Abstract
The relationship among iron toxicity, bronzing symptom, and stress-induced ethylene production (SEP) was investigated in detached rice (Oryza sativa L.) leaves during the vegetative-ripening stage and in whole plants during the vegetative stage. When Fe2+ (200 mg L-1) was applied to the detached leaf through a transpiration stream, SEP was higher in the first leaf than in the second and third leaves from the top and maximal around the panicle primordia initiation stage. The genotype difference in SEP was more pronounced in the second and third leaves than in the first leaf. Bronzing intensity increased as SEP increased; iron concentration increase during treatment in the tissue did not correlate with bronzing intensity or with SEP among the 16 genotypes tested. When the roots of an intact plant were exposed to 300 mg L-1 of Fe2+ in culture solution little stress-induced ethylene was produced. By partially or totally derooting the plant, however, stress-induced ethylene was evoked, indicating that roots reduced the Fe2+ uptake so that little stress ethylene is produced in the intact plant. Leaf tissue tolerance for Fe2+ may contribute to genotype differences in iron toxicity tolerance of rice plants when roots are injured during transplanting or exposed to toxic substances in the soil.
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Yamauchi, M., Peng, X.X. Iron toxicity and stress-induced ethylene production in rice leaves. Plant Soil 173, 21–28 (1995). https://doi.org/10.1007/BF00155514
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DOI: https://doi.org/10.1007/BF00155514