Tissue ionome response to rhizosphere pH and aluminum in tea plants (Camellia sinensis L.), a species adapted to acidic soils.
Tissue ionome response to rhizosphere pH and aluminum in tea plants (Camellia sinensis L.), a species adapted to acidic soils.
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DOI：
10.1002/pei3.10028
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Ikka T
中科院分区：
文献类型：
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作者：
Yamashita H;Fukuda Y;Yonezawa S;Morita A;Ikka T
茶树（Camellia sinensis L.）铝是酸性条件下的一种有益元素，但根际pH值对这种相互作用的影响尚不清楚。为了了解适应酸性根际条件的机制，我们评估了离子组分布和pH值对水培茶树生长的影响。茶树生长的最适pH为4.2左右，pH小于3.8或大于5.0时生长较差。在最适pH条件下，铝处理显著促进了生长和铝积累。茶树体内积累矿物质的主要组织新叶、成熟叶和新根中铝的含量和积累量随着pH值的降低而逐渐下降，新根中的铝含量和积累量下降最明显。铝处理显著地改变了离子组分布，但新根中的变化比新叶或成熟叶中的变化更明显，并且不依赖于pH。尽管铝处理降低了新根中大多数阳离子矿物质的吸收，但新叶和成熟叶中的阳离子矿物质含量并没有被铝降低。铝处理显著提高了细胞的增殖能力。这些结果表明，铝作为一种有益元素的作用之一是通过有效利用根部的铝限制元素来维持地上部的营养状况。
The growth of tea plants (Camellia sinensis L.) is promoted by the presence of aluminum (Al), a beneficial element under acidic conditions, but the influence of rhizosphere pH on this interaction is not known. To understand the mechanisms underlying the adaptation to acidic rhizosphere conditions, we evaluated ionome profiles and the effect of pH on tea growth in hydroponic culture. The optimum pH for tea growth was around pH 4.2, and growth was inferior under a pH less than 3.8 or higher than 5.0. Under the optimum pH growth and Al accumulation were markedly stimulated by Al treatment. Al content and accumulation in new and mature leaves and new roots (the predominant tissues that accumulate minerals in tea plants) gradually declined with decrease in pH, especially in new roots. Ionome profiles drastically altered Al treatment, but changes were more pronounced in new roots than in new or mature leaves and did not depend on pH. Although the uptake of most cationic minerals in new roots was decreased by Al treatment, cationic mineral contents in new and mature leaves were not decreased by Al. In contrast to other plant species, the content and accumulation of manganese, despite it being a cationic nutrient, were significantly increased by Al treatment. These results indicated that one role of Al as a beneficial element was to maintain the shoot nutrient status by effectively utilizing Al‐limited elements in the roots.