Plasticity in the photosynthetic carbon metabolism of submersed aquatic macrophytes

Bowes, George; Salvucci, Michael E.

doi:10.1016/0304-3770(89)90058-2

Cited by 160 publications

(102 citation statements)

References 102 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High saturation points of photosynthesis of phytoelements should therefore be more important for aquatic than for terrestrial community photosynthesis. Nevertheless, aquatic phytoelements mostly resemble shade-acclimated terrestrial leaves having low saturation points (Reiskind et al 1989;Bowes and Salvucci 1989). It has been suggested that constraints on the supply rate of inorganic carbon and nutrients in water contribute to these low saturation points (Nielsen and Sand-Jensen 1989).…”

Section: Discussionmentioning

confidence: 99%

Community photosynthesis of aquatic macrophytes

Binzer

Sand‐Jensen

Middelboe

2006

Limnology & Oceanography

105

View full text Add to dashboard Cite

We compared 190 photosynthesis-irradiance (P-E) experiments with single-and multispecies communities of macroalgae and vascular plants from freshwater and marine habitats. We found a typical hyperbolic P-E relation in all communities and no sign of photosaturation or photoinhibition of photosynthesis at the highest irradiances of about 2,000 mmol m 22 s 21 . Macrophyte communities displayed much higher maximum gross production (GP max ), respiration, and light compensation point than separate phytoelements because of the multilayered structure and extensive self-shading in the communities, whereas light use efficiency at low irradiance (a) was the same. Although GP max and a varied extensively among the 190 communities, their upper limits increased linearly and predictably with community absorption reaching 26.3 mmol m 22 s 21 O 2 and 0.090 mol mol 21 photon at 100% absorption. The upper limit of a is close to a realistic limit of O 2 of 0.10 mol mol 21 photon. The upper limit of GP max , however, is markedly below the theoretically attainable 180 mol m 22 s 21 O 2 , reflecting a suboptimal three-dimensional structure and light distribution. Indirect measures supported this explanation as GP max increased fourfold from communities with a very uneven to a more even light distribution. Photosynthetic characteristics of communities are strongly influenced by plant density, absorption, and distribution of light and cannot be interpreted from the photosynthetic behavior of phytoelements. Thus, many examples of carbon and nutrient limitation in experiments with separate phytoelements may not withstand at the relevant ecological scale of communities where light almost always constrains photosynthetic production.

show abstract

Section: Discussionmentioning

confidence: 99%

Community photosynthesis of aquatic macrophytes

Binzer

Sand‐Jensen

Middelboe

2006

Limnology & Oceanography

105

View full text Add to dashboard Cite

show abstract

“…Mean ratios of net photosynthesis to dark respiration (P,,,,: R ) , useful indicators of plant productivity (Bowes & Salvucci 1989), generally ranged from 2 to 4 for H. wrightii, slightly lower than blade P,,,,:R ratios reported for Zostera marina (Zimmerman et al 1991). However, P,,,: R values for H. wrightii include the respiratory demands of below-ground tissue as well as leaves.…”

Section: Photosynthetic Performance In Halodule Wrightiimentioning

confidence: 96%

In situ photosynthesis in the seagrass Halodule wrightii in a hypersaline subtropical lagoon

