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THE RELATIONSHIP BETWEEN NICKEL‐TOXICITY SYMPTOMS AND THE ABSORPTION OF IRON AND NICKEL
Author(s) -
CROOKE W. M.,
KNIGHT A. H.
Publication year - 1955
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1955.tb02494.x
Subject(s) - chlorosis , nickel , toxicity , biology , iron deficiency , horticulture , ferric , germination , botany , chemistry , medicine , anemia , organic chemistry
During a 70‐day experimental period from germination to maturity, the iron content of oat plants that showed symptoms of nickel toxicity changed little, but the nickel content increased rapidly for about 30 days and then decreased slowly. Necrosis varied little with time, while chlorosis increased in severity for 40 days, then decreased until unfolding young leaves were no longer chlorotic. This change in chlorotic symptoms was correlated with the nickel‐iron ratio in the plant. Autoradiographs of leaves from plants supplied with radioactive iron showed that necrotic areas in the leaf matched areas in the autoradiograph having a very low content. Chlorotic areas were found to correspond with areas whose iron content was lower than that of healthy tissue. More iron was found in the veins than in the interveinal tissue, and its distribution was the same whether supplied as ferric citrate or in a chelated form. The concentration of iron in mature leaves from oat plants growing in a nickel toxic soil was lowest in the necrotic areas of the leaf, suggesting a migration of nutrients out of this dying tissue.