TY - JOUR
T1 - Effects of plant roots and arbuscular mycorrhizas on soil phosphorus leaching
AU - Tran, Cuc T.K.
AU - Watts-Williams, Stephanie J.
AU - Smernik, Ronald J.
AU - Cavagnaro, Timothy R.
PY - 2020/6/20
Y1 - 2020/6/20
N2 - While the impact of arbuscular mycorrhizal fungi (AMF) on phosphorus (P) uptake is well understood, the mechanism(s) of how these fungi affect P leaching from soil is still unclear. Here we present results of a study in which we grew a mycorrhiza-defective tomato (Solanum lycopersicum L.) genotype (named rmc) and its mycorrhizal wild-type progenitor (named 76R) in microcosms containing non-sterile soil, to examine the influence of roots and AMF on P leaching. More P was leached from the planted microcosms as compared to the plant-free controls. Further, although there was more plant biomass and greater P uptake in the mycorrhizal plant treatments, these treatments were associated with the most leaching of total P, reactive P, and dissolved organic carbon (DOC). There was a strong correlation between the total P and DOC leached, suggesting that root and fungal exudates may have affected P leaching. These findings provide new insights into the impact of roots and AMF on nutrient leaching in soils.
AB - While the impact of arbuscular mycorrhizal fungi (AMF) on phosphorus (P) uptake is well understood, the mechanism(s) of how these fungi affect P leaching from soil is still unclear. Here we present results of a study in which we grew a mycorrhiza-defective tomato (Solanum lycopersicum L.) genotype (named rmc) and its mycorrhizal wild-type progenitor (named 76R) in microcosms containing non-sterile soil, to examine the influence of roots and AMF on P leaching. More P was leached from the planted microcosms as compared to the plant-free controls. Further, although there was more plant biomass and greater P uptake in the mycorrhizal plant treatments, these treatments were associated with the most leaching of total P, reactive P, and dissolved organic carbon (DOC). There was a strong correlation between the total P and DOC leached, suggesting that root and fungal exudates may have affected P leaching. These findings provide new insights into the impact of roots and AMF on nutrient leaching in soils.
KW - Arbuscular mycorrhizal fungi
KW - Dissolved organic carbon
KW - Mycorrhiza-defective tomato mutant
KW - Phosphorus
KW - Reactive phosphorus
KW - Unreactive phosphorus
UR - http://www.scopus.com/inward/record.url?scp=85081674191&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.137847
DO - 10.1016/j.scitotenv.2020.137847
M3 - Article
C2 - 32199376
AN - SCOPUS:85081674191
SN - 0048-9697
VL - 722
JO - Science of The Total Environment
JF - Science of The Total Environment
M1 - 137847
ER -