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Freezing treatment under light conditions leads to a dramatic enhancement of freezing tolerance in cold-acclimated Arabidopsis.
Sugita, Kenji; Takahashi, Shunsuke; Uemura, Matsuo; Kawamura, Yukio.
Afiliación
  • Sugita K; The United Graduate School of Agricultural and Sciences, Iwate University, Morioka, Iwate, Japan.
  • Takahashi S; Department of Plant-bioscience, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan.
  • Uemura M; The United Graduate School of Agricultural and Sciences, Iwate University, Morioka, Iwate, Japan.
  • Kawamura Y; Department of Plant-bioscience, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan.
Plant Cell Environ ; 47(8): 2971-2985, 2024 Aug.
Article en En | MEDLINE | ID: mdl-38630014
ABSTRACT
Overwintering plants survive subzero temperatures by cold acclimation (CA), wherein they acquire freezing tolerance through short-term exposure to low temperatures above 0°C. The freezing tolerance of CA plants increases when they are subsequently exposed to mild subzero temperatures, a phenomenon known as second-phase cold hardening (2PH). Here, we explored the molecular mechanism and physiological conditions of 2PH. The results show that, compared with supercooling, a freezing treatment during 2PH after CA enhanced the freezing tolerance of Arabidopsis. This required CA as a pretreatment, and was designated as second-phase freezing acclimation (2PFA). Light increased the effect of 2PFA to enhance freezing tolerance after CA. C-repeat binding factor and cold-regulated genes were downregulated by light during the 2PFA treatment, a different transcription profile from that during CA. The freezing tolerance of 2PFA plants was decreased by the presence of the photosynthetic electron transfer inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethylurea during the 2PFA treatment. Compared with wild-type plants, phototropin1,2 and phyb mutants showed lower freezing tolerance after 2PFA treatment. These results show that exposure to freezing after CA increases freezing tolerance as a secondary process, and that freezing under light conditions further increases freezing tolerance via pathways involving photoreceptors and photosynthetic electron transfer.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arabidopsis / Regulación de la Expresión Génica de las Plantas / Proteínas de Arabidopsis / Congelación / Aclimatación / Luz Idioma: En Revista: Plant Cell Environ Asunto de la revista: BOTANICA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arabidopsis / Regulación de la Expresión Génica de las Plantas / Proteínas de Arabidopsis / Congelación / Aclimatación / Luz Idioma: En Revista: Plant Cell Environ Asunto de la revista: BOTANICA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos