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本文以2个玉米品种‘陕单609’(抗旱性强)和‘陕单902’(抗旱性弱)为材料,采用盆栽控水方式,通过叶绿素荧光诱导动力学曲线和820 nm光反射曲线测定分析了干旱胁迫10d及复水10d对2个玉米品种光系统电子传递特性的影响。结果显示,随着干旱胁迫程度的加剧,‘陕单609’和‘陕单902’的叶片光系统Ⅱ(PSⅡ)、光系统Ⅰ(PSⅠ)以及两个光系统间电子传递的活性均下降,但‘陕单609’光合电子传递参数下降幅度较‘陕单902’小。复水后‘陕单902’从PSⅡ供体侧到PSⅠ末端受体侧的光合电子传递活性恢复缓慢,而‘陕单609’的能够快速恢复到对照水平。这些结果表明,与‘陕单902’相比,‘陕单609’在干旱胁迫和复水处理下能较好地协调PSⅡ和PSⅠ电子传递变化,这种自我保护机制维持了光合系统的稳定性,是其适应干旱环境的重要生理原因。
In this paper, two maize cultivars, Shaandan 609 (strong drought resistance) and Shaandan 902 (drought resistance weak) were used as materials to control the chlorophyll fluorescence-induced kinetic curve and 820 nm light reflectance curve The effects of drought stress 10 d and rehydration 10 d on the phototransmitter properties of two maize cultivars were analyzed. The results showed that the leaf photosystem Ⅱ (PSⅡ), photosystem Ⅰ (PSⅠ) and the electron transfer activity between the two photosynthetic systems of ’Shaandan 609’ and ’Shandan 902’ decreased with the severity of drought stress, However, the photosynthetic electron transfer parameters of Shandan 609 decreased less than Shaandan 902. After rehydration, the photosynthetic electron transport activity of ’Shandan 902’ from the PSⅡ donor side to the PSⅠ-terminal receptor side recovered slowly, while that of ’Shaandan609’ quickly recovered to the control level. These results indicate that ’Shandan 609’ can better coordinate the electron transport changes of PSⅡ and PSⅠ under the conditions of drought stress and rehydration, which maintains the stability of photosynthetic system , Is an important physiological reason for its adaptation to arid environment.