湿度作为缓解低温压力的关键因素:热水条件对玉米出现的影响
Yang HuiYing1,2, Gao Pan1,2, Xu YingYing1,2
1Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, China.
PloS one
|February 23, 2026
概括
半干旱地区的玉米发芽受到寒风的挑战. 最佳的土壤水分水平,特别是超过80%的田间容量,可以显著减轻冷却压力,并在低温下改善苗木的出现.
科学领域:
- 农业科学 农业科学
- 植物生理学 植物生理学
- 适应气候变化 适应气候变化
背景情况:
- 气候变化增加了暴风雨的频率,威胁到半干旱地区的早期玉米 (Zea mays L.) 播种.
- 寒冷的温度和不均的土壤湿度会对玉米苗的出现和发展产生负面影响.
- 确定关键温度和湿度值对于在脆弱的农业环境中成功发芽至关重要.
研究的目的:
- 在模拟的早春条件下确定玉米发芽的临界温度和土壤湿度值.
- 量化冷却时间,最低温度和土壤水分对关键发芽指标的影响.
- 为了确定影响玉米苗木建立的环境因素之间的相互作用.
主要方法:
- 在一个受控环境的因数实验中,将玉米种子暴露在日间温度周期中.
- 处理包括五种最低温度 (0-8°C),三种冷却时间 (2-6小时) 和四种土壤水分水平 (60-90%的田间容量).
- 发芽速度,发芽时间,同步,延迟日和苗木干物被分析使用三向ANOVA和Pearson相关性.
主要成果:
- 低于6°C的最低温度显著延迟了发芽,并降低了最终的发芽率,特别是在低湿的情况下.
- 土壤湿度水平达到80%的田间容量,并且在中等温度 (4-6°C) 上有减轻的冷却效应.
- 最低温度和土壤湿度表现出最强的相互作用,显著影响了发芽和苗木干物质.
结论:
- 土壤水分作为一个重要的缓冲对抗冷却压力在玉米发芽期间的作用.
- 温度和湿度组合的定量基准可以优化半干旱地区的早期玉米的出现.
- 精确的湿度管理对于提高玉米对春季极端天气事件的抵抗力至关重要.
相关概念视频
02:45Responses to Heat and Cold Stress
15.0K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
15.0K
02:41Responses to Drought and Flooding
12.2K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
12.2K
01:27Factors Influencing Microbial Growth: Temperature
1.5K
Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
1.5K
01:57Adaptations that Reduce Water Loss
28.3K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
28.3K
02:02Responses to Salt Stress
14.8K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
14.8K