农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2010年
1期
15-18
,共4页
铈%UV-B辐射%大豆幼苗%光合作用%原初反应
鈰%UV-B輻射%大豆幼苗%光閤作用%原初反應
시%UV-B복사%대두유묘%광합작용%원초반응
Ce(Ⅲ)%UV-B radiation%soybean seedling%photosynthesis%primary reaction
用水培法研究了Ce(Ⅲ)对紫外辐射(UV-B,280~320 nm)胁迫下大豆幼苗光合原初反应的影响.结果表明,20 mg·L~(-1)CeCl_3 能有效减缓紫外辐射(T1/3.34 kJ·m~(-2)和T2/11.76 kJ·m~(-2))胁迫所导致的叶绿素与类胡萝卜素含量减少、光能转换效率(Fv/Fm)及传递能力(Fv/F_0)降低,且对低剂量胁迫的调控效果优于高剂量,即以上指标Ce+T1>T1,Ce+T2>T2,Ce+T1>Ce+T2.从光合原初反应的能量分配看,Ce(Ⅲ)能促使大豆叶片吸收光能的总量增加,加快内囊体膜上光电的转换和电子的传递,降低UV-B辐射伤害而导致的过剩激发能积累,从而消除过剩激发能诱发的膜脂过氧化对光合器官的潜在威胁.
用水培法研究瞭Ce(Ⅲ)對紫外輻射(UV-B,280~320 nm)脅迫下大豆幼苗光閤原初反應的影響.結果錶明,20 mg·L~(-1)CeCl_3 能有效減緩紫外輻射(T1/3.34 kJ·m~(-2)和T2/11.76 kJ·m~(-2))脅迫所導緻的葉綠素與類鬍蘿蔔素含量減少、光能轉換效率(Fv/Fm)及傳遞能力(Fv/F_0)降低,且對低劑量脅迫的調控效果優于高劑量,即以上指標Ce+T1>T1,Ce+T2>T2,Ce+T1>Ce+T2.從光閤原初反應的能量分配看,Ce(Ⅲ)能促使大豆葉片吸收光能的總量增加,加快內囊體膜上光電的轉換和電子的傳遞,降低UV-B輻射傷害而導緻的過剩激髮能積纍,從而消除過剩激髮能誘髮的膜脂過氧化對光閤器官的潛在威脅.
용수배법연구료Ce(Ⅲ)대자외복사(UV-B,280~320 nm)협박하대두유묘광합원초반응적영향.결과표명,20 mg·L~(-1)CeCl_3 능유효감완자외복사(T1/3.34 kJ·m~(-2)화T2/11.76 kJ·m~(-2))협박소도치적협록소여류호라복소함량감소、광능전환효솔(Fv/Fm)급전체능력(Fv/F_0)강저,차대저제량협박적조공효과우우고제량,즉이상지표Ce+T1>T1,Ce+T2>T2,Ce+T1>Ce+T2.종광합원초반응적능량분배간,Ce(Ⅲ)능촉사대두협편흡수광능적총량증가,가쾌내낭체막상광전적전환화전자적전체,강저UV-B복사상해이도치적과잉격발능적루,종이소제과잉격발능유발적막지과양화대광합기관적잠재위협.
Effect of cerium(Ⅲ) on photosynthetic primary reaction in soybean seedlings under ultraviolet-B radiation (UV-B, 280-320 nm) stress was studied with hydroponics under laboratory conditions. UV-B radiation (T1/3.34 kJ·m~(-2), T2/11.76 kJ·m~(-2)) caused the decrease in chlorophyll(Chl) and carotenoid(Car) content, optimal photochemical efficiency of PSⅡ (Fv/Fm) and light transport capacity (Fv/F_0), and the excess accumulation of excitation energy. The decrease degree of each index was positively related with UV-B radiation dosage. However, CeCl_3(20 mg · L~(-1)) increased Chl and Car content, Fv/Fm and Fv/F_0, compared with those of the controls. For Ce+ UV-B treatments, all of indices were still lower than those of the controls, but obviously higher than those of UV-B treatments. The sequence was followed as: Ce+T1> T1; Ce+T2>T2; Ce+T1 >Ce+T2. The result indicated that Ce(20 mg·L~(-1)) could alleviate UV-B-induced inhibition on photosynthetic primary reaction, and that regulating effect of Ce on all indices mentioned above under low dosage of UV-B radiation was better than that under high dosage. As to the excitation energy distribution in photosynthetic light reactions in UV-B, Ce and Ce+UV-B treatments, Ce(Ⅲ) could promote leaves absorbing more light energy by increasing Chl content, accelerate photoelectric conversion and electron transport in thylakoid membrane, and decrease the excess accumulation of excitation energy induced by UV-B radiation, which could alleviate the potential damage on chloroplast structure due to aggravation of membrane lipid peroxidation.