Abstract
ABSTRACT Background Nitrogen (N) limitation may reduce the CO 2 ‐fertilization effect on photosynthesis and crop productivity. The mechanisms by which N supply influences photosynthetic capacity under elevated CO 2 (eCO 2 ) are not well understood, particularly in chickpea. Aims This study examined the interactive effects of CO 2 and N supply on chickpea's photosynthetic capacity and leaf N status, and to understand the regulatory role of N in photosynthetic capacity under eCO 2 . Methods Non‐inoculated chickpea plants were grown under two CO 2 levels (400 vs. 800 µmol mol −1 ) and two N rates (21 vs. 189 mg N kg −1 soil) for 65 days. Photosynthetic activity and plant N uptake were investigated at the flowering and podding stages of growth. Results Adequate N supply maintained the maximum Rubisco carboxylation capacity ( V c,max25 ) and the electron transport rate supporting ribulose–1,5‐bisphosphate (RuBP) regeneration ( J 25 ) under eCO 2 by increasing leaf N concentration per unit area and chlorophyll synthesis and reducing photosynthetic acclimation in chickpea under eCO 2 at the flowering and podding stages. Low N decreased the leaf N concentration and SPAD (soil and plant analyzer development of chlorophyll meter readings) and limited the eCO 2 ‐driven increases in V c,max25 and J 25 . High‐N supply increased plant biomass and N accumulation to a greater extent under eCO 2 than under ambient CO 2 , leading to significant CO 2 × N interactions. Conclusion Adequate N supply is critical to enhance photosynthetic capacity by maintaining V c,max25 and J 25 in non‐inoculated chickpea at the flowering and podding stages under eCO 2 . The findings highlight the importance of optimizing N management for maximizing the CO 2 ‐fertilization effect in future climate change.
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Claims 8
Claim · model-written summary
Adequate N supply maintained the maximum Rubisco carboxylation capacity (Vc,max25) of chickpea under elevated CO2.
- Taxon
- chickpea
Cicer arietinumt0 - Treatment
- Adequate N supplye1
- Outcome
- maximum Rubisco carboxylation capacitye1
- Direction
- maintainede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e1“Adequate N supply maintained the maximum Rubisco carboxylation capacity”
Claim · model-written summary
Adequate N supply maintained the electron transport rate supporting RuBP regeneration (J25) of chickpea under elevated CO2.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Adequate N supplye1
- Outcome
- electron transport ratee2
- Direction
- maintainede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e1“Adequate N supply maintained the maximum Rubisco carboxylation capacity”
e2“the electron transport rate supporting ribulose”
Claim · model-written summary
Adequate N supply enhances photosynthetic capacity of chickpea by increasing leaf N concentration per unit area and chlorophyll synthesis.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Adequate N supplye4
- Outcome
- photosynthetic capacitye4
- Qualifier
- by increasing leaf N concentration per unit area and chlorophyll synthesise3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e3“by increasing leaf N concentration per unit area and chlorophyll synthesis”
e4“Adequate N supply is critical to enhance photosynthetic capacity”
Claim · model-written summary
Low N decreased leaf N concentration and SPAD readings in chickpea.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Low Ne5
- Outcome
- leaf N concentration and SPADe5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e5“Low N decreased the leaf N concentration and SPAD”
Claim · model-written summary
Low N limited the elevated-CO2-driven increases in Vc,max25 and J25 of chickpea.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Low Ne5
- Outcome
- increasese6
- Direction
- limitede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e5“Low N decreased the leaf N concentration and SPAD”
e6“limited the eCO 2 ‐driven increases in V c,max25 and J 25”
Claim · model-written summary
High-N supply increased chickpea plant biomass and N accumulation to a greater extent under elevated CO2 than under ambient CO2.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- High‐N supplye1
- Outcome
- plant biomass and N accumulatione1
- Direction
- increasede1
- Qualifier
- to a greater extent under eCO 2e1
- Comparator
- ambient CO 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e1“High‐N supply increased plant biomass and N accumulation to a greater extent under eCO 2 than under ambient CO 2”
Claim · model-written summary
The CO2 × N interaction was significant for chickpea.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- N supplye1
- Outcome
- CO 2 × N interactionse2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e1“High‐N supply increased plant biomass and N accumulation to a greater extent under eCO 2 than under ambient CO 2”
e2“leading to significant CO 2 × N interactions”
Claim · model-written summary
Optimizing N management is recommended for maximizing the CO2-fertilization effect in chickpea under future climate change.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- optimizing N managemente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Capacity of Chickpea”
e1“optimizing N management for maximizing the CO”
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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.