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| Home > Publications database > The effect of irradiance on the carbon balance and tissue characteristics of five herbaceous species differing in shade-tolerance > print |
| 001 | 138965 | ||
| 005 | 20210129212420.0 | ||
| 024 | 7 | _ | |a 10.3389/fpls.2014.00012 |2 doi |
| 024 | 7 | _ | |a 2128/7815 |2 Handle |
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| 037 | _ | _ | |a FZJ-2013-05007 |
| 082 | _ | _ | |a 570 |
| 100 | 1 | _ | |a Pons, T. L. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a The effect of irradiance on the carbon balance and tissue characteristics of five herbaceous species differing in shade-tolerance |
| 260 | _ | _ | |a Lausanne |c 2014 |b Frontiers Media |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1403097890_30228 |2 PUB:(DE-HGF) |
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| 336 | 7 | _ | |a article |2 DRIVER |
| 520 | _ | _ | |a The carbon balance is defined here as the partitioning of daily whole-plant gross CO2 assimilation (A) in C available for growth and C required for respiration (R). A scales positively with growth irradiance and there is evidence for an irradiance dependence of R as well. Here we ask if R as a fraction of A is also irradiance dependent, whether there are systematic differences in C-balance between shade-tolerant and shade-intolerant species, and what the causes could be. Growth, gas exchange, chemical composition and leaf structure were analyzed for two shade-tolerant and three shade-intolerant herbaceous species that were hydroponically grown in a growth room at five irradiances from 20 μmol m−2 s−1 (1.2 mol m−2 day−1) to 500 μmol m−2 s−1 (30 mol m−2 day−1). Growth analysis showed little difference between species in unit leaf rate (dry mass increase per unit leaf area) at low irradiance, but lower rates for the shade-tolerant species at high irradiance, mainly as a result of their lower light-saturated rate of photosynthesis. This resulted in lower relative growth rates in these conditions. Daily whole-plant R scaled with A in a very tight manner, giving a remarkably constant R/A ratio of around 0.3 for all but the lowest irradiance. Although some shade-intolerant species showed tendencies toward a higher R/A and inefficiencies in terms of carbon and nitrogen investment in their leaves, no conclusive evidence was found for systematic differences in C-balance between the shade-tolerant and intolerant species at the lowest irradiance. Leaf tissue of the shade-tolerant species was characterized by high dry matter percentages, C-concentration and construction costs, which could be associated with a better defense in shade environments where leaf longevity matters. We conclude that shade-intolerant species have a competitive advantage at high irradiance due to superior potential growth rates, but that shade-tolerance is not necessarily associated with a better C-balance at low irradiance. Under those conditions tolerance to other stresses is probably more important for the performance of shade-tolerant species. |
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| 700 | 1 | _ | |a Poorter, Hendrik |0 P:(DE-Juel1)129384 |b 1 |u fzj |
| 773 | _ | _ | |a 10.3389/fpls.2014.00012 |0 PERI:(DE-600)2613694-6 |n 12 |p 1 - 14 |t Frontiers in plant science |v 5 |y 2014 |x 1664-462X |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/138965/files/FZJ-2013-05007.pdf |y OpenAccess |z Published final document. |
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