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231223s2006 xx ||||| 00| ||eng c |
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Reyes-Díaz, Marjorie
|e verfasserin
|4 aut
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|a Arabidopsis thaliana avoids freezing by supercooling
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 27.02.2007
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|a Date Revised 21.11.2008
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Arabidopsis thaliana (L.) Heynh. has been described as a freezing-tolerant species based on freezing-resistance assays. Nonetheless, this type of experiment does not discriminate between freezing-tolerance and freezing-avoidance mechanisms. The purpose of this paper was to determine which of these two freezing-resistance mechanisms is responsible for freezing resistance in A. thaliana. This was achieved by comparing the thermal properties (ice-nucleation temperature and the freezing temperature) of leaves and the lethal temperature to 10, 50 and 90% of the plants (LT10, LT50, and LT90, respectively). Two wild-type genotypes were used (Columbia and Ler) and their mutants (esk-1 and frs-1, respectively), which differ in their freezing resistance. This study's results indicated that the mutant esk-1, described as a freezing-tolerant species showed freezing tolerance only after a cold-acclimation period. The mutant frs-1, described as freezing sensitive, presented freezing avoidance. Both wild genotypes presented LT50 similar to or higher than the ice-nucleation temperature. Thus, the main freezing-resistance mechanism for A. thaliana is avoidance of freezing by supercooling. No injury of the photosynthetic apparatus was shown by measuring the maximal photochemical efficiency (Fv/Fm) and pigments (chlorophyll and carotenoid) during cold acclimation in all genotypes. During cold acclimation, Columbia and esk-1 increased total soluble carbohydrates in leaves. esk-1 was the only genotype that presented freezing tolerance after cold acclimation. This feature could be related to an increase in sugar accumulation in the apoplast
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Ice
|2 NLM
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|a Pigments, Biological
|2 NLM
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|a Ulloa, Nancy
|e verfasserin
|4 aut
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|a Zúñiga-Feest, Alejandra
|e verfasserin
|4 aut
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|a Gutiérrez, Ana
|e verfasserin
|4 aut
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|a Gidekel, Manuel
|e verfasserin
|4 aut
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|a Alberdi, Miren
|e verfasserin
|4 aut
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|a Corcuera, Luis J
|e verfasserin
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|a Bravo, León A
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 57(2006), 14 vom: 01., Seite 3687-96
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
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|g volume:57
|g year:2006
|g number:14
|g day:01
|g pages:3687-96
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