3种不同树种光呼吸变化特征及在光防御中的作用研究

• 作 者: 张莹 田有亮 刘焱 何炎红
• 机 构: 内蒙古农业大学林学院,包头市园林科技研究所,
• 出 处: 内蒙古农业大学学报(自然科学版)
• 发表日期: 2014年01期
• 关键词: 沙冬青 呼吸速率 光呼吸 NPQ 光照强度 栒子 光胁迫 光保护 响应曲线 辽东栎

运用LI-6400光合-荧光测定仪测定沙冬青、辽东栎和栒子的光呼吸响应曲线、光呼吸/总光合响应曲线及光呼吸—NPQ曲线。结果表明,在低光胁迫时光呼吸速率和光呼吸速率/总光合速率迅速增加,高光胁迫时变化缓慢,变化的转折处定义为临界点,由此判断树种光呼吸的耗能作用依次为沙冬青>辽东栎>栒子,树种对光照强度的敏感程度为辽东栎>栒子>沙冬青;在强光胁迫下光呼吸和热耗散机制同时在光破坏防御保护机制中起作用,两者之间存在协同关系。

The photorespiration-response curve and photorespiration-NPQ curve of Astragalus-mongolica, Quercus liaotungensis and Prunus triloba were determined by LI-6400 photosynthesis-fluorescence detector. The results showed that the light respiration rate and photosynthetic rate / photosynthetic rate increased rapidly under low light stress, but changed slowly under high light stress. The turning point of the change was defined as the critical point. Quercus liaotungensis> Rutaceae, the sensitivity of tree species to light intensity was Quercus liaotungensis> Rugosa> Salvia formosa. The mechanism of photorespiration and heat dissipation under light stress played a role in the mechanism of light damage defense and protection. There is a synergistic relationship.