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为探索酸雨与稀土镧对大豆幼苗生长的复合影响及其内在机制,以重要油粮作物大豆(Glycine max)为材料,研究在模拟酸雨pH分别为3.0、3.5、4.5与稀土镧La(Ⅲ)浓度分别为60、100和300mg·L-1处理下大豆幼苗生长及光合作用的变化.结果表明,相对单一酸雨与镧处理,酸雨与La(Ⅲ)复合处理组中大豆幼苗的生长受抑制程度增大,两者呈协同效应,且pH越低,La(Ⅲ)浓度越高,抑制效应越明显.光合参数的变化规律与生长指标近同,相同处理组各光合参数的降幅不一致,其中最大荧光(Fv/Fm)和叶绿素含量(Chl)的降幅范围分别为9.53%～22.75%和9.14%～24.53%,较净光合速率Pn(22.78%～84.7%)、希尔(Hill)反应速率(15.52%～73.38%)和Mg2+-ATPase活性(14.51%～71.54%)小,表明各光合参数对2个胁迫因子的敏感程度存在差异.进一步相关性分析发现,Pn变化主要受Hill反应速率与Mg2+-ATPase活性的影响,而Chl、Fv/Fm次之.表明酸雨与La(Ⅲ)对植物光合过程各环节的作用机制不同,光合作用受阻是影响植物生长的重要因素之一.
In order to explore the compound effects of acid rain and rare earth lanthanum on the growth of soybean seedlings and its intrinsic mechanism, Glycine max, an important oil crop, was used to study the effects of acid rain pH 3.0, 3.5, The results showed that compared with single acid rain and lanthanum treatment, the growth inhibition of soybean seedlings under acid rain and La (Ⅲ) treatment was inhibited (P <0.05), the synergistic effect was found between the two treatments, and the lower the pH, the higher the concentration of La (Ⅲ) was, the more obvious the inhibition effect was.The variation of photosynthetic parameters was similar to the growth index, and the decline of photosynthetic parameters of the same treatment group was inconsistent, The decreasing range of Fv / Fm and Chl was 9.53% -22.75% and 9.14% -24.53%, respectively, which were higher than Pn (22.78% -84.7%), Hill reaction rate 15.52% -73.38%) and Mg2 + -ATPase activity (14.51% -71.54%), indicating that there is a difference in the sensitivity of the photosynthetic parameters to the two stress factors.Further correlation analysis showed that the Pn changes were mainly affected by Hill reaction rate and Mg2 + -ATPase activity, whereas Chl, Fv / Fm followed And La (Ⅲ) on various aspects of the role of different mechanisms of plant photosynthesis process, blocked photosynthesis is one of the important factors affecting plant growth.