【摘要】 缺铁大豆、玉米光饱合光合速率比对照大豆、玉米分别下降了大约 88%和 95 %左右。随光强增加 ,缺铁大豆、玉米叶片的Fv’ Fm’、qP显著降低 ;缺铁玉米叶片的Fv’ Fm’、qP降低比缺铁大豆显著。缺铁大豆、玉米的NPQ随光强增加而增加并且比对照高。缺铁叶片叶黄素脱环化程度比对照高大约 3～ 4倍 ,缺铁玉米叶片脱环化程度比缺铁大豆略高。所以我们认为缺铁叶片减少了用于光化学反应的激发能 ,大部分激发能被耗散掉了 ;缺铁叶片增强了依赖叶黄素循环的热耗散 ;而且缺铁玉米比缺铁大豆启动了更多的叶黄素循环更多还原

【Abstract】 Compared with control soybean and maize leaves, the maximum photosynthesis rate with light saturating in iron-deficient soybean and maize leaves decreased about 88% and 95%, respectively. Markedly decreased Fv’/Fm’ and qP in iron-starved soybean and maize leaves were observed with PFD increasing; Fv’/Fm’ and qP in iron-starved maize leaves decreased more seriously than that in iron-starved soybean leaves. NPQ in iron-starved soybean and maize leaves increased with PFD increasing and were higher than that in control leaves. The de-epoxidation content of xanthophyll cycle in iron-starved soybean and maize leaves was about 3～4 time higher than that in control leaves, and it was noticed that the de-epoxidation content of xanthophyll cycle in iron-starved maize leaves was slight higher than that in iron-starved soybean leaves. Thus, it was considered that excited energy used in photochemical reaction was depressed, and more excited energy was dissipated. Thermal dissipation depending xanthophyll cycle was enhanced, and more thermal dissipation depending xanthophyll cycle was triggered in iron-starved maize leaves than that in iron-starved soybean leaves.更多还原