叶类植物中的高光合作用率是由叶子解剖学调解的,使其具有高的生化能力,快速的CO2扩散和高效的光线使用
Moges A Retta1, Leen Van Doorselaer2, Steven M Driever1
1Centre for Crop Systems Analysis, Wageningen University & Research, PO Box 430, 6700 AK, Wageningen, the Netherlands.
The New phytologist
|September 19, 2024
概括
布拉西卡系的一些物种表现出高的光合作用率. 叶子解剖学和二氧化碳扩散适应是促进植物二氧化碳同化和农业生产率的关键.
科学领域:
- 植物生理学 植物生理学
- 农业科学 农业科学
- 植物解剖学 植物解剖学
背景情况:
- 布拉西卡家族包含具有高光合作用率的物种,为农业改进提供了潜力.
- 驱动这些高光合作用率的因素在很大程度上是未知的.
研究的目的:
- 研究导致Brassicaceae物种高光合作用率的生理和解剖因素.
- 为了比较光合作用效率和适应光强度的适应反应,在选定的白科物种和Arabidopsis thaliana.
主要方法:
- 在不同的光强度下对Hirschfeldia incana,Brassica nigra,Brassica rapa和Arabidopsis thaliana进行比较分析.
- 评估光合作用速率,最大光合作用能力和中粒细胞导电性.
- 检查叶子的解剖特征和叶绿素的分布.
主要成果:
- 在强光下,Hirschfeldia incana,Brassica nigra和Brassica rapa表现出高的光合作用率,其表现优于Arabidopsis thaliana.
- 光合作用限制有所不同,最大容量限制了H. incana和B. rapa,而中粒细胞导电能力限制了A. thaliana和B. nigra.
- 叶子的特征,如厚度和杆细胞密度,影响了中菌的导电性;在高光和低光下种植的植物之间,菌的分布有所不同.
结论:
- 叶子解剖学促进二氧化碳扩散和光的使用,结合高光合作用能力,对于高二氧化碳同化率至关重要.
- 叶子结构和光适应性中的特定物种适应对于优化白植物的光合作用至关重要.
更多相关视频
10:20Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
Published on: August 9, 2019
12.6K
10:46Evaluation of Photosynthetic Efficiency in Photorespiratory Mutants by Chlorophyll Fluorescence Analysis
Published on: December 9, 2022
1.9K
相关概念视频
01:46The Calvin Benson Cycle
4.5K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.5K
02:16Light 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
01:27C4 Pathway and CAM
45.3K
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...
45.3K
01:57Adaptations that Reduce Water Loss
25.2K
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.
25.2K
01:42The Antenna Complex
5.9K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency...
5.9K
01:40The Calvin Cycle
73.7K
Overview
73.7K