A role of vesicular-arbuscular (VA) mycorrhizal fungi in facilitating interplant nitrogen transfer

Frey, Beat; Schüepp, H.

doi:10.1016/0038-0717(93)90104-j

Cited by 61 publications

(36 citation statements)

References 34 publications

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“…Nitrogen transfer between plants can take place by direct or indirect routes (McNeill & Wood, 1990). Direct N transfer occurs through mycorrhizal connections among plants (Newman, 1988; Frey & Schuepp, 1993; Simard et al ., 2002; He et al ., 2003, 2004, 2005; Leake et al ., 2004; Simard & Durall, 2004). However, amounts of N transferred were low and may not be ecologically relevant (Newman, 1988; Simard et al ., 2002; He et al ., 2003; Leake et al ., 2004; Simard & Durall, 2004).…”

Section: Discussionmentioning

confidence: 99%

Rapid nitrogen transfer from ectomycorrhizal pines to adjacent ectomycorrhizal and arbuscular mycorrhizal plants in a California oak woodland

Bledsoe

Zasoski

et al. 2006

New Phytologist

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Summary• Nitrogen transfer among plants in a California oak woodland was examined in a pulse-labeling study using 15 N. The study was designed to examine N movement among plants that were mycorrhizal with ectomycorrhizas (EM), arbuscular mycorrhizas (AM), or both.• Isotopically enriched N (K 15 NO 3 -) was applied to gray pine ( Pinus sabiniana ) foliage (donor) and traced to neighboring gray pine, blue oak ( Quercus douglasii ), buckbrush ( Ceanothus cuneatus ) and herbaceous annuals ( Cynosurus echinatus , Torilis arvensis and Trifolium hirtum ).• After 2 wk, needles of 15 N-treated pines and foliage from nearby annuals were similarly enriched, but little 15 N had appeared in nontreated (receiver) pine needles, oak leaves or buckbrush foliage. After 4 wk foliar and root samples from pine, oak, buckbrush and annuals were significantly 15 N-enriched, regardless of the type of mycorrhizal association.• The rate of transfer during the first and second 2-wk periods was similar, and suggests that 15 N could continue to be mobilized over longer times.

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Section: Discussionmentioning

confidence: 99%

Rapid nitrogen transfer from ectomycorrhizal pines to adjacent ectomycorrhizal and arbuscular mycorrhizal plants in a California oak woodland

Bledsoe

Zasoski

et al. 2006

New Phytologist

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“…Controlled studies have shown a significant direct transfer of fixed-N to the associated non-legume species (Eaglesham et al 1981;Giller et al 1991;Frey and Schüepp 1993;Stern 1993;Chu et al 2004). There is evidence that mineralization of decomposing legume roots in the soil can increase N availability to associated crops (Schroth 1995).…”

Section: Effects Of Hedges/barriers On Soil Conservation and Maize Crmentioning

confidence: 97%

Combining napier grass with leguminous shrubs in contour hedgerows controls soil erosion without competing with crops

et al. 2008

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We established hedges/barriers of calliandra (Calliandra calothyrsus Meissner), leucaena (Leucaena trichandra (Zucc.) Urban)) and napier grass (Pennisetum purpureum Schumach) and combination hedges of either calliandra or leucaena with napier grass on slopes exceeding 5% to study the effect of vegetative barriers on productivity of arable steeplands in central Kenya. Hedges/barriers were pruned regularly and biomass incorporated into the plots. Hedge plots were monitored for soil fertility, soil losses and maize crop yield changes. Inorganic-N concentration in the tree hedge plots was higher than in the control and napier barrier plots after 20 months. Napier grass barriers were the most effective in reducing erosion losses across the two seasons. The effectiveness of napier grass to significantly reduce soil erosion was detectable in one year old napier barriers. Soil loss from all the other one year old vegetative treatments was similar to soil loss from the control. Seventeen month old combination hedge plots recorded lower soil losses than tree hedges of the same age (P = 0.012). Maize crop yields throughout the trial period were high and similar for leguminous and combination hedge plots, but lower in the napier grass and control plots. Overall, we observed that the combination hedges seemed to provide a win-win scenario of reduction in soil erosion combined with improvement of maize crop yields and soil fertility enhancement. We conclude that vegetative hedges have a potential for improving soil productivity in arable steep-lands of the central highlands of Kenya, and that in adoption of vegetative hedges for this purpose there are trade-offs between soil conservation, soil fertility and maize crop yields to be considered.

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“…The hypothesis on one-way N transfer via CMN is based on the assumption that N flows from the N-rich legume to the N-poor non-legume (Bethlenfalvay et al 1991;Frey and Schüepp 1993); recent evidence suggests that N transfer from a N 2 -fixer to a non-N 2 -fixer may be the driven by a N concentration gradient (Jalonen et al 2009b). However, bidirectional N transfer has also been shown between a herbaceous legume and an associated grass in semi-controlled conditions (Høgh-Jensen and Schjoerring 2000) and in the field (Gylfadóttir et al 2007), and between a N 2 -fixing and a non-N 2 -fixing tree under controlled conditions (He et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Detection of nitrogen transfer from N2-fixing shade trees to cacao saplings in 15N labelled soil: ecological and experimental considerations

2010

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Theobroma cacao seedlings were grown alone (TCA) or associated with saplings of N 2 -fixing shade trees Gliricidia sepium and Inga edulis in 200 l of 15 N labelled soil within a physical root barrier for studying direct nitrogen transfer between the trees and cacao. Root:shoot partitioning ratio for sapling total N was lower than biomass root:shoot ratio in all species. Sapling total 15 N was partitioned between root and shoot in about the same ratio as total N in cacao and inga but in gliricidia much higher proportion of 15 N than total N was found in roots. Thus, whole plant harvesting should be used in 15 N studies whenever possible. Average percentage of fixed N out of total tree N was 74 and 81% for inga estimated by a yield-independent and yield-dependent method, respectively, and 85% for gliricidia independently of estimation method. Strong isotopic evidence on direct N transfer from trees to cacao was observed in two cases out of ten with both tree species. Direct N transfer was not correlated with mycorrhizal colonisation of either donor or receiver plant roots. Direct N transfer from inga and gliricidia to cacao is conceivable but its prevalence and the transfer pathway via mycorrhizal connections or via reabsorption of N-rich legume root exudates by cacao require further study. Competition in the restricted soil space may also have limited the apparent transfer in this study because the trees accumulated more soil-derived N than cacao in spite of active N 2 fixation.

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A role of vesicular-arbuscular (VA) mycorrhizal fungi in facilitating interplant nitrogen transfer

Cited by 61 publications

References 34 publications

Rapid nitrogen transfer from ectomycorrhizal pines to adjacent ectomycorrhizal and arbuscular mycorrhizal plants in a California oak woodland

Rapid nitrogen transfer from ectomycorrhizal pines to adjacent ectomycorrhizal and arbuscular mycorrhizal plants in a California oak woodland

Combining napier grass with leguminous shrubs in contour hedgerows controls soil erosion without competing with crops

Detection of nitrogen transfer from N2-fixing shade trees to cacao saplings in 15N labelled soil: ecological and experimental considerations

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