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Nitrogen uptake and growth of wheat during O 2 deficiency in root media containing NO 3 − only, or NO 3 − plus NH 4 +
Author(s) -
BUWALDA F.,
GREENWAY H.
Publication year - 1989
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1989.tb00677.x
Subject(s) - nitrogen , chemistry , aeration , nutrient , growth rate , zoology , nuclear chemistry , horticulture , biology , mathematics , geometry , organic chemistry
summary The effects of hypoxia at 0.003 mol O 2 m −3 on growth and nitrogen uptake of wheat seedlings ( Triticum aestivum L. ev. Gamenya) was compared between plants growing in nutrient solutions containing either NO 3 − only, or NO 3 − plus NH 4 + . Hypoxia reduced the uptake of N by the plants, however both at 0.28–0.31 mol O 2 m −3 (aerated solutions) and 0.003 mol O 2 m −3 , rates of N uptake from solutions containing NO 3 − plus NH 4 + were 34% higher than from solutions containing NO 3 − only. In aerated solutions, growth was faster when NO 3 − plus NH 4 + was supplied. By contrast, at 0.003 mol O 2 m −3 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 3 − plus NH 4 + . It is concluded that N nutrition did not limit growth at 0.003 mol O 2 m −3 in either N treatment. Other possible causes of the growth reduction and differences in uptake characteristics between NO 3 − and NH 4 + are discussed.