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目的:研究不同水分胁迫方式对牛扁光合光响应特性的影响,为牛扁在干旱地区的开发利用提供依据。方法:采用固定单侧水分胁迫(T1)、分区交替水分胁迫(T2)与对照两侧同时供水(T3)处理牛扁移栽苗3个“供水-胁迫”周期,各周期末测定相关指标。结果:交替水分胁迫下:①Pn在试验末期高于对照6.53%,显著高于T1处理,影响光合速率的因素以非气孔因素为主;②Tr和Gs分别低于对照15.61%,10.96%,WUE比对照提高25.21%,供水方式对WUE有很大影响;③Pmax,AQY,Rd比对照有所升高,均显著高于T1处理,且在一定程度上增大了牛扁对光能的利用范围。结论:固定单侧水分胁迫虽然用水量比对照减少1/2,但其叶片活性和光合能力下降;分区交替水分胁迫不但用水量减半,而且其水分利用效率和光合作用潜力也优于对照,逐渐提高了牛扁的抗胁迫能力,挖掘了其自身的生物学节水潜力,对干旱地区牛扁栽培意义重大。
Objective: To study the effects of different water stress modes on the response characteristics of photosynthesis light of Bovine Opium japonicum, providing basis for the exploitation and utilization of Niu Bian in arid areas. Methods: Three water supply - stress cycles of cattle flat transplanted seedlings were treated with fixed unilateral water stress (T1), subarea alternating water stress (T2) and control both sides of water supply (T3), and the correlations were determined at the end of each cycle index. Results: Under alternate water stress: ①Pn was higher than the control 6.53% at the end of the experiment, which was significantly higher than that of the T1 treatment. The main factors affecting the photosynthetic rate were non-stomatal factors. ②Tr and Gs were 15.61%, 10.96% Control increased 25.21%, WUE has a great impact on water supply; ③ Pmax, AQY, Rd increased compared with the control, were significantly higher than the T1 treatment, and to some extent, Niu Bian to increase the range of light energy use. Conclusion: The water stress of fixed unilateral water stress decreased by 1/2 compared with the control, but its leaf activity and photosynthetic capacity decreased. The alternating water stress of sub-region not only reduced water consumption by half, but also its water use efficiency and photosynthesis potential were better than those of the control. Gradually increased the anti-stress ability of Niu Bian and tapped its own biological water-saving potential, which is of great significance to the cultivation of Niu Bian in arid areas.