来自寒冷气候地区的Juniperus virginiana在寒冷的适应过程中保持了可溶性糖与粉的较高比例
Samuel C Harbol1, Randall W Long2, Juliana S Medeiros1
1Department of Research and Conservation, Holden Arboretum, 9500 Sperry Rd, Kirtland, OH 44094, USA.
Tree physiology
|September 22, 2023
概括
植物调整非结构性碳水化合物 (NSC) 度以适应寒冷 (CA). 南方人口的糖含量较高,而寒冷气候的植物保持了更好的糖粉比率.
科学领域:
- 植物生理学 植物生理学
- 环境应激反应环境应激反应
- 木质植物生态学 木质植物生态学
背景情况:
- 非结构性碳水化合物 (NSCs) 扮演着不同的角色,使它们对环境压力的反应变得复杂.
- 由于代谢需求降低 (如干旱,寒冷),可溶性糖可以积累,或具有保护功能 (冷保护,透调节).
- 扩张的木质植物Juniperus virginiana是研究环境压力下的NSC动态的一个模型.
研究的目的:
- 调查Juniperus virginiana中NSC度是否受到来自寒冷/干旱气候和温暖/潮湿气候的来源的影响.
- 评估干旱和寒冷适应 (CA) 对NSC度和寒冷强度的影响.
- 将J. virginiana种群和Juniperus scopulorum之间的NSC分配策略进行比较.
主要方法:
- 在环境梯度上收集了J. virginiana种群和J. scopulorum.
- 在一个共同的花园里种植植物,并将它们 subjected to drought and cold acclimation treatments. 在一个共同的花园里种植植物,并将它们 subjected to drought and cold acclimation treatments. 在一个共同的花园里种植植物,并将它们 subjected to drought 和冷适应治疗.
- 在整个CA期间测量了NSC度 (糖,粉) 和冷硬度.
主要成果:
- 来自更温暖,更南方的植物最初不那么耐寒,但随着时间的推移而适应.
- 干旱没有显著影响NSC度,可能是由于J. virginiana固有的干旱耐受性.
- 在CA期间,NSC度增加,主要是作为糖,南方人口的糖分水平最高.
- 来自寒冷气候地区的植物在CA期间保持了较高的糖粉比.
结论:
- NSCs对于Juniperus物种的寒冷适应 (CA) 是至关重要的.
- 环境起源影响生理对寒冷和光周期变化的反应.
- 不同的NSC分配,特别是糖与粉的比例,是适应不同气候和寒冷压力的关键.
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