Treatment Analogous to Seasonal Change Demonstrates the Integration of Cold Responses in Brachypodium distachyon.,Plant Physiology

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Treatment Analogous to Seasonal Change Demonstrates the Integration of Cold Responses in Brachypodium distachyon.
Plant Physiology ( IF 6.5 ) Pub Date : 2019-12-16 , DOI: 10.1104/pp.19.01195
Boris F Mayer ₁ , Annick Bertrand ₂ , Jean-Benoit Charron ₃

Affiliation

Anthropogenic climate change precipitates the need to understand plant adaptation. Crucial in temperate climates, adaptation to winter is characterized by cold acclimation and vernalization, which respectively lead to freezing tolerance and flowering competence. However, the progression of these responses during fall and their interaction with plant development are not completely understood. By identifying key seasonal cues found in the native range of the cereal model Brachypodium distachyon, we designed a diurnal-freezing treatment (DF) that emulates summer-to-winter change. DF induced unique cold acclimation and vernalization responses characterized by low VERNALIZATION1 (VRN1) expression. Flowering under DF is characterized by an up-regulation of FLOWERING LOCUS T (FT) postvernalization independent of VRN1 expression. DF, while conferring flowering competence, favors a high tolerance to freezing and the development of a winter-hardy plant structure. The findings of this study highlight the contribution of phenotypic plasticity to freezing tolerance and demonstrate the integration of key morphological, physiological, and molecular responses in cold adaptation. The results suggest a fundamental role for VRN1 in regulating cold acclimation, vernalization, and morphological development in B. distachyon This study also establishes the usefulness of reproducing natural cues in laboratory settings.

中文翻译：

类似于季节性变化的治疗方法证明了短枝曲霉病中冷反应的整合。

人为的气候变化促使人们需要了解植物的适应性。在温带气候中至关重要，适应冬季的特征是冷驯化和春化，分别导致耐寒性和开花能力。然而，这些反应在秋季的进程及其与植物发育的相互作用尚不完全清楚。通过识别谷物模型Brachypodium distachyon的本地范围中发现的关键季节性线索，我们设计了模拟夏季到冬季变化的昼间冻结处理（DF）。DF诱导以VERNALIZATION1（VRN1）低表达为特征的独特的冷驯化和春化响应。DF下开花的特征是春化后的FLOWERING LOCUS T（FT）上调，而与VRN1表达无关。DF，在赋予开花能力的同时，还要求对冷冻具有很高的耐受性，并发展出耐寒的植物结构。这项研究的结果突出了表型可塑性对耐寒性的贡献，并证明了冷适应过程中关键形态，生理和分子反应的整合。结果表明VRN1在调节B. distachyon的冷驯化，春化和形态发育中起着基本作用。这项研究还建立了在实验室环境中繁殖自然线索的有用性。和冷适应中的分子反应。结果表明VRN1在调节B. distachyon的冷驯化，春化和形态发育中起着基本作用。这项研究还建立了在实验室环境中繁殖自然线索的有用性。和冷适应中的分子反应。结果表明VRN1在调节B. distachyon的冷驯化，春化和形态发育中起着基本作用。这项研究还建立了在实验室环境中繁殖自然线索的有用性。

更新日期：2020-01-31

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