在仅含硝酸根或硝酸根加铵根的根系介质缺氧量条件下小麦的氮素吸收与生长

Nitrogen uptake and growth of wheat during O deficiency in root media containing NO only, or NO plus NH.

作者信息

Buwalda F, Greenway H

机构信息

Agronomy Department, School of Agriculture, University of Western Australia, Nedlands, WA 6009, Australia.

出版信息

New Phytol. 1989 Feb;111(2):161-166. doi: 10.1111/j.1469-8137.1989.tb00677.x.

DOI:10.1111/j.1469-8137.1989.tb00677.x

PMID:33874261

Abstract

The effects of hypoxia at 0.003 mol O m on growth and nitrogen uptake of wheat seedlings (Triticum aestivum L. ev. Gamenya) was compared between plants growing in nutrient solutions containing either NO only, or NO plus NH . Hypoxia reduced the uptake of N by the plants, however both at 0.28-0.31 mol O m (aerated solutions) and 0.003 mol O m , rates of N uptake from solutions containing NO plus NH were 34% higher than from solutions containing NO only. In aerated solutions, growth was faster when NO plus NH was supplied. By contrast, at 0.003 mol O m both N treatments had the same low growth rate (expressed on a dry weight basis) despite considerably higher internal N concentrations in the plants supplied with NO plus NH . It is concluded that N nutrition did not limit growth at 0.003 mol O m in either N treatment. Other possible causes of the growth reduction and differences in uptake characteristics between NO and NH are discussed.

摘要

在含仅 NO₃⁻ 或 NO₃⁻ 加 NH₄⁺ 的营养液中生长的小麦幼苗（普通小麦品种 Gamenya），比较了 0.003 mol O₂ m⁻³ 低氧环境对其生长和氮吸收的影响。低氧降低了植株对氮的吸收，然而在 0.28 - 0.31 mol O₂ m⁻³（通气溶液）和 0.003 mol O₂ m⁻³ 条件下，来自含 NO₃⁻ 加 NH₄⁺ 溶液的氮吸收速率比仅含 NO₃⁻ 的溶液高 34%。在通气溶液中，供应 NO₃⁻ 加 NH₄⁺ 时生长更快。相比之下，在 0.003 mol O₂ m⁻³ 时，尽管供应 NO₃⁻ 加 NH₄⁺ 的植株内部氮浓度高得多，但两种氮处理的生长速率（以干重计）相同。得出的结论是，在 0.003 mol O₂ m⁻³ 时，两种氮处理下氮营养均不限制生长。还讨论了生长降低以及 NO₃⁻ 和 NH₄⁺ 吸收特性差异的其他可能原因。