Abstract
SUMMARY Plants grown under low magnesium (Mg) soils are highly susceptible to encountering light intensities that exceed the capacity of photosynthesis ( A ), leading to a depression of photosynthetic efficiency and eventually to photooxidation (i.e., leaf chlorosis). Yet, it remains unclear which processes play a key role in limiting the photosynthetic energy utilization of Mg‐deficient leaves, and whether the plasticity of A in acclimation to irradiance could have cross‐talk with Mg, hence accelerating or mitigating the photodamage. We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions. Magnesium deficiency considerably decreased rapeseed growth and leaf A , to a greater extent under high than under low light, which is associated with higher level of superoxide anion radical and more severe leaf chlorosis. This difference was mainly attributable to a greater depression in dark reaction under high light, with a higher Rubisco fallover and a more limited mesophyll conductance to CO 2 ( g m ). Plants grown under high irradiance enhanced the content and activity of Rubisco and g m to optimally utilize more light energy absorbed. However, Mg deficiency could not fulfill the need to activate the higher level of Rubisco and Rubisco activase in leaves of high‐light‐grown plants, leading to lower Rubisco activation and carboxylation rate. Additionally, Mg‐deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO 2 diffusion conductance through cytosol. These caused a more severe decrease in within‐leaf CO 2 diffusion rate and substrate availability. Taken together, plant plasticity helps to improve photosynthetic energy utilization under high light but aggravates the photooxidative damage once the Mg nutrition becomes insufficient.
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Claims 15
Claim · model-written summary
Magnesium deficiency decreased rapeseed growth and leaf A, more under high than under low light.
Verbatim
e0“Magnesium deficiency considerably decreased rapeseed growth and leaf A , to a greater extent under high than under low light, which is associated with higher level of superoxide anion radical and more severe leaf chlorosis”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Magnesium deficiency was associated with a higher level of superoxide anion radical.
Verbatim
e0“Magnesium deficiency considerably decreased rapeseed growth and leaf A , to a greater extent under high than under low light, which is associated with higher level of superoxide anion radical and more severe leaf chlorosis”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Magnesium deficiency was associated with more severe leaf chlorosis.
Verbatim
e0“Magnesium deficiency considerably decreased rapeseed growth and leaf A , to a greater extent under high than under low light, which is associated with higher level of superoxide anion radical and more severe leaf chlorosis”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Under high light, Mg-deficient rapeseed leaves showed a greater depression in the dark reaction.
Verbatim
e2“This difference was mainly attributable to a greater depression in dark reaction under high light, with a higher Rubisco fallover and a more limited mesophyll conductance to CO 2 ( g m )”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Under high light, Mg-deficient rapeseed leaves had a higher Rubisco fallover.
Verbatim
e2“This difference was mainly attributable to a greater depression in dark reaction under high light, with a higher Rubisco fallover and a more limited mesophyll conductance to CO 2 ( g m )”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Under high light, Mg-deficient rapeseed leaves had a more limited mesophyll conductance to CO2.
Verbatim
e2“This difference was mainly attributable to a greater depression in dark reaction under high light, with a higher Rubisco fallover and a more limited mesophyll conductance to CO 2 ( g m )”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
High irradiance enhanced the content and activity of Rubisco and mesophyll conductance in rapeseed.
- Taxon
- rapeseede1
- Treatment
- high irradiancee3
- Outcome
- content and activity of Rubisco and g me3
- Direction
- enhancede3
Not reportedComparator
Verbatim
e3“Plants grown under high irradiance enhanced the content and activity of Rubisco and g m to optimally utilize more light energy absorbed”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Magnesium deficiency lowered Rubisco activation and carboxylation rate in high-light-grown rapeseed.
Verbatim
e4“However, Mg deficiency could not fulfill the need to activate the higher level of Rubisco and Rubisco activase in leaves of high‐light‐grown plants, leading to lower Rubisco activation and carboxylation rate”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Mg-deficient rapeseed leaves under high light had smaller intercellular airspaces.
Verbatim
e5“Additionally, Mg‐deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO 2 diffusion conductance through cytosol”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Mg-deficient rapeseed leaves under high light had a lower surface area of chloroplast exposed to intercellular airspaces.
Verbatim
e5“Additionally, Mg‐deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO 2 diffusion conductance through cytosol”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Mg-deficient rapeseed leaves under high light had lower CO2 diffusion conductance through cytosol.
Verbatim
e5“Additionally, Mg‐deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO 2 diffusion conductance through cytosol”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Mg-deficient rapeseed leaves under high light invested more carbon per leaf area.
Verbatim
e5“Additionally, Mg‐deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO 2 diffusion conductance through cytosol”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Mg-deficient rapeseed leaves under high light had a more severe decrease in within-leaf CO2 diffusion rate and substrate availability.
Verbatim
e6“These caused a more severe decrease in within‐leaf CO 2 diffusion rate and substrate availability”
e5“Additionally, Mg‐deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO 2 diffusion conductance through cytosol”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Plant plasticity aggravates photooxidative damage once Mg nutrition becomes insufficient.
Verbatim
e7“Taken together, plant plasticity helps to improve photosynthetic energy utilization under high light but aggravates the photooxidative damage once the Mg nutrition becomes insufficient”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
Claim · model-written summary
Plant plasticity improves photosynthetic energy utilization under high light.
Verbatim
e7“Taken together, plant plasticity helps to improve photosynthetic energy utilization under high light but aggravates the photooxidative damage once the Mg nutrition becomes insufficient”
e1“We investigated the light acclimation responses of rapeseed ( Brassica napus ) grown under low‐ and adequate‐Mg conditions”
The same questions in other papers
magnesium atom · growth · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- positive
light · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- negative
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.