根系架构的构成基础:发现一种有希望的特征,用于培育营养和抗干旱的作物
Zhigang Liu1, Tongfei Qin1, Michaella Atienza1
1Global Institute for Food Security, University of Saskatchewan, Saskatoon, SK S7N 4L8 Canada.
aBIOTECH
|December 18, 2023
概括
种SC103表现出构成性根系架构 (RSA),可以增强营养和水的吸收. 这种强大的RSA在充足条件和限制条件下改善了生长,为开发弹性作物提供了战略.
科学领域:
- 植物生物学和农业学
- 遗传学和作物改进
背景情况:
- 根系架构 (RSA) 对于营养和水的获取至关重要,特别是在变化的土壤条件下.
- 根的可塑性使植物能够适应异质的营养分布,以实现最佳的生长.
研究的目的:
- 为了研究构成性RSA在不同营养和水的可用性下对生长的作用.
- 为了比较 (P) 有效 (SC103) 和P无效 (BTx635) 的品种的性能.
主要方法:
- 在足够和缺乏P, (N) 和水的条件下,对SC103和BTx635的根和芽生长的比较分析.
- 根特征的表型特征,包括根系大小和侧根发育.
主要成果:
- 与BTx635相比,SC103始终表现出更大根系,具有更多和更长的横根,导致增强的射击生物质.
- 在P缺乏,N缺乏和干旱压力下,SC103保持了优越的生长性能.
- 虽然这两种品种最初在P缺乏下增加了横向根部发育,但SC103保留了更大的根生物质.
结论:
- 构成性RSA,以SC103为例,在各种环境压力下为生长提供了显著的优势.
- SC103固有的RSA为育种营养和耐旱的 Sorghum 品种提供了一个有价值的特征.
相关概念视频
Responses 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
Water and Mineral Acquisition
33.1K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
33.1K
Adaptations that Reduce Water Loss
25.6K
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.
25.6K
Epiphytes, Parasites, and Carnivores
13.0K
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
13.0K
C4 Pathway and CAM
45.5K
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...
45.5K
Responses 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


