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Uptake and transport of foliar applied zinc (65Zn) in bread and durum wheat cultivars differing in zinc efficiency

机译：锌效率不同的面包和硬质小麦品种中叶面施用的锌（65 Zn）的吸收和运输

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Using two bread wheat (Triticum aestivum) and two durum wheat (Triticum durum) cultivars differing in zinc (Zn) efficiency, uptake and translocation of foliar-applied 65Zn were studied to characterize the role of Zn nutritional status of plants on the extent of phloem mobility of Zn and to determine the relationship between phloem mobility of Zn and Zn efficiency of the used wheat cultivars. Irrespective of leaf age and Zn nutritional status of plants, all cultivars showed similar Zn uptake rates with application of 65ZnSO4 to leaf strips in a short-term experiment. Also with supply of 65ZnSO4 by immersing the tip (3 cm) of the oldest leaf of intact plants, no differences in Zn uptake were observed among and within both wheat species. Further, Zn nutritional status did not affect total uptake of foliar applied Zn. However, Zn-deficient plants translocated more 65Zn from the treated leaf to the roots and remainder parts of shoots. In Zn-deficient plants about 40% of the total absorbed 65Zn was translocated from the treated leaf to the roots and remainder parts of shoots within 8 days while in Zn-sufficient plants the proportion of the translocated 65Zn of the total absorbed 65Zn was about 25%. Although differences in Zn efficiency existed between the cultivars did not affect the translocation and distribution of 65Zn between roots and shoots. Bread wheats compared to durum wheats, tended to accumulate more 65Zn in shoots and less 65Zn in roots, particularly under Zn-deficient conditions. The results indicate that differences in expression of Zn efficiency between and within durum and bread wheats are not related to translocation or distribution of foliar-applied 65Zn within plants. Differential compartementation of Zn at the cellular levels is discussed as a possible factor determining genotypic variation in Zn efficiency within wheat.
机译：利用两个锌（Zn）效率不同的面包小麦（Triticum aestivum）和两个硬质小麦（Triticum durum），研究了叶面施用65 Zn的吸收和转运，以表征植物中Zn营养状态的作用。锌的韧皮部迁移率的范围，并确定锌的韧皮部迁移率与所用小麦品种的锌效率之间的关系。在短期实验中，不论叶片年龄和植物的锌营养状况如何，在叶片上施用65 ZnSO4 后，所有品种的锌吸收率均相似。同样，通过浸入完整植物最老叶的尖端（3厘米）来供应65 ZnSO4 ，在两种小麦之间以及两种小麦内部均未观察到锌吸收的差异。此外，锌的营养状况不影响叶面施用锌的总摄入量。但是，缺锌植物将更多的65 Zn从处理过的叶子移到根部和芽的其余部分。缺锌植物中，吸收的总65 Zn中约40％在8天之内从处理过的叶片转移到根部和芽的其余部分，而在缺锌植物中，转移的65 的比例吸收的全部65 Zn中的> Zn约为25％。尽管不同品种间锌效率存在差异，但并不影响65Zn在根与芽之间的转运和分布。与硬粒小麦相比，面包小麦倾向于在茎中积累更多的65 Zn，而在根部积累更少的65 Zn，特别是在缺锌条件下。结果表明，硬粒小麦和面包小麦之间和内部的锌效率表达差异与叶面施用65 Zn在植物体内的转运或分布无关。锌在细胞水平上的差异区被讨论为决定小麦内锌效率基因型变异的可能因素。

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