植物生理学论文--低温对植物光合作用影响.pptVIP

Impacts of chilling temperatures on photosynthesis in warm-climate plants 低温对热带植物光合作用的影响 Trends in Plant Science, Volume 6, Issue 1, 1 January 2001, Pages 36-42 167940010 张东芳 Abstract Photosynthesis in warm-climate plants is substantially reduced after chilling. Tropical and subtropical species offer the opportunity to study the effects of low temperature on photosynthetic processes undisguised by the myriad of protective responses observed in temperate species. In this article, we highlight the primary components of photosynthesis that are affected by a short chill, in both the dark and the light, and discuss what is known of the mechanisms involved. Recent work implicates impaired redox and circadian regulation among other processes. 在低温处理的情况下，热带植物的光合作用效率大幅降低。热带和亚热带的物种为我们研究低温对各物种光合作用过程的影响提供一个机会。在这篇文章中，我们强调由一个短暂的低温处理和黑暗或光照的组合影响的光合作用，并讨论什么是已知参与的机制。最近的研究发现其中包括氧化还原受损和昼夜调控。 Keywords/关键字 Low temperature; Photoinhibition; Oxidative stress; Carbon reduction cycle; Circadian rhythm 低温;光抑制;氧化应激;减碳循环;昼夜节律 Low temperature is a major factor limiting the productivity and geographical distribution of many species, including important agricultural crops. The formation of ice inside plant cells is devastating. Freeze-tolerant plants have several strategies to reduce the probability of this occurring, even when air temperature drops below zero, including maintaining high intracellular solute concentrations and encouraging ice nucleation outside the cells. These plants also commonly exhibit xerophytic adaptations to survive the reduced water availability within the plant and the soil. Temperatures of ?5°C can kill an unhardened winter wheat plant even though it has the genetic capacity to acclimatize, harden and acquire tolerance of freezing down to ?20°C. The cold-hardening mechanisms conferring freeze tolerance have been described elsewhere. and include changes in lipid composition, increases in active-