脂质合成酶维持了雅思蒙酸合成的代谢流量,以调节根生长和酸盐平衡
Mandavi Pandey1, Lokesh Verma1, Pawandeep Singh Kohli1
1National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
Plant physiology
|August 27, 2024
概括
米中的酸盐缺乏会引发脂质变化,影响根生长. OsDGD1酶对于维持莉酸 (JA) 水平至关重要,在低酸条件下,对于健康的根部发育至关重要.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 植物需要酸盐 (Pi) 才能生长,但土壤稀缺是常见的.
- 缺乏导致膜脂质的变化,将脂类替换为银河脂类和硫脂类.
- 银河脂质的比例 (单银河酸酸糖醇,MGDG;二银河酸酸糖醇,DGDG) 可能会影响莉酸 (JA) 生物合成.
研究的目的:
- 研究DGDG合成酶1 (OsDGD1) 在缺乏Pi的根发育中的作用.
- 澄清MGDG:DGDG比率,JA水平和根生长之间的协调.
- 了解OsDGD1如何维持JA生物合成的代谢流量.
主要方法:
- OsDGD1基因的表征及其通过酸盐饥饿反应的调节 2.
- 对OsDGD1淘汰赛 (KO) 米线的表型分析.
- 脂质组分析以量化银河脂质水平.
- 测量内源性JA和auxin水平的测量.
主要成果:
- OsDGD1表达是由低Pi诱导的,并由酸盐饥饿反应2调节.
- OsDGD1 KO线路的根长,生物量和Pi吸收都减少了.
- KO线显示DGDG减少,膜重塑发生变化,MGDG:DGDG比率增加.
- 在KO线路中增加MGDG:DGDG比率会导致JA水平和信号的升高,通过auxin不平衡导致根生长抑制.
结论:
- OsDGD1对于在Pi缺乏期间保持最佳JA水平至关重要,促进大米的根生长.
- 这项研究揭示了脂质作为植物激素生物合成的代谢流量控制器的新型作用,超出了信号和结构功能.
相关概念视频
Cell Signaling in Plants
5.6K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
5.6K
C4 Pathway and CAM
45.4K
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...
45.4K
The Apoplast and Symplast
50.2K
Plant growth depends on its ability to take up water and dissolved minerals from the soil. The root system of every plant is equipped with the necessary tissues to facilitate the entry of water and solutes. The plant tissues involved in the transport of water and minerals have two major compartments - the apoplast and the symplast. The apoplast includes everything outside the plasma membrane of living cells and consists of cell walls, extracellular spaces, xylem, phloem, and tracheids. The...
50.2K
Regulation of Transpiration by Stomata
27.9K
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.
27.9K
Water and Mineral Acquisition
32.7K
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.
32.7K
Morphogenesis
27.8K
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.
27.8K


