IS THE RELEASE OF PHYTOSIDEROPHORES IN ZINC-DEFICIENT WHEAT PLANTS A RESPONSE TO IMPAIRED IRON UTILIZATION
IS THE RELEASE OF PHYTOSIDEROPHORES IN ZINC-DEFICIENT WHEAT PLANTS A RESPONSE TO IMPAIRED IRON UTILIZATION
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DOI：
10.1111/j.1399-3054.1994.tb08841.x
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发表时间：
1994-11-01
影响因子：
6.4
通讯作者：
MORI, S
中科院分区：
文献类型：
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作者：
WALTER, A;ROMHELD, V;MORI, S
在营养液培养条件下，研究了锌营养状况对两个小麦品种（Triticum aestivum，cv. Aroona; T.杜伦湾Durati）对锌缺乏的敏感性不同。在锌高效品种Aroona，锌缺乏下铁从根到地上部的转运显着减少，在13和15天的老厂，而植物铁载体的释放增强时，植物16天。随着缺锌在老植株中变得更加严重，铁向地上部的转运进一步减少，植物铁载体的释放进一步增强。在营养液中补锌可显著增加缺锌植株48和72 h后铁向地上部的转运。同时，植物铁载体的释放受到抑制。另一个品种Durati，归类为锌效率低下的实地观察，不同的品种。Aroona，表现出较低的植物铁载体释放率下缺锌，和较少受损的铁转运到地上部。叶面施用柠檬酸铁锌缺乏Aroona植物抑制植物铁载体的释放，并增加铁的浓度在地上部和根部。Fe-55的应用表明，铁从地上部到根部的再转运不受锌营养状况的影响。它的结论是，增强释放植物铁载体在缺锌小麦植株诱导主要是由受损的铁转运到地上部。
The effect of zinc nutritional status on the time course of phytosiderophore release, and uptake of iron and translocation of iron to the shoot, was studied in nutrient solution cultures for two cultivars of wheat (Triticum aestivum, cv. Aroona; T. durum, cv. Durati) differing in their susceptibility to zinc deficiency. In the zinc-efficient cultivar Aroona, under zinc deficiency translocation of iron from roots to shoot was significantly decreased in 13- and 15-day-old plants, whereas release of phytosiderophores was enhanced when the plants were 16 days old. As zinc deficiency became more severe in older plants, translocation of iron to the shoot was further decreased and release of phytosiderophores was further enhanced. Resupplying zinc in nutrient solution to zinc-deficient plants significantly increased the translocation of iron to the shoot after 48 and 72 h. Concomitantly, the release of phytosiderophores was repressed. The other cultivar Durati, classified as zinc-inefficient in field observations, differed from cv. Aroona, by showing a lower rate of phytosiderophore release under zinc deficiency, and a less impaired translocation of iron to the shoot. Foliar application of iron citrate to zinc-deficient Aroona plants repressed the release of phytosiderophores and increased iron concentrations in shoot and roots. Application of Fe-55 to the leaves demonstrated that retranslocation of iron from the shoot to the roots was not affected by the zinc nutritional status. It is concluded that enhanced release of phytosiderophores in zinc-deficient wheat plants was induced primarily by impaired translocation of iron to the shoot.