ISHS Acta Horticulturae 403: International Symposium on Cultivar Improvement of Horticultural Crops. Part 2: Fruit Crops
PHYSIOLOGICAL REACTION OF CITRUS TUBE-CULTURED SEEDLINGS OF DIFFERENT GENOTYPES TO FE2+ AND HCO3- |
| Authors: | Z. Shijiang, Z. Xuewu, L. Daogao |
| Keywords: | Citrus, iron chlorosis, physiology |
| Abstract:
Three types of tube-cultured citrus seedlings representing three classes of susceptibility to iron chlorosis were used in the study to investigate the physiological response of different genotypes to Fe2+ (0 or 100 μmoIL-1) and HCO3-(0 or 10 mmoIL-1), through the estimation of catalase activity, peroxidase activity, chlorophyll contents and root activity, which are likely to be related to iron nutrition status in plants. The result showed that HCO3- caused serious physiological disorders, while Fe2+ had little effect. However, the extent to which the tube-cultured citrus seedlings were affected by HCO3- varied with genotypes, with C. aurantium being the slightest, C. reticulata the moderate and P. trifoliata the most serious, which exhibited good rank correlation with the relative susceptibility of the three species to lime-induced chlorosis shown in orchards. | |
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