在T-FACE环境中,面温度解释了大米基因型对二氧化碳升高和温度升高的不同产量反应
Haozheng Li1,2, Liping Shao1,3, Hongying Tang1
1College of Agriculture, Nanjing Agricultural University, Nanjing, China.
Journal of experimental botany
|April 24, 2025
概括
增加的二氧化碳 (CO2) 会增加大米产量,而高温会降低产量. 印第卡大米 (Yangdao6) 显示出比日本大米 (Changyou5) 更强大的产量抗压力.
科学领域:
- 农业科学 农业科学
- 植物生理学 植物生理学
- 气候变化生物学 气候变化生物学
背景情况:
- 大气中二氧化碳 (CO2) 的增加和气温的上升对全球农业构成了复杂的挑战.
- 米 (Oryza sativa) 的产量对二氧化碳升高和高温都很敏感,因基因型而异.
- 了解压力反应的基因型差异对于开发适应气候的米品种至关重要.
研究的目的:
- 为了研究 CO2 升高和高温在不同基因型的水产量之间的相互作用.
- 根据未来的气候情景,确定与避免压力和耐受米相关的特定特征.
- 为了比较日本大米和印加大米亚种对模拟气候变化条件的反应.
主要方法:
- 使用温度通过空气 CO2 丰富 (T-FACE) 系统来模拟环境和升高的 CO2 (590 μmol mol-1) 和天花板温度 (+2.0 °C).
- 在两个生长季节中评估了两种对比的水基因型:Japonica (Changyou5) 和Indica (Yangdao6).
- 评估了关键的生理和与产量相关的参数,包括谷物产量,叶子和花中的含量,光转换效率,花生育率,收获指数和花温度.
主要成果:
- 升高的二氧化碳完全弥补了高温对阳台6 (印加) 谷物产量的负面影响,产量增加了20.0%.
- 在高二氧化碳和高温条件下,宇5 (日本) 的产量下降了7.8%.
- 由于叶子中的含量更高,光转换效率更高,道6表现出优越的性能,并且至关重要的是,它保持了较高的尖端生育率和收获指数,这与在开花期间的较低的尖端温度有关.
结论:
- 基因型变异显著影响了大米对二氧化碳升高和高温压力的抵抗力.
- 印加基因型Yangdao6表现出优异的产量稳定性,归因于生理特征,如早期开花,更高的气用于透气冷却,并保持了尖生育能力.
- 这些已识别的基因型特征为旨在在不断变化的气候下提高大米产量稳定性的育种计划提供了有价值的目标.
相关概念视频
Responses 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
Responses 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
C4 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
Adaptations that Reduce Water Loss
25.0K
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.
25.0K
Responses to Salt Stress
12.8K
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.
12.8K
Light Acquisition
8.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.4K


