---

作 者 ：孙山^1,2;张立涛²;王家喜¹;王少敏¹;高华君¹;高辉远^2,3

期 刊 ：应用生态学报 2008年 19卷 03期 页码：512-516

关键词：杏；

摘 要 ：以温室栽培的金太阳杏为材料,测定了金太阳杏叶片光合速率(P_n)、光系统Ⅱ(PSⅡ)光下实际光化学效率(Φ_PSⅡ)、光化学猝灭系数(q_P)和开放的PSⅡ反应中心的激发能捕获效率(F_v^′/F_m^′), 探讨了低温弱光(7 ℃、200 μmol·m^-2·s^-1 PFD)对叶片光系统Ⅰ(PSⅠ)和PSⅡ的抑制作用.结果表明：温室栽培的金太阳杏叶光合作用的最适温度在25 ℃左右.光下7 ℃的低温可使叶片净光合速率(P_n)大幅下降,造成激发压(1-q_P)增大,进而引起光抑制.低温弱光条件使PSⅠ和PSⅡ功能受到破坏，与单纯低温胁迫(7 ℃,黑暗)处理相比,经低温、弱光(7 ℃, 200 μmol·m^-2·s^-1PFD)胁迫2 h后,PSⅠ活性下降了28.26%,而PSⅡ最大光化学效率（F_v/F_m）没有发生显著变化,表明低温弱光条件下PSⅠ比PSⅡ 更易发生光抑制.

Abstract:In this paper, the net photosynthetic rate (P_n), actual photochemical efficiency of PSⅡ(Φ_PSⅡ), photochemical quenching(q_P), and maximal photochemical efficiency of PSⅡ in light (F_v^′/F_m^′) of apricot (Prunus armeniaca) leaves in solar greenhouse were measured, and the effects of low temperature (7 ℃) and weak light (200 μmol·m^-2·s^-1 PFD) on the photoinhibition of PSⅠ and PSⅡ were investigated. The results showed that the optimal temperature for the photosynthesis of apricot leaves was around 25 ℃, and the photosynthetic capacity was reduced greatly by the low temperature and weak light, inducing a markedly increased excitation press (1-q_P) and in turn, resulting in photoinhibition. The functions of both PSⅠ and PSⅡ were damaged by the low temperature and weak light. Comparing with those only subjected to low temperature, the leaves subjected to both low temperature and weak light had a decreased activity of PSⅠ, with a decrement of 2826% within 2 h, but their maximal photochemical effeciency of PSⅡ (F_v/F_m) had little change in the same period, suggesting that under low temperature and weak light, PSⅠ was more suffered from photoinhibition than PSⅡ.

---