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Effects of elevated carbon dioxide and arbuscular mycorrhizal infection on Trifolium repens
Author(s) -
JONGEN MARJAN,
FAY PETER,
JONES MICHAEL B.
Publication year - 1996
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.1469-8137.1996.tb01861.x
Subject(s) - trifolium repens , glomus , repens , mycorrhiza , biology , arbuscular mycorrhiza , horticulture , phycomycetes , zoology , agronomy , symbiosis , botany , inoculation , bacteria , genetics
summaryTrifolium repens L. cv. aran was grown for 58 d at ambient (350 μol mol −1 ) and elevated (700 μol mol −1 ) atmospheric CO 2 , wish and without the arbuscular mycorrhizal fungus Glomus mosseae (Nicol. & Gerd.) Gerd. & Trappe cv. YV. Plant biomass, mycorrhizal infection, non‐structural carbohydrates, C, N and P content were examined. Elevated CO 2 ( a ) significantly increased above‐ and below‐ground biomass, ( b ) decreased specific leaf area and specific root length, ( c ) decreased tissue %N and increased the C:N ratio, and ( d ) significantly increased total non‐structural carbohydrates. Inoculating T. ripens with Glomus mosseae ( a ) significantly increased above‐ and below‐ground biomass. ( b ) increased the total root length and total leaf area, and ( c ) significantly decreased tissue of Evidence of an increased influence of mycorrhiza on the P nutrition of T. repens at elevated CO 2 was found in the 22%, increase in leaf total P ( P < 005) of mycorrhizal plants grown at elevated CO 2 compared with non‐mycorrhizal plants. No significant interactions were found between CO 2 and mycorrhiza treatments. The proportion of T. repens root length colonized by Glomus mosseae was not affected by CO 2 concentration. The percentage mycorrhizal infection was 29% at ambient CO 2 and 35%, et al elevated CO 2 . However, exposure to elevated CO 2 significantly increased the total mycorrhizal foot length from 3.4 to 6.1 m per plant. The results show little evidence that the role of arbuscular mycorrhiza in the growth and nutrition of T. repens would increase if atmospheric CO 2 were to increase as predicted.