NEXER Universidad de La Frontera (UFRO) NXR17-0002