Light affects competition for inorganic and organic nitrogen between maize and rhizosphere microorganisms

Xu, Xingliang; Stange, Claus Florian; Richter, Andreas; Wanek, Wolfgang; Kuzyakov, Yakov

doi:10.1007/s11104-007-9519-7

Cited by 50 publications

(29 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At first glance the data we present seems to contradict previous studies that have shown LMW organic N contributes to the overall N uptake of plants (McKane et al 2002;Näsholm et al 1998;Näsholm et al 2001;Nordin et al 2004;Persson et al 2003;Xu et al 2008). However, the glycine uptake patterns we report for these three Australian ecosystems fit well into Schimel and Bennett's (2004) general conceptual model of LMW organic N uptake across ecosystems with varying N availability and microbial competition.…”

Section: Discussioncontrasting

confidence: 99%

“…A number of studies have therefore tested the uptake of LMW organic N by plants directly from the soil, either in pots or in-situ in intact ecosystems. To date we have evidence for LMW organic N uptake directly from the soil by plants from arctic (Clemmensen et al 2008;Nordin et al 2004), alpine (Miller et al 2007), tundra (McKane et al 2002;Schimel and Chapin 1996) and boreal ecosystems (Näsholm et al 1998;Nordin et al 2001;Persson et al 2003) as well as from improved and unimproved temperate grasslands (Bardgett et al 2003;Harrison et al 2007;Streeter et al 2000) and agricultural soils (Näsholm et al 2000(Näsholm et al , 2001Xu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…In their studies LMW organic N uptake decreases at the expense of inorganic N uptake along a boreal forest productivity gradient and along the transition of an unimproved acidic soil to agriculturally improved grassland, respectively. Alternatively, studies made at the high N end of the N availability gradient have shown LMW organic N uptake by plants in heavily fertilized agricultural ecosystems, where competition between plants and microbes for soil N is limited (Näsholm et al 2001;Xu et al 2008). Given ample evidence from either end of this N availability gradient, it is remarkable that very little information for LMW organic N uptake by plants is available from ecosystems with intermediate N availability where net N mineralization occurs (in contrast to high latitude or alpine ecosystems) but where ecosystems are not N saturated (in contrast to agricultural ecosystems or locations with large inputs from atmospheric deposition).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability

2009

View full text Add to dashboard Cite

The traditional view of the nitrogen (N) cycle has been challenged since the discovery that plants can compete with microbes for low molecular weight (LMW) organic N. Despite a number of studies that have shown LMW organic N uptake by plants, there remains a debate on the overall ecological relevance of LMW organic N uptake by plants across ecosystems with different N availabilities. We here report patterns of glycine N uptake by plants from three different Australian land-use types with intermediate N availability and low inherent glycine concentrations in the soil. Using 15N labeled tracers, we tested the potential of these plants to acquire glycine in ex-situ laboratory experiments and attempted to validate these results in the field by determining actual uptake of glycine by plants directly from the soil. We found in the ex-situ experiments that plants from all three land-use types were able to take up significant amounts of glycine. In contrast, glycine uptake directly from the soil was minimal in all three land-use types and 15 N tracers were largely immobilized in the soil organic N pool. Our study confirms that the potential for LMW organic N uptake by plants is a widespread phenomenon. However, our in-situ experiments show that in the three land-use types tested here plants are inferior competitors for LMW organic N and rely on NH 4 + as their main N source. In contrast to several previous studies in arctic, alpine and even temperate ecosystems, our study suggests that in ecosystems with intermediate N availability, mineral N is the plants' main N source, while LMW organic N is of less ecological relevance to plant N nutrition.

show abstract

Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability

2009

View full text Add to dashboard Cite

show abstract

“…However, mycorrhizal effect on metabolic changes (Subramanian and Charest 1995 ) and modifi ed N assimilation pathways (Subramanian and Charest 1998 ) as shown earlier can also infl uence the size of host plants. The AM fungi could therefore to a certain extent replace genetic engineering and plant breeding techniques (Xu et al 2008 ;Grover et al 2011 ) by modifying the crop plant physiology as well as biochemical responses (Kohler et al 2008 ;Grover et al 2011 ) to stress tolerance. For example, AM fungal association has been shown to increase the stomatal conductance of mycorrhizal mutant bean ( Phaseolus vulgaris ) than non-mycorrhizal under water defi cit condition (Augé 2004 ).…”

Section: Water Relationsmentioning

confidence: 99%

Insight into the Role of Arbuscular Mycorrhizal Fungi in Sustainable Agriculture

Priyadharsini

Muthukumar

2014

Environmental Sustainability

View full text Add to dashboard Cite

Sustainable agriculture plays a vital role in agroecosystems and reduces adverse effects on the environment by utilizing the various natural processes. Optimum soil fertility is an essential goal to be achieved in sustainable agriculture system. The presence of benefi cial microorganisms in the rhizospheric region and their activities are the main focal point which makes dynamic resources available to plants and conserve soil fertility. Majority of the agricultural and horticultural crops are associated with common soil fungi, the arbuscular mycorrhizal (AM) fungi. These fungi are crucial for plant health and fi tness as they increase the effi ciencies of the plant root systems. The hyphae of these fungi originating from roots grow into the soil and absorb nutrients especially phosphorus and deliver it to the roots. They also play a crucial role in imparting tolerance to plants against various stresses as well as modifying soil structure. Nevertheless, several agricultural practices involved in crop production can infl uence both AM formation and function. Consequently, AM fungal introductions or changes in crop management practices that enhance the proliferation, diversity and function of native AM fungi become essential. Optimization of agronomic practices that sustain maximum AM fungal presence and activity would enable to achieve increased plant production in sustainable agriculture.

show abstract

“…The possibility of root uptake of inorganic 14 C or 13 C is not discussed in these studies (e.g. Streeter et al, 2000;Rains and Bledsoe, 2007;Xu et al, 2008;Biernath et al, 2008). However, root uptake of HCO 3 À and its incorporation into plant tissue C via phosphoenolpyruvate carboxylase (PEP carboxylase) is well documented (Cramer and Lips, 1995;Wanek and Popp, 2000;Ford et al, 2007).…”

Section: Dear Editormentioning

confidence: 99%

Appendix A: Supplementary Material

Moudgalya

2007

Digital Control

View full text Add to dashboard Cite

Light affects competition for inorganic and organic nitrogen between maize and rhizosphere microorganisms

Cited by 50 publications

References 75 publications

High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability

High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability

Insight into the Role of Arbuscular Mycorrhizal Fungi in Sustainable Agriculture

Appendix A: Supplementary Material

Contact Info

Product

Resources

About