Conifer root discrimination against soil nitrate and the ecology of forest succession

Kronzucker, Herbert J.; Siddiqi, M. Yaeesh; Glass, Anthony D. M.

doi:10.1038/385059a0

Cited by 451 publications

(343 citation statements)

References 27 publications

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“…Data from several experiments were pooled (n 16) for calculations of means and SE. These values were used for plotting the representative concentrationdependent curves as well as for calculating V max and K m values according to a method described elsewhere (Kronzucker et al, 1996(Kronzucker et al, , 1997.…”

Section: Influx Experimentsmentioning

confidence: 99%

Comparative kinetic analysis of ammonium and nitrate acquisition by tropical lowland rice: implications for rice cultivation and yield potential

et al. 2000

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Nitrogen limitation compromises the realization of yield potential in cereals more than any other single factor. In rice, the world's most important crop species, the assumption has long been that only ammonium-N is efficiently utilized. Consequently, nitrate utilization has been largely ignored, although fragmentary data have suggested that growth could be substantial on nitrate. Using the short-lived radiotracer "$N, we here provide direct comparisons of root transmembrane fluxes and cytoplasmic pool sizes for nitrate-and ammonium-N in a major variety of Indica rice (Oryza sativa), and show that nitrate acquisition is not only of high capacity and efficiency but is superior to that of ammonium. We believe our results have implications for rice breeding and molecular genetics as well as the design of water-management and fertilization regimes. Potential strategies to harness this hitherto unexplored N-utilization potential are proposed.

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Section: Influx Experimentsmentioning

confidence: 99%

Comparative kinetic analysis of ammonium and nitrate acquisition by tropical lowland rice: implications for rice cultivation and yield potential

et al. 2000

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“…If the effects of N forms are conspicuously different between the males and females, then the variations of the sex ratio and spatial distribution of dioecious plants can be explained accordingly. However, the studies on sex-specific responses to different N forms are scarce (Kronzucker et al 1997;Chen et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Populus deltoides females are more selective in nitrogen assimilation than males under different nitrogen forms supply

Dong

Guo

et al. 2014

Trees

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Key Message Female cuttings of Populus deltoides were sensitive to inorganic nitrogen forms and biased for NO 3 2 -N, whereas males exhibited no obvious preference for nitrogen form in nitrogen fertilizations. Abstract We investigated the effects of different inorganic nitrogen forms (NO 3 --N and NH 4 ? -N) on the morphology, physiology, and carbohydrate accumulation of male and female Populus deltoides. Results showed that both NO 3 --N and NH 4 ? -N supply forms significantly increased plant growth, C and N contents of all plant organs, chlorophyll pigment contents, net photosynthesis rates (P n ), and instantaneous photosynthetic N-use efficiencies (PNUE) in the leaves of both male and female P. deltoides. Females exhibited high total plant dry mass accumulation, P n , PNUE, and N contents in leaves but lower non-structure carbohydrate accumulation than males under nitrate treatment. However, males showed significantly higher P n , PNUE, and 15 NH 4 ? in the leaves, free amino acid content, and nitrate reductase (NR) activities than females under each nitrogen form supply treatment.These results suggested that male and female P. deltoides used different adaptive strategies in dry mass accumulation, allocation, and exhibited different interactions between nitrogen and carbon metabolism. Males exhibited higher nitrogen assimilation ability and N-use efficiency than females under nitrogen fertilizations, whereas females showed more sensitivity to inorganic nitrogen forms of treatments and distinct preference for NO 3 --N. Male P. deltoides showed no obvious bias to the two different N forms. Therefore, the different preferences of male and female P. deltoides of N supplied forms can serve as an important strategy for minimizing intraspecific competition between the two genders.

