沿着明显的热带降雨梯度,干旱耐受性的有限的内属变化
Liza S Comita1,2, F Andrew Jones2,3, Eric J Manzané-Pinzón2,4
1The Forest School, Yale School of the Environment, Yale University, New Haven, CT 06511.
概括
热带树种在抗旱能力方面表现出有限的物种内变异,尽管物种之间存在很大差异. 这表明干旱.
科学领域:
- 生态生态学 生态生态学
- 气候变化生物学 气候变化生物学
- 植物科学 植物科学
背景情况:
- 了解干旱应对的种内变化对于预测热带树种适应气候变化的预测至关重要.
- 热带树木干旱反应的物种内变异实验数据很少.
研究的目的:
- 为了评估16种热带树种在降雨梯度中对水的可用性做出反应的物种内变化.
- 调查功能特征和基因流动在抗旱能力中的作用.
- 评估物种适应变化的水资源的适应能力.
主要方法:
- 进行了相互移植和共同花园实地实验.
- 测量了干旱抗性和功能特征的特定变化.
- 分析了基因流和种子在不同水条件下的表现.
主要成果:
- 在降雨梯度上发现的干旱抵抗性物种内部变化的证据很少.
- 大多数测量的功能特征没有显著的物种内特异变化.
- 来自干燥和湿的苗木在干旱下表现相似,但来自湿的苗木在湿条件下生存率更高.
结论:
- 干旱显著影响潮湿的热带森林中的物种组成,但对物种内部变异的影响有限.
- 功能性特征的内部变异似乎不是这些热带树种抗旱能力的主要驱动因素.
- 除了直接干旱压力之外的其他因素,例如昆虫草食,可能会影响幼苗的生存和表现.
更多相关视频
06:35Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce Lactuca sativa Germplasm Collections
Published on: April 17, 2015
9.0K
12:11Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM
Published on: December 31, 2012
37.4K
相关概念视频
02:41Responses to Drought and Flooding
10.7K
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.
10.7K
01:57Adaptations that Reduce Water Loss
25.5K
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.
25.5K
02:45Responses to Heat and Cold Stress
13.4K
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.
13.4K
02:02Responses to Salt Stress
13.1K
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.
13.1K
02:04Regulation of Transpiration by Stomata
28.2K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
28.2K
02:22Introduction to Plant Diversity
44.6K
From Water to Land
44.6K