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ROOT HAIRS AND PLANT GROWTH ATLOW NITROGEN AVAILABILITIES
Author(s) -
ROBINSON DAVID,
RORISON I. H.
Publication year - 1987
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.1469-8137.1987.tb00906.x
Subject(s) - lolium perenne , poa annua , ammonium , nitrogen , biology , root hair , nutrient , botany , holcus lanatus , nitrate , agronomy , horticulture , chemistry , poaceae , ecology , biochemistry , organic chemistry , gene
S ummary Four grass species, Holcus lanatus L., Deschampsia ftexuosa (L.) Trin., Poa annua L. and Lolium perenne L. cv. S.23 and cv. ‘Norlea’ were grown for 28 d in continuous flow nutrient solution containing nitrogen (N) at one of three concentrations (0.02, 0.21 or 4.0 mol m −3 ) as nitrate or ammonium. Growth, N uptake and root hair production were measured. Root hair growth in D. flexuosa and P. annua was the most responsive to low N availability. These responses were generally greater to ammonium than nitrate. The possible effects of the absence of root hairs on growth were tested via empirical relationships between relative growth rates and N inflow rates to estimate the contributions made to growth by root hairs. Only in D. flexuosa at the lowest N concentration were significant contributions found. Nitrate and ammonium had no differential effect in this respect.