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Phosphorus modifies the effects of nitrogen on nodulation in split‐root systems of Hippophaë rhamnoides
Author(s) -
Gentili Francesco,
HussDanell Kerstin
Publication year - 2002
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 - 10.1046/j.0028-646x.2001.00283.x
Subject(s) - actinorhizal plant , frankia , nitrogen fixation , biology , inoculation , symbiosis , root nodule , root hair , botany , nodule (geology) , hippophae rhamnoides , ammonium , stimulation , horticulture , chemistry , bacteria , biochemistry , paleontology , genetics , organic chemistry , neuroscience , gene
Summary• The effects of N (ammonium nitrate), P (phosphate) and their interactions on nodulation were studied in the intercellularly infected actinorhizal plant Hippophaë rhamnoides . • A split‐root design, with pots receiving different concentrations of N and P, was used to determine whether the effects of N and P are local or systemic, if they are specific to nodulation or general, and whether P could counteract N inhibition. H. rhamnoides plants were grown for 6–10 wk after inoculation with Frankia . • Inhibition of nodulation by N was systemic for both nodule number and nodule biomass in H. rhamnoides . • By contrast, high P had a systemic stimulation on nodule number and biomass and P prevented systemic, but not local, N inhibition. Stimulation by P was specific to nodulation and not simply mediated via plant growth. Whether N and P alter not only nodulation but also N 2 ‐fixation in the nodules requires further investigation.