Nutrient Dilution by Starch in CO<sub>2</sub>-enriched Chrysanthemum

Kuehny, Jeff S.; Peet, Mary M.; Nelson, Paul V.; Willits, D. H.

doi:10.1093/jxb/42.6.711

Cited by 74 publications

(48 citation statements)

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“…Such suppression of mineral accumulation under high CO2 coincided with the findings of Kuehny et al (1991) in chrysanthemum . They ascribed the phenomenon to the dulution effect by excessive starch accumulation through extensive photosynthesis under high CO2.…”

Section: (62)supporting

confidence: 83%

Effects of Atmospheric Partial Pressure of CO2 and Phosphorus Nutrition on Growth of Young Rice Plants.

Imai

Adachi

1996

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Section: (62)supporting

confidence: 83%

Effects of Atmospheric Partial Pressure of CO2 and Phosphorus Nutrition on Growth of Young Rice Plants.

Imai

Adachi

1996

ecb

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“…The dilution effect on plant N status produced by growth in elevated pCO 2 can result either from increasing dilution of a given N supply (Coleman et al, 1993) or by increased carbohydrate accumulation diluting the [N] within the plant (Wong, 1990;Kuehny et al, 1991). Complications can arise if changes in SLA are not taken into account.…”

Section: Discussionmentioning

confidence: 99%

Does a Low Nitrogen Supply Necessarily Lead to Acclimation of Photosynthesis to Elevated CO2?

1998

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Long-term exposure of plants to elevated partial pressures of CO 2 (pCO 2 ) often depresses photosynthetic capacity. The mechanistic basis for this photosynthetic acclimation may involve accumulation of carbohydrate and may be promoted by nutrient limitation. However, our current knowledge is inadequate for making reliable predictions concerning the onset and extent of acclimation. Many studies have sought to investigate the effects of N supply but the methodologies used generally do not allow separation of the direct effects of limited N availability from those caused by a N dilution effect due to accelerated growth at elevated pCO 2 . To dissociate these interactions, wheat (Triticum aestivum L.) was grown hydroponically and N was added in direct proportion to plant growth. Photosynthesis did not acclimate to elevated pCO 2 even when growth was restricted by a low-N relative addition rate. Ribulose-1, 5-bisphosphate carboxylase/oxygenase activity and quantity were maintained, there was no evidence for triose phosphate limitation of photosynthesis, and tissue N content remained within the range recorded for healthy wheat plants. In contrast, wheat grown in sand culture with N supplied at a fixed concentration suffered photosynthetic acclimation at elevated pCO 2 in a low-N treatment. This was accompanied by a significant reduction in the quantity of active ribulose-1, 5-bisphosphate carboxylase/oxygenase and leaf N content.Growth at elevated pCO 2 frequently brings about change in plant physiology that is commonly interpreted as acclimation (Drake et al., 1997). Photosynthesis is inextricably involved because CO 2 is the substrate in C 3 species that is limiting at the current atmospheric pCO 2 . However, results from investigations on the effects of elevated pCO 2 on photosynthesis have been inconsistent. The stimulatory response brought about when pCO 2 is suddenly increased (Long, 1991) has often been found to decline with increasing duration of exposure (for review, see Gunderson and Wullschleger, 1994;Sage, 1994; Drake et al., 1997), but some experiments have failed to find any long-term effect, either in controlled environments (Radoglou and Jarvis, 1990;Wong, 1990) or in the field (Arp and Drake, 1991;Jones et al., 1995;Pinter et al., 1996). Why, then, is the acclimatory response so varied? Species differences can no doubt account for some of the variability, but often the same species in apparently similar conditions can yield different results with different investigators (Sage, 1994). This fact in itself suggests that there may be some uncontrolled factor(s) in the experimental design that may be crucial to the acclimatory response of photosynthesis.Evidence that additional factors may be interacting with the CO 2 response was brought to prominence by Arp (1991), who, after reviewing the data from several investigations using a variety of experimental designs, suggested that root restriction by pot size had a significant effect on the acclimatory response. Limited rooting volume was suggested to creat...

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“…As recently discussed by Stitt & Krapp (1999), reductions in nutrient concentrations have been interpreted differently. Decreased nutrient concentrations might result from soil-nutrient limitations that sometimes plague pot studies (McConnaughay et al, 1993), from higher nutrient use efficiencies (Rogers et al, 1997, or from dilution of nutrients by the accumulation of total nonstructural carbohydrates (TNC) (Kuehny et al, 1991). However, decreased nutrient concentrations often persist even when TNC are subtracted.…”

Section: Nutrient Uptakementioning

confidence: 99%

Spatial and temporal deployment of crop roots in CO₂‐enriched environments

2000

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 Growth of crops in CO# -enriched atmospheres typically results in significant changes in root growth and development. Increased root carbohydrates stimulate root growth either directly (functioning as substrates) or indirectly (functioning as signal molecules) by enhancing cell division or cell expansion, or both. Although highly variable, the literature suggests that, generally, initiation and stimulation of lateral roots is favored over the elongation of primary roots, leading to more highly branched, shallower root systems. Such architectural shifts can render root systems less efficient, perhaps contributing to the lower specific root activities often reported. Allocation of carbon (C) to roots fluctuates through the life of the plant ; root functional and growth responses should therefore not be viewed as static. In annual crops, C allocation to belowground processes changes as vegetative growth switches to reproduction and maturation. Reductions in C allocation to roots over time might cause temporal shifts in root deployment, perhaps affecting root demography. However, significant changes in root turnover (defined here as root flux or mortality relative to total root pool size) as a result of decreased root longevities in crop plants are unlikely. Consideration of changing C allocation to roots, a more thorough understanding of the mechanistic controls on root longevity, and a better characterization of the rooting habits (life histories) of different crop species will further our understanding of how increasing atmospheric [CO # ] will affect root demography. This knowledge will lead the way toward a more thorough understanding of the linkage of atmosphere with belowground plant function and also that of plant function with soil biology and structure. Ultimately, successful modeling of global C and nitrogen (N) cycles will require empirical data concerning spatial and temporal deployment of roots for a range of crop species grown under different agricultural management systems.

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Nutrient Dilution by Starch in CO₂-enriched Chrysanthemum

Cited by 74 publications

References 0 publications

Effects of Atmospheric Partial Pressure of CO2 and Phosphorus Nutrition on Growth of Young Rice Plants.

Effects of Atmospheric Partial Pressure of CO2 and Phosphorus Nutrition on Growth of Young Rice Plants.

Does a Low Nitrogen Supply Necessarily Lead to Acclimation of Photosynthesis to Elevated CO2?

Spatial and temporal deployment of crop roots in CO₂‐enriched environments

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Nutrient Dilution by Starch in CO2-enriched Chrysanthemum

Cited by 74 publications

References 0 publications

Effects of Atmospheric Partial Pressure of CO2 and Phosphorus Nutrition on Growth of Young Rice Plants.

Effects of Atmospheric Partial Pressure of CO2 and Phosphorus Nutrition on Growth of Young Rice Plants.

Does a Low Nitrogen Supply Necessarily Lead to Acclimation of Photosynthesis to Elevated CO2?

Spatial and temporal deployment of crop roots in CO2‐enriched environments

Contact Info

Product

Resources

About

Nutrient Dilution by Starch in CO₂-enriched Chrysanthemum

Spatial and temporal deployment of crop roots in CO₂‐enriched environments