Ammonium can stimulate nitrate and nitrite reductase in the absence of nitrate in <i>Clematis vitalba</i>

Bungard, R. A.; Wingler, Astrid; Morton, James D.; Andrews, Mitchell; Press, M. C.; Scholes, J. D.

doi:10.1046/j.1365-3040.1999.00456.x

Cited by 62 publications

(63 citation statements)

References 49 publications

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“…Foliar nitrogen concentrations were determined, after a microKjeldahl digestion procedure, by a colorometric assay using a flow injection analysis system (Tecator 5042 Detector and 5012 Analyser, Tecator, UK) as described in Bungard et al (1999).…”

Section: Photosynthetic Gas Exchangementioning

confidence: 99%

Patterns of dynamic irradiance affect the photosynthetic capacity and growth of dipterocarp tree seedlings

2003

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In the deeply shaded understorey of S.E. Asian rain forests the growth and survival of dipterocarp seedlings is limited by their ability to maintain a positive carbon balance. Photosynthesis during sunflecks is an important component of carbon gain in understorey plants. To test the sensitivity of photosynthesis and growth to variation in the pattern of dynamic irradiance, dipterocarp tree seedlings (Shorea leprosula and Hopea nervosa) were grown for 370 days under shaded forest light treatments of equal total daily photosynthetic photon flux density (~3.3 mol m -2 day -1 ), but characterised by either long flecks (LF) or short flecks (SF). Seedling growth was more than 4-fold greater under LF, compared with SF, in both species. Variation in the relative growth rates (RGR) and light saturated rates of photosynthesis (A max ) were strongly positively correlated with the mean duration of sunflecks. Variation in RGR was strongly correlated with greater unit leaf rate growth, indicating that photosynthetic carbon gain per unit leaf area was greater under LF. The accumulation of starch in leaves over the diurnal period was 117% greater in both species under LF, compared with SF. Greater carbon gain in seedlings under LF is likely to have resulted from the combination of (1) greater A max (S. leprosula 35%, H. nervosa 40%), (2) more efficient dynamic photosynthesis, and (3) greater incident photosynthetic quantum yield, compared with seedlings receiving the SF irradiance treatment. The pattern of dynamic irradiance received by seedlings may significantly impact their growth and survival to a previously unrecognised extent, with important consequences for regeneration processes and hence forest structure and composition.

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Section: Photosynthetic Gas Exchangementioning

confidence: 99%

Patterns of dynamic irradiance affect the photosynthetic capacity and growth of dipterocarp tree seedlings

2003

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“…High nitrogen supply favours the conversion of carbohydrates into proteins, which in turn promotes the formation of protoplasm (Arnon, 1972). Nitrogen comprises 7% of total dry matter of plants and is a constituent of many fundamental cell components such as nucleic acids, amino acids, en-zymes, and photosynthetic pigments (Bungard et al, 1999). Ayoub et al(1994) reported that spilt N application had little effect on yield, but decreased lodging and spike population, while grain weight increased.…”

Section: Introductionmentioning

confidence: 99%

Bread wheat varieties as influenced by different nitrogen levels

Hussain

Khan

2006

J. Zhejiang Univ. - Sci. B

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Experiment was conducted to determine the effect of different nitrogen levels on four bread wheat varieties (Triticum aestivum L.) viz. Inqilab-91, Daman-98, Dera-98 and Punjab-96 at Gomal University, Dera Ismail Khan (NWFP), Pakistan during 2000~2001. The experiment was laid out in split plot design having four replications using a net plot size of 2 m×5 m. Nitrogen doses used were 0, 50, 100, 150 and 200 kg/ha. The results showed that different nitrogen levels had significant effects on plant height, total number of plants/m 2 , number of grains/spike, number of spike/m 2 , spike weight, biological yield, grain yield and grain protein content. Maximum plant height, total number of plants/m 2 , number of spikes/m 2 , spike weight, biological yield and grain protein content were observed at 200 kg N/ha. Among wheat varieties Daman-98 had maximum plant height, spike weight, grains/spike, 1000-grain weight, biological yield and grain yield. Inqilab-91 had heavier grains and the most grain protein content, while Dera-98 had the maximum plant population and spikes/m 2 . Grain yield and biological yield were statistically similar at doses of 150 kg N/ha and 200 kg N/ha. However, dose of 200 kg N/ha, compared to dose of 150 Kg N/ha, significantly increased the protein content.

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“…Leaf samples from 10 seedlings in each treatment were analysed for total phenolics, as described above. Total foliar nitrogen and phosphorous concentrations were also determined, after a Kjeldahl digestion procedure, by a colorimetric assay using a flow injection analysis system (Tecator 5042 detector and 5012 analyser Tecator, UK) as described in Bungard et al (1999).…”

Section: Growth Measurements and Chemical Analysismentioning

confidence: 99%

Long- and short-term induction of defences in seedlings of Shorea leprosula (Dipterocarpaceae): support for the carbon:nutrient balance hypothesis

2005

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Abstract:The induction of carbon-based secondary metabolites in leaves following damage has been proposed to be a result of a shift in the carbon:nutrient balance, when growth is limited by nutrients in relation to carbon. Here we test this hypothesis using seedlings of a tropical tree, Shorea leprosula (Dipterocarpaceae). In the short term, we analysed the phenolic content of leaves 7 d after damage on seedlings grown under differing light and nutrient treatments. In the long term, we examined the effect of nutrients, over 12 mo, on leaf phenolic concentration and seedling growth. In both the long and short term, levels of phenolics increased in damaged leaves under low nutrient treatments. No changes in leaf phenolics were detected under high nutrient regimes, or in the short term under low light. In addition, it was found that defoliation of seedlings in high-nutrient environments led to greater rates of leaf production than in undamaged seedlings, suggesting compensation.

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Ammonium can stimulate nitrate and nitrite reductase in the absence of nitrate in Clematis vitalba

Cited by 62 publications

References 49 publications

Patterns of dynamic irradiance affect the photosynthetic capacity and growth of dipterocarp tree seedlings

Patterns of dynamic irradiance affect the photosynthetic capacity and growth of dipterocarp tree seedlings

Bread wheat varieties as influenced by different nitrogen levels

Long- and short-term induction of defences in seedlings of Shorea leprosula (Dipterocarpaceae): support for the carbon:nutrient balance hypothesis

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