论文部分内容阅读
以 12 年生‘黑叶’荔枝(Litchi chinensis Sonn.‘Heiye’)为研究材料,进行遮荫、环剥及遮荫 + 环剥处理,观测这些处理对新梢生长,以及叶片净光合速率、叶片光系统Ⅱ(PSⅡ)最大光量子效率(Fv/Fm)和淀粉含量的影响。结果表明:遮荫处理和环剥处理均能显著抑制枝梢生长,降低叶片的净光合速率,但两种处理抑制光合作用的机制各异。其中,环剥处理导致叶绿素含量降低,产生永久性光抑制,显示光系统Ⅱ(PSⅡ)受到破坏,因此,环剥处理导致光合作用的降低与光反应系统的破坏有关;遮荫下叶片最大光化学效率 Fv/Fm维持正常,淀粉含量降低,但即使在相同的人工光源下,光合作用速率同样低于对照,可能主要与暗反应系统活性减弱有关;而遮荫可显著缓解环剥对光反应系统的破坏效应。
The 12-year-old ’Litchi chinensis Sonn’Heiye’ was used to study the effects of shading, girdling, shading and girdling on the growth of shoots, the net photosynthetic rate of leaves, Effect of maximum photon quantum efficiency (Fv / Fm) and starch content of PSⅡ. The results showed that both shading treatment and ring peeling treatment could significantly inhibit the shoot growth and decrease the net photosynthetic rate of leaves, but the photosynthesis mechanisms of the two treatments were different. Among them, the ring-peeling treatment led to the reduction of chlorophyll content, resulting in a permanent photoinhibition, indicating that photosystem Ⅱ (PSⅡ) is damaged. Therefore, the reduction of photosynthesis caused by ring-peeling treatment is related to the destruction of photoreaction system; The efficiency of Fv / Fm remained normal and the content of starch decreased. However, under the same artificial light source, the photosynthetic rate was also lower than that of the control, which may be mainly related to the diminished activity of the dark reaction system; The damaging effect.