Abstract
Intercropping systems are beneficial for resource utilization; however, the spatial proximity of companion species leads to competition for shared resources, particularly light. A walnut–potato intercropping model was established to understand the photosynthetic and physiological mechanisms underlying yield and marketability responses. Three intercropping treatments were established based on the number of potato ridges between walnut tree rows: B1 (three ridges), B2 (five ridges), and B3 (seven ridges). All intercropping and monoculture (CK) plots used an identical double-row planting pattern per ridge. Results showed that ridge density induced significant physiological changes and yield impacts. Compared to CK, B3 significantly reduced soluble protein content, net photosynthesis (Pn), and antioxidant enzyme activities (SOD, CAT), while B1 and B2 showed intermediate, non-significant reductions. Peroxidase (POD) activity increased progressively with ridge number (B3 > B2 > B1 > CK), indicating dose-dependent shade stress. Intercellular CO2 concentration (Ci) was significantly elevated under all intercropping treatments, suggesting a predominantly non-stomatal, biochemical limitation on photosynthesis rather than water stress. Yield was highest in CK, followed by B1 and B2—which were statistically comparable to CK—while B3 yielded the least due to severe shading. Marketability declined sharply in B3, with fewer than half of tubers reaching commercial grade. Multivariate analysis showed distinct clustering of yield-associated variables (Pn, protein, marketability) separate from shade-stress indicators (POD, Ci) across treatments. These findings provide practical and scientific evidence to optimize walnut–potato intercropping configurations under the arid conditions.
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Claims 9
Claim · model-written summary
B3 reduced potato soluble protein content, net photosynthesis and SOD/CAT antioxidant enzyme activity versus CK.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- B3e0
- Outcome
- soluble protein content, net photosynthesis (Pn), and antioxidant enzyme activities (SOD, CAT)e0
- Direction
- reducede0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to CK, B3 significantly reduced soluble protein content, net photosynthesis (Pn), and antioxidant enzyme activities (SOD, CAT)”
t0“walnut–potato”
Claim · model-written summary
B1 and B2 showed intermediate nonsignificant reductions in those physiological measures.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- B1 and B2e0
- Outcome
- soluble protein content, net photosynthesis (Pn), and antioxidant enzyme activities (SOD, CAT)e1
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B1 and B2 showed intermediate, non-significant reductions”
t0“walnut–potato”
e1“soluble protein content, net photosynthesis (Pn), and antioxidant enzyme activities (SOD, CAT)”
Claim · model-written summary
Potato POD activity rose progressively with ridge number.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- ridge numbere0
- Outcome
- Peroxidase (POD) activitye0
- Direction
- increasede0
- Comparator
- B3 > B2 > B1 > CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxidase (POD) activity increased progressively with ridge number (B3 > B2 > B1 > CK)”
t0“walnut–potato”
Claim · model-written summary
All intercropping treatments elevated potato intercellular CO2 concentration.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- all intercropping treatmentse0
- Outcome
- Intercellular CO2 concentration (Ci)e0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercellular CO2 concentration (Ci) was significantly elevated under all intercropping treatments”
t0“walnut–potato”
Claim · model-written summary
The elevated Ci suggested a predominantly non-stomatal biochemical limit on photosynthesis rather than water stress.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- limitation on photosynthesise0
- Qualifier
- non-stomatal, biochemicale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting a predominantly non-stomatal, biochemical limitation on photosynthesis rather than water stress”
t0“walnut–potato”
Claim · model-written summary
Yield ranked CK highest, B1 and B2 next, and B3 lowest under severe shading.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- B3e0
- Outcome
- Yielde0
- Direction
- the leaste0
- Qualifier
- due to severe shadinge0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield was highest in CK, followed by B1 and B2—which were statistically comparable to CK—while B3 yielded the least due to severe shading”
t0“walnut–potato”
Claim · model-written summary
B1 and B2 potato yields were statistically comparable to CK.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- B1 and B2e0
- Outcome
- Yielde1
- Direction
- statistically comparablee0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B1 and B2—which were statistically comparable to CK”
t0“walnut–potato”
e1“Yield was highest”
Claim · model-written summary
B3 sharply reduced potato marketability, with fewer than half of tubers at commercial grade.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- tuberse0
- Treatment
- B3e0
- Outcome
- Marketabilitye0
- Direction
- declinede0
- Value
- fewer than halfe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marketability declined sharply in B3, with fewer than half of tubers reaching commercial grade”
t0“walnut–potato”
Claim · model-written summary
Yield-associated variables clustered apart from shade-stress indicators across treatments.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- treatmentse0
- Outcome
- distinct clustering of yield-associated variables (Pn, protein, marketability) separate from shade-stress indicators (POD, Ci)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Multivariate analysis showed distinct clustering of yield-associated variables (Pn, protein, marketability) separate from shade-stress indicators (POD, Ci) across treatments”
t0“walnut–potato”