Taylor D M, Morgan P W, Joham H E, Amin J V
Department of Plant Sciences, Texas A & M University, College Station, Texas 77843.
Plant Physiol. 1968 Feb;43(2):243-7. doi: 10.1104/pp.43.2.243.
Tissue manganese was found to influence the indoleacetic acid (IAA) system of cotton over a wide range of concentrations. The cofactor and inhibitor activities of the IAA-oxidase system were affected as the concentration of manganese in the tissue was varied. Maximum inhibitor activity was found in leaf extracts from the plants grown in 0.5 mg/l manganese (Hoagland's level). The inhibitor activity decreased in the leaf extracts of plants grown at concentrations of manganese either higher or lower than 0.5 mg/l. Abnormally high IAA-oxidase activity was found in the leaves of plants grown in deficient levels of manganese (<0.0005, 0.005 mg/l) and the extracts from plants in the <0.0005 mg/l Mn treatment showed IAA-oxidase cofactor activity.
研究发现，组织中的锰在很宽的浓度范围内会影响棉花的吲哚乙酸（IAA）系统。随着组织中锰浓度的变化，IAA氧化酶系统的辅因子和抑制活性会受到影响。在以0.5毫克/升锰（霍格兰水平）生长的植物的叶片提取物中发现了最大抑制活性。在锰浓度高于或低于0.5毫克/升的植物叶片提取物中，抑制活性降低。在锰缺乏水平（<0.0005、0.005毫克/升）下生长的植物叶片中发现了异常高的IAA氧化酶活性，并且在<0.0005毫克/升锰处理的植物提取物中显示出IAA氧化酶辅因子活性。
