Plant Nutrition pp 226-227 | Cite as
Retranslocation of Zn from leaves as important factor for zinc efficiency of rice genotypes
Abstract
Zinc (Zn) retranslocation from mature to growing leaves and its dependence on Zn nutritional status were studied in a Znefficient and a Zn-inefficient rice genotype. Plants were precultured in nutrient solution with low Zn supply and afterwards loaded either with unlabelled Zn 65Zn or for 48 h. Zn-loaded plants were grown for further 16 to 20 d in a chelator-buffered (HEDTA) nutrient solution at low (2 pM) and adequate (130 pM) levels of free Zn2+ activity. Zn retranslocation took already place from individual, not yet fully expanded leaves into youngest leaves after emergence. This Zn retranslocation from source to sink leaves was higher under low Zn supply and higher in the Zn-efficient (up to 61%) than in the Zninefficient genotype (up to 47%). In addition, the transition from a sink to a source leaf for Zn retranslocation took place 2–3 d earlier under low than adequate Zn supply. This data indicates that besides Zn acquisition by roots mobility and retranslocation of Zn within rice plants have to be considered as important factor in genotypical differences for Zn efficiency.
Key words
Oryza sativa rice genotypes utilisation efficiency zinc efficiency zinc retranslocationReferences
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