Dunton¹,

Tomasko²

1994

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Photosynthesis versus irradiance ( P vs 1) parameters in the shoalgrass Halodule wrlghtii Ascherson were calculated from measurements of oxygen evolution collected in situ, using entire plants in Laguna Madre, Texas, USA. Eleven expenmental incubations were performed from May 1989 to April 1991 using pulsed oxygen electrodes that collected data continuously under natural daylight conditions For comparison with in situ measurements of photosynthesis, P v s 1 parameters were calculated from laboratory measurements on blade segments incubated In a small volume chamber. For field plants, average saturation 111-adiance (I,) was 319 pm01 m -2 S -' , photosynthetic capacity (P,,,) was 374 pm01 O2 g -l dry wt (dw) h -' , and relative quantum efficiency (a) generally ranged from 0.5 to 1.6 pm01 O2 g-I dw h -l (pm01 photons m -2 S-').'. Whole plant respration was 70 pm01 g ' dw (leaf) h ' , and compensation irradiance (I,,) was ca 85 pm01 m -2 S -' Chlorophyll a concentrations averaged 12.8 mg g -' dw. and the mean chl d:chl b ratio over the 2 yr period was 2 2 For blade segments incubated in the laboratory under similar temperatures to field plants and at corresponding chlorophyll concentrations. P,,, was not significantly different but a was signif~cantly higher, ranging from 3.4 to 5.3 pm01 O2 g -' dw h -' (~.lmol photons n r 2 S-').' The higher a values resulted In significantly lower estimates for 1, (mean of 101 pm01 m -2 S-'). The higher U in laboratory plants was largely related to the perpendicular orientation of leaf tissue to a directed hght field, which is not reflective of natural conditions for H. wrightii. The significant difference in 1, values calculated from incubations performed in the laboratory and field has profound effects on model calculations of H,,,, the duration of irradiancesaturated photosynthesis, and thus predictions of the minimum llght requirements required to sustain growth in H. wrightii. Consequently, the application of laboratory-derived 1, values for H. wrightii would result in overestimates of its maximum depth limlts and rates of area1 primary production

show abstract

“…Light is a crucial factor for submerged rooted macrophytes (Abernethy et al 1996;Bowes and Salvucci 1989;Goldsborough and Kemp 1988;Sabbatini and Murphy 1996) and its biotic and abiotic attenuation is responsible for morphological (shade-tolerance) and architectural (shade-avoidance) modifications of plants with the aim of enhancing the capture of radiation (Pilon and Santamaria 2002;Vári et al 2010;Wolfer et al 2006). Physiological acclimation to a given environment does not always follow this trend , although reports show successful acclimation to the light environment in other species (Maberly 1993;Spence and Chrystall 1970).…”

Section: Introductionmentioning

confidence: 99%

The effect of periphyton on the light environment and production of Potamogeton perfoliatus L. in the mesotrophic basin of Lake Balaton

Tóth

2013

Aquat Sci

View full text Add to dashboard Cite

Light within the littoral zone affects the productivity and interaction between periphyton and its macrophyte substrate. The effect of periphyton on macrophyte photosynthesis, seasonal variation and vertical distribution of periphyton on artificial substrates (plastic strips), and the effect of periphyton on the light environment was studied in Lake Balaton.Data showed that an average of 4.1±0.4 mg (dry weight) cm -2 of periphyton had accumulated on the plastic strips after 8.8±0.4 days. This biomass corresponded to 294±30 μg m -2 chl-a of epiphytic algae and blocked 92.3±0.8 % of the depth specific radiation.Seasonal variation and specific vertical distribution of periphyton were observed. The most active time of periphyton accumulation corresponded to spring up until mid-June. Later in the year, the amount of periphyton significantly decreased. The optimal conditions for periphyton accumulation were at 30-40 cm depth.Most of the light reaching the adaxial leaf surface was attenuated by periphyton, decreasing the production of Potamogeton perfoliatus by 60-80%. This increased the importance of backscattered light that corresponded to 10-15% of the macrophyte production.A smaller part of the periphyton consisted of precipitated inorganic material, while epiphytic algae, making up the majority of the periphyton, were connected to both benthic (dominantly 2 benthic penales) and pelagic (very close seasonal dynamics of pelagic and epiphytic biomass) algae. Periphyton affects macrophyte production especially in spring and in the upper water layers even in a mesotrophic water body. This increases the importance of the light absorbed through the abaxial side of the leaf and confirm the role of periphyton in transition from clear to turbid water states.

show abstract

Plasticity in the photosynthetic carbon metabolism of submersed aquatic macrophytes

Cited by 160 publications

References 102 publications

Community photosynthesis of aquatic macrophytes

Community photosynthesis of aquatic macrophytes

In situ photosynthesis in the seagrass Halodule wrightii in a hypersaline subtropical lagoon

The effect of periphyton on the light environment and production of Potamogeton perfoliatus L. in the mesotrophic basin of Lake Balaton

Contact Info

Product

Resources

About