绳索域的边界3通过调节皮质合成来调节盐分的耐受性
Rongqing Miao1, Qinghua Yang1, Wei Xiang1
1Key Laboratory of Saline-Alkali Vegetation Ecology Restoration, Ministry of Education, College of Life Sciences, Northeast Forestry University, Harbin, China.
Plant, cell & environment
|November 21, 2025
概括
一个新的基因,绳索域3 (BDR3) 的边界,负面调节了植物的盐耐受性. 它的突变通过增加皮质和减少水损失来增强耐盐性,为作物改进提供了新的途径.
科学领域:
- 植物生物学 植物生物学
- 分子遗传学 分子遗传学
- 生物化学 生物化学
背景情况:
- 土壤盐度对全球农业构成重大威胁,影响植物生长和发展.
- 鉴定植物耐盐性关键遗传调节因子对于通过基因工程开发耐盐作物至关重要.
- 控制盐耐受机制的特定基因在很大程度上仍然没有表征.
研究的目的:
- 通过基因选,识别参与植物盐耐受性的新型基因.
- 为了阐明已识别的基因,绳索域3 (BDR3) 的边界在盐应激反应中的功能.
- 了解BDR3影响植物适应盐度的分子机制.
主要方法:
- 进行了基于土壤的基因选,以分离耐盐性突变物.
- 确定了"对盐1的耐受性" (tos1) 突变的因果基因BDR3.3.
- 在盐应激下分析了BDR3缺乏突变体的生理和生化变化,包括离子积累,透气率和皮质成分.
- 研究了受BDR3影响的酶活性和代谢途径.
主要成果:
- 隔离了一种耐盐性突变,tos1,具有增强的盐耐药性和独特的叶子形态.
- 将tos1突变定位到功能性未表征的基因BDR3.
- 证明BDR3缺乏导致皮质积累增加 (VLCFA,),Na+积累减少,透气减少.
- 表明BDR3缺乏脂酶活性,但影响脂肪酸代谢,促进合成和加强皮质维护.
- 在tos1突变体中观察到增强的甘油脂水解和脂肪酸重新分配到合成.
结论:
- BDR3作为植物盐耐受性的新型负调节剂.
- 通过其在生物合成和脂肪酸代谢重编程中的作用,BDR3控制皮质透气和离子平衡.
- 这些发现为改善生物合成调节和提高作物中的植物盐耐受性提供了分子基础.
相关概念视频
Responses to Salt Stress
14.4K
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.
14.4K
Riboswitches
9.5K
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
9.5K
Biosynthesis of Lipids
499
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
499
Regulation of Transpiration by Stomata
30.8K
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.
30.8K
Transcriptional Regulation: Riboswitches
535
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
535
Adaptations that Reduce Water Loss
27.9K
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.
27.9K


