Uptake and distribution of root-applied or foliar-applied Zn-65 after flowering in aerobic rice

文献类型： 外文期刊

第一作者： Jiang, W.

作者： Jiang, W.;Struik, P. C.;Lingna, J.;van Keulen, H.;Ming, Z.;Stomph, T. J.

作者机构：

关键词： grain quality;nutrient distribution;nutrient uptake;Oryza sativa zinc

期刊名称：ANNALS OF APPLIED BIOLOGY （ 影响因子：2.75； 五年影响因子：2.942 ）

ISSN： 0003-4746

年卷期： 2007 年 150 卷 3 期

页码：

收录情况： SCI

摘要： We investigated the uptake and distribution of zinc (Zn) either applied to the roots or to the leaves in rice during grain development. Plants of two aerobic rice cultivars were grown in a nutrient solution with either sufficient Zn or surplus Zn. Root treatment with 1 week's supply of both Zn-65 and unlabelled Zn was started at flowering or 15 days after flowering (DAF). Foliar treatment with Zn-65 applied to the flag leaf or to senescent leaves was carried out at flowering. When Zn-65 was applied to roots, plants continued to take up Zn after flowering, even beyond 15 DAF, irrespective of cultivar and Zn nutritional status of the plants. During the 1 week of supply of both Zn-65 and unlabelled Zn, which either started at flowering or 15 DAF, the absorbed Zn-65 was mainly distributed to roots, stem and grains. Little Zn-65 was allocated to the leaves. Following a week of Zn-65 supply directly after flowering, under sufficient Zn or surplus Zn, the proportions of total Zn-65 uptake allocated to the grains continued to change during grain filling (9-33%). This Zn mainly came from the roots but under sufficient Zn supply also from the stem. With Zn-65 applied to leaves (either the flag leaf or the lowest senescent leaf), both cultivars showed similar Zn distribution within the plants. About 45-50% of the Zn-65 absorbed was transported out of the Zn-65-treated leaf. From that Zn, more than 90% was translocated to other vegetative organs; little was partitioned to the panicle parts and even less to the grains. These results suggest that in rice plants grown under sufficient or surplus Zn supply, most of the Zn accumulated in the grains originates from uptake by roots after flowering and not from Zn remobilisation from leaves.

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