Symbiotic N2 fixation response to drought

Serraj, Rachid; Sinclair, Thomas R.; Purcell, Larry C.

doi:10.1093/jxb/50.331.143

Cited by 252 publications

(325 citation statements)

References 119 publications

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“…Not only is the water input critical in sustaining the activity of the nodules, delivery of photosynthate from the leaves provides the energy resource to support the high energy process of N fixation. Xylem flow is also essential to remove the accumulating N products (Walsh et al 1989) in the nodule to prevent feedback inhibition of N fixation activity (Serraj et al 1999a). Without the continuous circulation of water to and from the nodules, N fixation activity cannot be sustained.…”

Section: Symbiotic Nitrogen Fixationmentioning

confidence: 99%

The future of grain legumes in cropping systems

Sinclair

Vadez

2012

Crop Pasture Sci.

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Abstract. Grain legume production is increasing worldwide due to their use directly as human food, feed for animals, and industrial demands. Further, grain legumes have the ability to enhance the levels of nitrogen and phosphorus in cropping systems. Considering the increasing needs for human consumption of plant products and the economic constraints of applying fertiliser on cereal crops, we envision a greater role for grain legumes in cropping systems, especially in regions where accessibility and affordability of fertiliser is an issue. However, for several reasons the role of grain legumes in cropping systems has often received less emphasis than cereals. In this review, we discuss four major issues in increasing grain legume productivity and their role in overall crop production: (i) increased symbiotic nitrogen fixation capacity, (ii) increased phosphorus recovery from the soil, (iii) overcoming grain legume yield limitations, and (iv) cropping systems to take advantage of the multi-dimensional benefits of grain legumes.

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Section: Symbiotic Nitrogen Fixationmentioning

confidence: 99%

The future of grain legumes in cropping systems

Sinclair

Vadez

2012

Crop Pasture Sci.

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“…1). In some species, N 2 fixation is especially sensitive to even modest soil drying and reductions in N 2 fixation are observed before effects on transpiration or photosynthesis are apparent (Serraj et al, 1999). Despite considerable attention, the causes of drought-induced inhibition of N 2 fixation are still not well understood.…”

Section: Will Elevated [Co 2 ] Help Legumes Avoid Drought-induced Redmentioning

confidence: 99%

“…Despite considerable attention, the causes of drought-induced inhibition of N 2 fixation are still not well understood. There are a number of mechanisms proposed to account for the reduction in N 2 fixation under drought stress: (1) oxygen limitation, (2) C shortage, (3) regulation by N metabolism, and (4) oxidative damage of cellular components in the nodules (Serraj et al, 1999;Galvez et al, 2005;Ladrera et al, 2007;Marino et al, 2007;Naya et al, 2007). A detailed review of these mechanisms is beyond the scope of this Update.…”

Section: Will Elevated [Co 2 ] Help Legumes Avoid Drought-induced Redmentioning

confidence: 99%

“…Drought-associated decreases in N 2 fixation have been linked to increases in ureides, amides, and other amino acids in the leaf and nodule, and there is evidence for both a systemic and local feedback on N 2 fixation that is associated with N metabolites (Serraj et al, 1999). Growth at elevated [CO 2 ] would provide more C skeletons to metabolize foliar ureides and amides, and the increased N sink at elevated [CO 2 ] would stimulate ureide catabolism and reduce the leaf N-derived signal.…”

Section: Will Elevated [Co 2 ] Help Legumes Avoid Drought-induced Redmentioning

confidence: 99%

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Will Elevated Carbon Dioxide Concentration Amplify the Benefits of Nitrogen Fixation in Legumes?

2009

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“…5). According to Serraj et al (1999), when the shoot N demand decreases, the concentration of N-transporting solutes declines with a consequent accumulation of products associated with the N 2 fixation (ureides) in the nodules that leads to inhibition of nitrogenase activity in the bacteroids. The fact that leaves of plants exposed to elevated CO 2 had lower TSP and specially Rubisco protein content suggests that shoot N demand of those plants was lower, with the consequent inhibition of nodule activity, as also described by Serraj et al (1998).…”

Section: Discussionmentioning

confidence: 99%

Elevated CO2 and water-availability effect on gas exchange and nodule development in N2-fixing alfalfa plants

Aranjuelo

Irigoyen

Nogués

et al. 2009

Environmental and Experimental Botany

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a b s t r a c t N 2 -fixing alfalfa plants were grown in controlled conditions at different CO 2 levels (350 mol mol −1 versus 700 mol mol −1 ) and water-availability conditions (WW, watered at maximum pot water capacity versus WD, watered at 50% of control treatments) in order to determine the CO 2 effect (and applied at two water regimes) on plant growth and nodule activity in alfalfa plants. The CO 2 stimulatory effect (26% enhancement) on plant growth was limited to WW plants, whereas no CO 2 effect was observed in WD plants. Exposure to elevated CO 2 decreased Rubisco carboxylation capacity of plants, caused by a specific reduction in Rubisco (EC 4.1.1.39) concentration (11% in WW and 43% in WD) probably explained by an increase in the leaf carbohydrate levels. Plants grown at 700 mol mol −1 CO 2 maintained control photosynthetic rates (at growth conditions) by diminishing Rubisco content and by increasing nitrogen use efficiency. Interestingly, our data also suggest that reduction in shoot N demand (reflected by the TSP and especially Rubisco depletion) affected negatively nodule activity (malate dehydrogenase, EC 1.1.1.37, and glutamate-oxaloacetate transaminase, EC 2.6.1.1, activities) particularly in water-limited conditions. Furthermore, nodule DM and TSS data revealed that those nodules were not capable to overcome C sink strength limitations.

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Symbiotic N2 fixation response to drought

Cited by 252 publications

References 119 publications

The future of grain legumes in cropping systems

The future of grain legumes in cropping systems

Will Elevated Carbon Dioxide Concentration Amplify the Benefits of Nitrogen Fixation in Legumes?

Elevated CO2 and water-availability effect on gas exchange and nodule development in N2-fixing alfalfa plants

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