Details
| Original language | English |
|---|---|
| Pages (from-to) | 2419-2434 |
| Number of pages | 16 |
| Journal | Journal of experimental botany |
| Volume | 70 |
| Issue number | 9 |
| Early online date | 17 Aug 2018 |
| Publication status | Published - 15 Apr 2019 |
Abstract
Plants continually adjust the photosynthetic functions in their leaves to fluctuating light, thereby optimizing the use of photosynthetic nitrogen (Nph) at the canopy level. To investigate the complex interplay between external signals during the acclimation processes, a mechanistic model based on the concept of protein turnover (synthesis and degradation) was proposed and parameterized using cucumber grown under nine combinations of nitrogen and light in growth chambers. Integrating this dynamic model into a multi-layer canopy model provided accurate predictions of photosynthetic acclimation of greenhouse cucumber canopies grown under high and low nitrogen supply in combination with day-to-day fluctuations in light at two different levels. This allowed us to quantify the degree of optimality in canopy nitrogen use for maximizing canopy carbon assimilation, which was influenced by Nph distribution along canopy depth or Nph partitioning between functional pools. Our analyses suggest that Nph distribution is close to optimum and Nph reallocation is more important under low nitrogen. Nph partitioning is only optimal under a light level similar to the average light intensity during acclimation, meaning that day-to-day light fluctuations inevitably result in suboptimal Nph partitioning. Our results provide insights into photoacclimation and can be applied to crop model improvement.
Keywords
- Functional partitioning, Light, Mechanistic model, Nitrogen reallocation, Nitrogen supply, Optimal, Photosynthetic acclimation, Models, Theoretical, Photosynthesis/physiology, Plant Leaves/metabolism, Nitrogen/metabolism
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Physiology
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of experimental botany, Vol. 70, No. 9, 15.04.2019, p. 2419-2434.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Environmental triggers for photosynthetic protein turnover determine the optimal nitrogen distribution and partitioning in the canopy
AU - Pao, Yi Chen
AU - Chen, Tsu Wei
AU - Moualeu-Ngangue, Dany Pascal
AU - Stützel, Hartmut
N1 - Funding Information: This work was supported by Deutsche Forschungsgemeinschaft (DFG). We thank Ilona Napp, Marlies Lehmann, Adjoa Sekyi-Appiah, Sanzida Akhter Anee and Felliesia Regina Halim for their assistance during the experiments.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - Plants continually adjust the photosynthetic functions in their leaves to fluctuating light, thereby optimizing the use of photosynthetic nitrogen (Nph) at the canopy level. To investigate the complex interplay between external signals during the acclimation processes, a mechanistic model based on the concept of protein turnover (synthesis and degradation) was proposed and parameterized using cucumber grown under nine combinations of nitrogen and light in growth chambers. Integrating this dynamic model into a multi-layer canopy model provided accurate predictions of photosynthetic acclimation of greenhouse cucumber canopies grown under high and low nitrogen supply in combination with day-to-day fluctuations in light at two different levels. This allowed us to quantify the degree of optimality in canopy nitrogen use for maximizing canopy carbon assimilation, which was influenced by Nph distribution along canopy depth or Nph partitioning between functional pools. Our analyses suggest that Nph distribution is close to optimum and Nph reallocation is more important under low nitrogen. Nph partitioning is only optimal under a light level similar to the average light intensity during acclimation, meaning that day-to-day light fluctuations inevitably result in suboptimal Nph partitioning. Our results provide insights into photoacclimation and can be applied to crop model improvement.
AB - Plants continually adjust the photosynthetic functions in their leaves to fluctuating light, thereby optimizing the use of photosynthetic nitrogen (Nph) at the canopy level. To investigate the complex interplay between external signals during the acclimation processes, a mechanistic model based on the concept of protein turnover (synthesis and degradation) was proposed and parameterized using cucumber grown under nine combinations of nitrogen and light in growth chambers. Integrating this dynamic model into a multi-layer canopy model provided accurate predictions of photosynthetic acclimation of greenhouse cucumber canopies grown under high and low nitrogen supply in combination with day-to-day fluctuations in light at two different levels. This allowed us to quantify the degree of optimality in canopy nitrogen use for maximizing canopy carbon assimilation, which was influenced by Nph distribution along canopy depth or Nph partitioning between functional pools. Our analyses suggest that Nph distribution is close to optimum and Nph reallocation is more important under low nitrogen. Nph partitioning is only optimal under a light level similar to the average light intensity during acclimation, meaning that day-to-day light fluctuations inevitably result in suboptimal Nph partitioning. Our results provide insights into photoacclimation and can be applied to crop model improvement.
KW - Functional partitioning
KW - Light
KW - Mechanistic model
KW - Nitrogen reallocation
KW - Nitrogen supply
KW - Optimal
KW - Photosynthetic acclimation
KW - Models, Theoretical
KW - Photosynthesis/physiology
KW - Plant Leaves/metabolism
KW - Nitrogen/metabolism
UR - http://www.scopus.com/inward/record.url?scp=85063916986&partnerID=8YFLogxK
U2 - 10.1093/jxb/ery308
DO - 10.1093/jxb/ery308
M3 - Article
C2 - 30124935
AN - SCOPUS:85063916986
VL - 70
SP - 2419
EP - 2434
JO - Journal of experimental botany
JF - Journal of experimental botany
SN - 0022-0957
IS - 9
ER -