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光呼吸是植物绿色组织在光照条件下吸收氧气和放出二氧化碳的过程,其现象与呼吸相似。但因其受光的促进,因而称为光呼吸。光呼吸与暗呼吸(一般的呼吸)在本质上是完全不同的两种生理过程。光呼吸局限在绿色组织中,只在光下进行。其过程是把光合作用的一个中间产物(乙醇酸)氧化分解成二氧化碳,但放出的能量不能被植物利用而白白消耗掉。叶片的暗呼吸强度一般只占其光合强度的5～10％,而光呼吸强度则大得多,有些植物(如三碳植物)差不多把光合作用制造的有机碳的20～40％通过光呼吸变成了二氧化碳,从而大大降低了净光合强度,限制了生物产量的提高。因此,人们在努力寻找各种能降低光呼吸强度的措施。据研究,植物的类型不同,光呼吸强度也不同。四碳植物的光呼吸强度只是三碳植物的2～5％,
Photorespiration is the process by which plant green tissues absorb oxygen and emit carbon dioxide under light conditions. The phenomenon is similar to that of respiration. However, due to the promotion of light, so called light breathing. Light breathing and dark breathing (general breathing) are essentially two different physiological processes. Respiration is confined to green tissue and occurs only in light. The process is to oxidize and decompose an intermediate product (glycolic acid) of photosynthesis into carbon dioxide, but the energy released can not be consumed by plants and consumed in vain. Dark respiration of leaves generally accounts for only 5 to 10% of their photosynthetic intensity, while photorespiration is much greater. Some plants (eg, three-carbon plants) pass almost 20 to 40% of photosynthesis-producing organic carbon through photorespiration Into carbon dioxide, which greatly reduces the net photosynthetic intensity, limiting the biological yield increase. Therefore, people are trying to find various measures that can reduce the intensity of light breathing. According to the study, different types of plants, light intensity is also different. Four-carbon plant photorespiration intensity is only three to five percent of plants,