环球时钟协会1调节类水果中干旱引起的酸和糖的积累
Junfeng Yang1,2, Xiaochuan Ma1,3, Qian Zhu1,2
1College of Horticulture, Hunan Agricultural University, 410128, Changsha, China.
The Plant journal : for cell and molecular biology
|March 1, 2026
概括
的昼夜时钟基因CsCCA1增强了水果酸盐和糖的积累,改善了对干旱的耐受性. 该基因调节了参与营养物质运输和真空存储的关键因素.
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:
- 果的质量受到酸和糖的积累的影响,而酸和糖的积累则受到干旱压力等环境因素的影响.
- 循环时钟基因在调节植物生长和发育方面发挥着至关重要的作用,但它们在压力下对类水果代谢的具体参与尚未完全理解.
研究的目的:
- 研究类生态时钟基因CIRCADIAN CLOCK ASSOCIATED 1 (CsCCA1) 在调节类水果质量,特别是干旱压力下的酸盐和糖积累中的作用.
- 阐明CsCCA1影响类植物营养积累和干旱耐受性的分子机制.
主要方法:
- 在不同条件下对类植物中CsCCA1的基因表达分析.
- 通过树组织和异质系统 (番茄) 的过度表达和沉默,对CsCCA1的功能分析.
- 促进者分析以确定CsCCA1结合点和监管目标 (AN1,SUT1).
主要成果:
- CsCCA1表现出昼夜节律性,并积极调节酸盐和糖 (糖,果糖,葡萄糖) 在类水果中的积累.
- 过度表达CsCCA1增加了酸盐和糖的水平,而沉默降低了它们,提高了类的干旱耐受性.
- CsCCA1直接与ANTHOCYANIN 1 (AN1) 和糖运输体1 (SUT1) 的促进区域结合,调节酸盐和糖运输.
结论:
- 昼夜钟基因CsCCA1是类水果质量的关键调节者,协调干旱应激反应与必需代谢物的积累.
- CsCCA1对AN1和SUT1的调节为增强酸盐和糖含量提供了分子基础,有助于改善水果特性和应激弹性.
相关概念视频
Biological Clocks and Seasonal Responses
41.8K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
41.8K
Circadian Rhythms and Gene Regulation
4.6K
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
4.6K
Adaptations that Reduce Water Loss
28.4K
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.
28.4K
Regulation of Transpiration by Stomata
31.6K
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.
31.6K
C4 Pathway and CAM
49.7K
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...
49.7K
Fruit Development, Structure, and Function
25.6K
Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
25.6K


