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Acquisition of Freezing Tolerance in Vaccinium macrocarpon Ait. Is a Multi-Factor Process Involving the Presence of an Ice Barrier at the Bud Base.
Villouta, Camilo; Workmaster, Beth Ann; Livingston, David P; Atucha, Amaya.
Afiliação
  • Villouta C; Arnold Arboretum of Harvard University, Boston, MA, United States.
  • Workmaster BA; Department of Horticulture, University of Wisconsin-Madison, Madison, WI, United States.
  • Livingston DP; Department of Crop and Soil Sciences, USDA-ARS and North Carolina State University, Raleigh, NC, United States.
  • Atucha A; Department of Horticulture, University of Wisconsin-Madison, Madison, WI, United States.
Front Plant Sci ; 13: 891488, 2022.
Article em En | MEDLINE | ID: mdl-35599888
ABSTRACT
Bud freezing survival strategies have in common the presence of an ice barrier that impedes the propagation of lethally damaging ice from the stem into the internal structures of buds. Despite ice barriers' essential role in buds freezing stress survival, the nature of ice barriers in woody plants is not well understood. High-definition thermal recordings of Vaccinium macrocarpon Ait. buds explored the presence of an ice barrier at the bud base in September, January, and May. Light and confocal microscopy were used to evaluate the ice barrier region anatomy and cell wall composition related to their freezing tolerance. Buds had a temporal ice barrier at the bud base in September and January, although buds were only freezing tolerant in January. Lack of functionality of vascular tissues may contribute to the impedance of ice propagation. Pith tissue at the bud base had comparatively high levels of de-methyl-esterified homogalacturonan (HG), which may also block ice propagation. By May, the ice barrier was absent, xylogenesis had resumed, and de-methyl-esterified HG reached its lowest levels, translating into a loss of freezing tolerance. The structural components of the barrier had a constitutive nature, resulting in an asynchronous development of freezing tolerance between anatomical and metabolic adaptations.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article