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PLANT GROWTH RESPONSES TO VESICULAR‐ARBUSCULAR MYCORRHIZA V. PHOSPHATE UPTAKE BY THREE PLANT SPECIES FROM P‐DEFICIENT SOILS LABELLED WITH 32 P
Author(s) -
MOSSE B.,
HAYMAN D. S.,
ARNOLD D. J.
Publication year - 1973
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.1469-8137.1973.tb02056.x
Subject(s) - mycorrhiza , soil water , phosphorus , phosphate , biology , ectomycorrhiza , botany , arbuscular mycorrhiza , paspalum notatum , agronomy , symbiosis , chemistry , ecology , bacteria , biochemistry , genetics , organic chemistry
Summary The uptake of phosphorus from 32 P‐labelled soil solution by three plant species, with and without mycorrhiza, was measured. All soils contained very little CaCl 2 ‐ and NaHCO 3 ‐soluble phosphorus. In two soils the specific activity of phosphorus taken up by mycorrhizal and non‐mycorrhizal Melinis minutiflora was very similar, indicating that even in very P‐deficient soils mycorrhizal plants used the same source of phosphate as non‐mycorrhizal. In two other soils non‐mycorrhizal Paspalum notatum and Centrosema pebescens contained no 32 P activity, suggesting that they had not taken up any soil phosphorus, whereas mycorrhizal plants of both species contained 32 P activity and grew much better. It is suggested that non‐mycorrhizal roots of some plant species do not utilize phosphate present at extremely low concentrations in the soil solution, but that mycorrhizal roots or fungal hyphae do. The implications of this finding for the mechanism of phosphate uptake by VA mycorrhiza are discussed.