希尔反应由英国科学家罗伯特·希尔发现，故称“希尔反应”。 希尔反应是指叶绿体借助光能使电子受体还原并放出氧的反应。当希尔（R．Hill，1937）用光照射加有草酸铁的叶绿素悬浊液时，发现Fe3+还原成Fe2+并放O2（1937）。 即在光照下，离体叶绿体类囊体能将含有高铁的化合物（如高铁氰化物）还原为低铁化合物，并释放氧，将这个反应称为希尔反应(Hill reaction)。氢的受体也称为希尔氧化剂，例如NADP+、NAD+、苯醌等。
近年来发现许多化合物都有希尔反应抑制活性。
Recently, many compounds have been found to have activities of Hill Reaction.
从试验结果还可看出，非环式光合磷酸化与希尔反应活性及ATP酶活性呈明显的正相关。
The activities of non-cyclic PSP showed significant positive correlation with the activities of Hill reaction and ATPase.
随低温处理时间的延长，玉米离体叶片光合速率迅速下降，叶绿体希尔反应活性下降，叶片电解质外渗率增加。
The photosynthetic rate of detached leaves and Hill reaction of chloroplast were inhibited graviously during chilling treatment, and the electrolyte leakage of leaves was increased by chilling.
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