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首页> 外文期刊>Plant and Soil >Influence of aluminum and phosphorus on growth and xylem sap composition in Melastoma malabathricum L.
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Influence of aluminum and phosphorus on growth and xylem sap composition in Melastoma malabathricum L.

机译：铝和磷对黑斑病菌生长和木质部汁液组成的影响。

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摘要

Melastoma (Melastoma malabathricum L.) is an aluminum-accumulating woody plant that accumulates more than 10 000 mg kg−1 of aluminum (Al) in mature leaves. The influence of Al and phosphorus (P) applications on plant growth and xylem sap was examined in the present study in order to elucidate the interaction between Al-induced growth enhancement and P nutrition, and to determine the form of Al for translocation from roots to shoots. Although the Al application significantly increased the growth of Melastomaseedlings with the high P pre-treatment, and P concentrations in the leaves and Pi concentrations in the xylem sap regardless of the P pre-treatment, we could not come to the conclusion that a primary cause of the Al-induced growth enhancement in Melastoma is the stimulation of P uptake. The degree of Al-induced growth enhancement corresponded not with the P concentrations but with the Al concentrations in the plant tissue, suggesting that the Al-induced growth enhancement in Melastoma is primarily caused by Al itself in the plant tissue rather than by the stimulation of P uptake. Through the analysis of organic acids and Al in the xylem sap and plant tissue, the form of Al for translocation from roots to shoots was shown to be an Al-citrate complex that was transformed into Al-oxalate complex for Al storage in the leaves. In addition, the xylem sap of Melastoma seedlings grown in the absence of Al contained higher concentrations of malate. In the presence of Al, however, higher concentrations of citrate were found, indicating that Melastoma changes its organic acid metabolism in the presence or absence of Al; more specifically, it increases the synthesis of citrate.
机译：Melastoma（Melastoma malabathricum L.）是一种铝积累性木本植物，在成熟叶片中积累超过10000 mg kg-1 的铝（Al）。为了阐明铝诱导的生长促进和磷营养之间的相互作用，并确定铝从根部转运到根的形态，本研究研究了铝和磷（P）的施用对植物生长和木质部汁液的影响。芽。尽管铝的施用显着提高了P的高预处理水平，无论P预处理如何，叶片中的P浓度和木质部汁液中的Pi浓度均显着提高了美拉丝幼木的生长，但我们无法得出结论，主要原因是Al诱导的黄褐斑生长的增长的原因是对P摄取的刺激。 Al诱导的生长增强的程度与植物组织中的P浓度无关，而与P的浓度相对应，这表明在美拉丝瘤中Al诱导的生长增强主要是由植物组织中的Al本身引起的，而不是由对植物组织的刺激引起的。磷吸收。通过分析木质部汁液和植物组织中的有机酸和铝，从根到芽的易位铝的形式显示为柠檬酸铝复合物，该复合物转化为草酸铝复合物，用于叶片中的铝存储。另外，在不存在Al的情况下生长的黄萎病幼苗的木质部汁液含有较高浓度的苹果酸。然而，在铝的存在下，发现柠檬酸盐的浓度更高，这表明在铝的存在或不存在下，黄褐斑改变了其有机酸的代谢。更具体地说，它增加了柠檬酸盐的合成。

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