温度升高和二氧化碳诱导可塑性,并对植物特征施加新的选择
Derek A Denney1,2, Jill T Anderson3,4
1Department of Plant Biology, University of Georgia, Athens, GA 30602 USA.
Integrative and comparative biology
|May 8, 2025
概括
气候变化影响植物的特征和选择. 虽然根质量分数等特征中的一些可塑性是适应性的,但其他可塑性,如叶子干物质含量,可能会降低适应性. 在气候变化下出现新的选择模式.
科学领域:
- 植物生态学植物生态学
- 进化生物学 进化生物学
- 气候变化生物学 气候变化生物学
背景情况:
- 气候变化正在增加大气中的二氧化碳 ([CO2]) 和全球气温.
- 这些变化可以影响植物的特征,它们的地理变异 (clines) 和自然选择.
- 了解这些相互作用对于预测植物对未来气候反应至关重要.
研究的目的:
- 研究大气中二氧化碳 ([CO2]) 的升高和温度如何相互作用,影响Boechera stricta.的生态相关特征.
- 检查这些气候因素对特征线和自然选择对植物形态学和表观学的影响.
- 评估表型可塑性在应对气候变化的适应意义.
主要方法:
- 进行了一项多因素生长室实验,使用来自广的海拔梯度的多种Boechera stricta接入.
- 植物暴露于不同水平的温度和大气中的二氧化碳 ([CO2]).
- 测量和分析了生态相关的特征,clines和自然选择在形态学和现象学上.
主要成果:
- 根质量分数中的塑料转移与选择的开花概率保持一致,这表明适应性可塑性.
- 叶子干物质含量的可塑性与选择不一致,表明了潜在的不适应性.
- 选择有利于在高[CO2]下更高的特定叶面积和在环境[CO2]下更低的特定叶面积,这与一些预期相反. 温暖的温度延长了开花的时间,选择有利于这种可塑性.
结论:
- 气候变化可能会对植物特征施加新的和不可预测的自然选择模式.
- 在某些特征中,表型可塑性可能是对气候变化压力的不适应反应.
- 了解特征特异性可塑性和选择对于预测未来气候情景下的植物社区动态至关重要.
相关概念视频
02:45Responses to Heat and Cold Stress
13.2K
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.
13.2K
01:27C4 Pathway and CAM
45.0K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
45.0K
02:19Morphogenesis
23.4K
Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
23.4K
01:10Transcription
146.0K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
146.0K
02:41Responses to Drought and Flooding
10.5K
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.
10.5K
01:59Plant Breeding and Biotechnology
18.5K
Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
18.5K