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以骆驼蓬幼苗为材料,采用盆栽试验研究不同浓度(0、50、100、200、400 mg.kg-1)Ni、Cu处理对骆驼蓬叶片光合作用、叶绿素荧光特性及生长状况的影响.结果表明:随着Ni浓度的增加,骆驼蓬幼苗叶片的光合色素含量、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、PSⅡ最大光化学效率(Fv/Fm)、PSⅡ电子传递量子产率(ΦPSⅡ)、光化学猝灭系数(qP)及各项生长指标均呈显著下降趋势,而细胞间隙CO2浓度(Ci)和非光化学猝灭系数(qN)呈显著增加趋势,其中Pn的下降主要是由非气孔限制所致;骆驼蓬幼苗叶片的光合色素含量、Pn、Gs、Tr、Ci、Fv/Fm、ΦPSⅡ、qP及各项生长指标均在50 mg.kg-1 Cu处理时达到峰值,叶绿素a和b、Pn、Gs、Tr、Ci、Fv/Fm及各项生长指标值在100 mg.kg-1 Cu处理时仍微高于对照,而后随Cu浓度的增加,光合色素含量、Pn、Gs、Tr、Ci、Fv/Fm、ΦPSⅡ、qP及各项生长指标均呈下降趋势,qN呈增加趋势,其中Pn的下降主要是由气孔限制所致.
Pot experiment was conducted to study the effects of different concentrations (0, 50, 100, 200 and 400 mg.kg-1) of Ni and Cu treatments on the photosynthesis, chlorophyll fluorescence characteristics and growth status of Peganum harmala seedlings under pot experiment. The results showed that photosynthetic pigment content, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), PSⅡ maximum photochemical efficiency (Fv / Fm), PSⅡ electron The quantum yield (ΦPSⅡ), photochemical quenching coefficient (qP) and growth index all showed a significant decreasing trend while the intercellular CO2 concentration and non-photochemical quenching coefficient (qN) increased significantly, of which Pn The photosynthetic pigment content, Pn, Gs, Tr, Ci, Fv / Fm, ΦPSⅡ, qP and the growth indexes of P. hannai seedlings were all treated by 50 mg.kg-1 Cu (P <0.05). The chlorophyll a, b, Pn, Gs, Tr, Ci, Fv / Fm and their growth index were all slightly higher than those of the control under 100 mg.kg-1 Cu treatment. Pigment content, Pn, Gs, Tr, Ci, Fv / Fm, ΦPSⅡ, qP and all growth indicators showed a downward trend, qN Showing an increasing trend, in which the decline of Pn was mainly caused by stomatal limitation.