缺乏OST1的植物在高VPD时表现出有条件的口腔关闭和野生类型的生长敏感性
Ingmar Tulva1, Mikk Välbe1, Ebe Merilo1
1Institute of Technology, University of Tartu, Tartu, Estonia.
Physiologia plantarum
|October 26, 2023
概括
气候变化增加了蒸汽压力缺陷 (VPD),影响了植物. 该研究发现,与野生类型相比,OST1功能丧失突变体显示有条件的口腔关闭,在高VPD下增长的敏感性没有增加.
科学领域:
- 植物生理学 植物生理学
- 气候变化生物学
- 分子植物科学 分子植物科学
背景情况:
- 由于气候变化导致大气蒸气压缺陷 (VPD) 的上升,增加了植物的透气,减少了植物的生长.
- 在高VPD下,Arabidopsis的口腔关闭受SnRK2.6 (OPEN STOMATA 1, OST1) 激酶的调节.
研究的目的:
- 在各种条件下研究高VPD诱导的口腔关闭在OST1功能丧失突变 (ost1-3) 中.
- 评估ABA依赖和OST1独立激活在VPD反应中的作用.
- 确定高VPD对与野生类型 (Col-0) 相比,ost1-3突变体的罗塞特生长和生物量的影响.
主要方法:
- 气体交换测量以评估口腔导电性.
- 叶子水潜在分析. 叶子水潜在分析.
- 罗塞特面积和生物质测量以评估植物生长.
主要成果:
- 水的 ost1-3 胃口对高VPD不敏感,但缺水灌的 ost1-3 胃口表现出最大的水位下降和胃口关闭.
- 在 ost1-3 和修改后的 OST1 线之间的口腔关闭的差异表明 OST1 的逐渐的 ABA-独立激活由 VPD.
- 高VPD同样减少了花区和特定叶面积,在得到良好灌的ost1-3和Col-0植物中;花干质不受影响.
结论:
- OST1功能丧失突变体在高VPD的反应中表现出有条件的口腔关闭,这取决于水的可用性.
- 与高VPD下的野生类型相比, ost1-3突变体在花区生长中没有增强的灵敏度.
- 这些发现突出了由OST1.1对口腔对VPD反应的复杂,有条件的调节.
相关概念视频
Regulation of Transpiration by Stomata
28.3K
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.
28.3K
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
Responses to Heat and Cold Stress
13.5K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.5K
Responses to Salt Stress
13.2K
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.
13.2K
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
Tonicity in Plants
30.7K
Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
30.7K


