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

Effect of Manganese Supply on the Physiological Availability of Iron in Rice Plants Grown in Sand Culture

“…Peroxidase activity at a level of 100 pM manganese increased in all the treatments and the activity of succinic dehydrogenase and aconitase showed a marked increase in the nitrate-ferric citrate treatment. These results would indicate that manganese excess also increases the physiological availability of iron instead of depressing it and would support the hypothesis of MORRIS and PIERRE (18), BERGER and GERLOFF (4), and AGARWALA et al (1) that manganese excess and iron deficiency bring about different reactions. HEWITT (10) stated that the symptoms of manganese toxicity were often entirely distinct from those of iron deficiency and 'did not occur under the same conditions.…”

“…It appears that the content of leaf tissue iron was not related to iron deficiency, as has also been observed by MARSH et al (16) and AGARWALA et al (1).…”

“…These effects could be attributed to induced iron deficiency, as has been pointed out earlier by AGARWALA et al (1). When the concentration of manganese was lowered from 10 to 0.02 pM irrespective of iron and nitrogen sources, there was a decrease in the content of tissue manganese under low manganese supply, and consequently rice plants developed manganese deficiency symptoms and the activity of malic dehydrogenase decreased.…”

Peroxidase Isozymes in Mature Barley Kernels

“…Also, crystalline preparations of two distinct wheat (Titicum sestivum L.) peroxidase enzymes were found to effectively degrade IAA (Shin and Nakamura 1962). The peroxidase enzymes of barley have been studied, particularly in relation to frost resistance (Brad and Laszlo 1960;Brad 1966;Ostaplyuk 1968), mineral nutrition (Vard'ya 1963;Agarwala et al 1961Agarwala et al ,1964, and response to gibberellic acid treatment (Duffus 1966;Pollard 1969;Harmey and Murray 1968;Murray and Harmey 1970 (1966) and by Fedak and the gel was photopolymerized. This procedure Rajhathy (1972a) produced 12 sample wells with a heisht of 1'3 in the present study, polyacrylamide slab cm' and the bottoms of the wells were separated electrophoresis was used to separate per-from the separating gel by a depth of 5 mm of oxidase isozymes rrom mature bartey ker-lSiti;ii.i,l,tfli,t"JlTt"'.','#1.?…”

Iron Accumulation, Root Peroxidase Activity, and Varietal Interactions in Soybean Genotypes That Differ in Iron Nutrition

“…18, 19) and the activity of iron porphyrin enzyme systems from several plant species grown under iron deficiency conditions ( 1,2,3,6,11,14,15) have been studied. Catalase activity does not appear to be related to iron supply, while peroxidase activity was reportedly stimulatedl.…”