摘要
缺铁叶片的光合速率大幅度下降。这种降低可能不是色素含量降低的结果 ;而且缺铁对PSII复合物的活性影响很小 ;较高的PQ还原程度显示缺铁叶片PSII受体侧电子传递受阻 ,这可能是导致光合速率下降的主要因素。强光下缺铁叶片的天线转化效率比正常叶片低 ,用于光化学反应的激发能很少。缺铁导致大豆叶片激发能耗散增加。通过抑制剂处理和叶黄素组分的分析 ,可以认为在耗散过剩激发能的过程中 。
Photosynthetic rate was much lowered in soybean leaves suffering from iron deficiency than in the control (Figs.1,2). The decrease in photosynthesis might not be due to the severely lowered pigment content. Iron deficiency had only slight impact on the activity of PSII (Fig.3). The larger extent of PQ reduction in Fe deficient soybean leaves showed that electron transport at the acceptor side of PSII was blocked apparently (Fig.4), indicating that the blocked electron transport may be the main factor of photosynthesis reduction. It was observed that antenna efficiency at open PSII reaction centers (Fv′/Fm′) decreased in iron deficient soybean leaves, and excited energy used in photochemical reaction was also suppressed (Fig.5). Excitation energy dissipation was higher in iron deficient soybean leaves (Fig.6). It is proposed that xanthophyll cycle may be fully triggered in iron deficient soybean leaves through inhibitor treatment and analysis of xanthophyll cycle pigments (Figs.6, 7).
出处
《植物生理与分子生物学学报》
CAS
CSCD
2002年第2期127-132,共6页
Journal Of Plant Physiology and Molecular Biology
基金
国家重点基础研究发展规划项目 (G19980 10 10 0 )资助
关键词
缺铁
大豆叶片
激发能
耗散增加
光合速率
叶黄素循环
叶绿素荧光
iron deficiency, photosynthesis, xanthophyll cycle, chlorophyll fluorescence, non photochemical quenching
