该HIC信号通路将二氧化碳感知与口腔发育联系起来
J E Gray1, G H Holroyd, F M van der Lee
1Department of Molecular Biology and Biotechnology, University of Sheffield, UK.
Nature
|December 29, 2000
概括
科学家们确定了Arabidopsis HIC基因,这是口腔发育的关键调节者. 这一发现解释了植物如何根据大气中二氧化碳水平上升而调整口腔密度.
科学领域:
- 植物生物学 植物生物学
- 环境科学 环境科学
- 遗传学 是一个遗传学.
背景情况:
- 胃孔调节二氧化碳的吸收和水的流失,这对植物的生存和光合作用至关重要.
- 自工业革命以来,植物口腔密度随着大气二氧化碳的上升而下降,这表明对人为气候变化的反应.
- 化石记录显示,在4亿多年的时间里,口腔密度和二氧化碳之间存在反向相关性,这为过去的气候和灭绝事件提供了洞察力.
研究的目的:
- 为了确定负责调节口腔发育的基因,以应对二氧化碳水平升高.
- 阐明植物感知和响应大气二氧化碳度变化的分子机制.
主要方法:
- 对表现出改变口腔发育的Arabidopsis thaliana突变物进行遗传分析.
- 鉴定和描述HIC基因及其编码的蛋白质.
- 在不同二氧化碳度下对突变植物进行表型分析.
主要成果:
- 阿拉比多普西斯HIC (高二氧化碳) 基因被确定为口腔发育的负调节者.
- HIC编码了一个假定的3-酸辅酶A合成酶,参与脂肪酸合成.
- 在二氧化碳翻倍的条件下,突变植物的口腔密度显著增加 (高达42%).
结论:
- 该HIC基因在植物的信号传导途径中发挥着关键作用,用于控制CO2升高时的口腔数量.
- 这一发现为了解植物适应大气二氧化碳度变化的分子基础.
- 这项研究将植物对气候变化的生理反应与特定的遗传机制联系起来.
相关概念视频
C4 Pathway and CAM
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...
Regulation of Transpiration by Stomata
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.
The Calvin Benson Cycle
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...
Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
Cell Signaling in Plants
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...
Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...