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“…It was shown that root uptake of NO $ − in particular, but also of NH % + , was low in a stand subjected to high loads of N and that this phenomenon could also be induced by N application to a forest with relatively low N-inputs. Preferential use of NH % + , and inhibition of uptake of NO $ − by NH % + had earlier been shown for conifers (Marschner, Ha$ ussling & George, 1991 ;Flaig & Mohr, 1992 ;Gezelius & Na$ sholm, 1993 ;Kronzucker, Siddiqi & Glass, 1997). It seems clear that trees can decrease N-uptake rates and thereby, at least partly, counteract effects of high loads of N. The mechanism behind such down-regulation of N uptake is not clear.…”

mentioning

confidence: 88%

“…As discussed above, most data indicate that conifers (Kronzucker et al, 1997), as well as many ericaceous species have a preferential uptake of NH % + and are weak competitors for NO $ − . Increased rates of nitrification or increased input of NO $ − through deposition might therefore create a situation where other groups of plants are more competitive, and this might be especially important for understorey plants or for forest trees upon forest regeneration.…”

Section:  mentioning

confidence: 99%

Qualitative and quantitative changes in plant nitrogen acquisition induced by anthropogenic nitrogen deposition

Näsholm

1998

New Phytologist

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Because nitrogen is the mineral nutrient needed in largest amounts by plants, it is usually also the limiting factor for plant growth in terrestrial ecosystems (Vitousek & Howarth, 1991). Consequently, the deposition of oxidized and reduced N compounds will almost invariably have large effects in these systems, and because N availability not only regulates plant growth but also that of organisms at other trophic levels, disturbances of several ecosystem processes might occur. The alternations introduced by deposition of atmospheric N compounds are both of a quantitative and of a qualitative nature. Moreover, N deposition can have phytotoxic as well as growth-stimulating effects.This short commentary gives a personal view of some of the possible consequences of N deposition on plants. It refers particularly to the oral presentations given by Professor Heinz Rennenberg and Dr Marta Pere! z-Soba, and to the discussions held after their talks where appropriate. Separate attention is given to four different consequence of anthropogenic N-deposition : N-availability ; N-form, N-uptake by the shoot, and the period of N-uptake. Finally, I have tried to adopt an ecosystem perspective and discuss briefly the concept of critical loads of N.  The talk given by Professor Rennenberg focused on consequences of high loads of N for spruce and beech trees. It was shown that root uptake of NO $ − in particular, but also of NH % + , was low in a stand subjected to high loads of N and that this phenomenon could also be induced by N application to a forest with relatively low N-inputs. Preferential use of NH % + , and inhibition of uptake of NO $ − by NH % + had earlier been shown for conifers (Marschner, Ha$ ussling & George, 1991 ;Flaig & Mohr, 1992 ;Gezelius & Na$ sholm, 1993 ;Kronzucker, Siddiqi & Glass, 1997). It seems clear that trees can decrease N-uptake rates and thereby, at least partly, counteract effects of high loads of N. The mechanism behind such down-regulation of N uptake is not clear. Professor Rennenberg showed that N uptake rates of roots were inversely proportional to concentrations of some amino acids in phloem tissue of roots. Best fit was achieved for Glu and Gln whereas Arg, the other major nitrogenous constituent of the phloem, did not correlate with uptake rates of N. These observations suggest that Glu and\or Gln might have a role in regulating N uptake, although a correlation should not, of course, be interpreted as a causal relationship without further evidence, and more detailed studies on the regulation of N uptake rates would be helpful.High loads of N did not seem to affect trees negatively ; on the contrary, the trees were found to be growing vigorously. Information was given that the stand under investigation was not suffering from mineral nutrient deficiencies, indicating that soil supply of nutrients such as phosphorus and potassium could match the high rates of N supply. So one may ask -is there a problem with high loads of N ? Data presented showing high levels o...

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Conifer root discrimination against soil nitrate and the ecology of forest succession

Cited by 451 publications

References 27 publications

Comparative kinetic analysis of ammonium and nitrate acquisition by tropical lowland rice: implications for rice cultivation and yield potential

Comparative kinetic analysis of ammonium and nitrate acquisition by tropical lowland rice: implications for rice cultivation and yield potential

Populus deltoides females are more selective in nitrogen assimilation than males under different nitrogen forms supply

Qualitative and quantitative changes in plant nitrogen acquisition induced by anthropogenic nitrogen deposition

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