The Effect of Different Iron and Manganese Nutrient Levels on the Catalase and Cytochrome Oxidase Activities of Green and Albino Sunflower Leaf Tissues.

Interrelationship of Iron and Manganese Supply in Growth, Chlorophyll, and Iron Porphyrin Enzymes in Barley Plants

“…In respect to the depression in both catalase and peroxidase at the deficient levels of iron supply, 0.056 to 0.56 ppm at the normal manganese supply, our results are in accord with DeKock et al (13) (42), Ban-erjee (7), and Agarwala and Sharma (2). The depression in chlorophyll at low iron levels has also been reported by Sideris and Young (36), Weinstein and Robbins (42), DeKock et al (13), and Agarwala and Sharma (2).…”

“…These workers also held that iron deficiency is identical with manganese excess and iron excess with manganese deficiency, the 2 elements having a mutually antagonistic effect. Twyman (40) and Weinstein and Robbins (42) observed a close similarity between the effect of iron deficiency and manganese excess but the experimental evidence obtained by Berger and Gerloff (8), Hewitt (15,16), and Morris and Pierre (24) indicated that in many plants the effects of the 2 were quite distinct.…”

“…But at 0.056 to 0.56 ppnm iron supply low manganese depressed peroxidase and at 0.056 to 1.4 ppm iron supply excess manganese increased peroxi(lase, the increase being very marked and statistically significant (fig 13). In leaves other than the first, at the normal manganese supply, peroxidase was dlepressed within the range 0.056 to 0.56 ppm iron supply and, but for one exception, not affected within the range 1.4 to 28 ppm iron supply (fig 14, 15, 16 (8) Lespedeza (24) and certain other plants (41) but not in soybeans (37) oats and tomlato (40) and sunflower (42) The yield of plants showed a significant interaction of iron and manganese supply. In contrast to the findings of Pugliese (34) for wheat, Scharrer and Schropp (35) for maize, and Somers and Shive (37) for soybeans, yield of barley plants was found to be determined more by the absolute levels of iron or manganese supply than by their relative proportions.…”

Investigations of the Role of Iron in Chlorophyll Metabolism I. Effect of Iron Deficiency on Chlorophyll and Heme Content and on the Activities of Certain Enzymes in Leaves

“…Jljin (17,18,19) demonstrated that iron deficiency in plants resulted in decreased dry weight, salt, and protein nitrogen contents and increased contents of amino and organic acids. Extensive studies (8,9,25,33) have confirmled Ilj in's observations, but despite the keen interest in iron chlorosis. no clear evi(lence of the precise role of iron in chlorophyll me-tabolism has been obtained.…”

Chlorosis of the rice plant induced by high pH of culture solution

“…Plants suffering from chlorosis, induced either by iron deficiency or by manganese excess, are reported to contain large amounts of organic acids (18). Chlorotic plants contain more citrate, malate, and soluble nitrogen compounds (19).…”