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在苗期用黑色遮阳网对丰花1号和丰花2号进行不同遮光处理(不遮光,遮光27%、43%和77%),研究了苗期遮光及恢复对花生叶片光合特性的影响.结果表明:遮光后,随遮光程度增强,叶片叶绿素含量显著增加,实际光化学效率(ФPSⅡ)和最大光化学效率(Fv/Fm)升高,叶绿素a/b和净光合速率(Pn)降低.恢复自然光照后1d,在高光强下测定时,随前期遮光程度增强,Pn、气孔导度(Gs)下降,细胞间隙CO2浓度(Ci)升高;在低光强下测定时,Pn显著升高,Gs和Ci下降;低光强与高光强下测定的Pn比值显著升高;恢复自然光照后,随前期遮光程度增强,光补偿点、光饱和点、CO2补偿点、CO2饱和点和羧化效率显著降低,表观量子效率显著升高.恢复自然光照后,Pn、ФPSⅡ和Fv/Fm先迅速下降,3～5d后逐渐回升;恢复15d后,遮光27%处理的各项指标恢复到对照水平,其他处理的恢复程度则因遮光程度和品种而异.丰花1号各处理叶绿素含量、Pn、ФPSⅡ均高于丰花2号.苗期遮光提高了花生利用弱光的能力,降低了其利用强光的能力.
The effect of shading and recovery on photosynthetic characteristics of peanut leaves at seedling stage was studied under different shades of shading (No shading, shading 27%, 43% and 77% The results showed that the leaf chlorophyll content increased significantly with shading increasing, and the actual photochemical efficiency (ФPSⅡ) and maximum photochemical efficiency (Fv / Fm) increased while the chlorophyll a / b and Pn decreased. After 1 day of natural illumination, the Pn and Gs decreased with the increase of shading, while the increase of intercellular CO2 concentration (Ci) when measured at high light intensity. Pn increased significantly at low light intensity, Gs and Ci decreased; the Pn ratio measured at low light intensity and high light intensity increased significantly; After natural light was restored, the light shading intensity increased with the increase of light compensation point, light saturation point, CO2 compensation point, CO2 saturation point and carboxylation efficiency Decreased and apparent quantum yield increased significantly.Pn, ФPSⅡ and Fv / Fm firstly decreased rapidly after natural light was restored and gradually rose after 3 ~ 5d, and after 15d recovery, the indexes of shading 27% returned to the control level, The rest of the treatment due to the degree of shade and variety vary Chlorophyll content, Pn, ФPSⅡ were higher than Fenghua 2. Seedling Shading improve the ability to use peanut low light, reducing its ability to take advantage of strong light.