Abstract
Silicon (Si) deficiency, caused by acidic soil and rainy climate, is a major constraint for sugarcane production in southern China. Si application generally improves sugarcane growth; however, there are few studies on the relationships between enhanced plant growth, changes in rhizosphere soil, and bacterial communities. A field experiment was conducted to measure sugarcane agronomic traits, plant nutrient contents, rhizosphere soil enzyme activities and chemical properties, and the rhizosphere bacterial community diversity and structure of three predominant sugarcane varieties under two Si treatments, i.e., 0 and 200 kg of silicon dioxide (SiO 2 ) ha −1 regarded as Si0 and Si200, respectively. Results showed that Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0, and had an obvious impact on rhizosphere soil pH, available Si (ASi), available P (AP), available K (AK), total phosphorus (TP), and the activity of acid phosphatase. Furthermore, the relative abundances of Proteobacteria showed a remarkable increase in Si200, which may be the dominant group in sugarcane growth under Si application. Interestingly, the AP was noticed as a major factor that caused bacterial community structure differences between the two Si treatments according to canonical correspondence analysis (CCA). In addition, the association network analysis indicated that Si application enriched the rhizosphere bacterial network, which could be beneficial to sugarcane growth. Overall, appropriate Si application, i.e., 200 kg SiO 2 ha −1 promoted sugarcane growth, changed rhizosphere soil enzyme activities and chemical properties, and bacterial community structures.
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Claims 7
Claim · model-written summary
Silicon application substantially improved sugarcane stalk fresh weight compared with Si0.
Verbatim
e1“Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0”
Claim · model-written summary
Silicon application substantially improved stalk Si, phosphorus and potassium contents of sugarcane compared with Si0.
Verbatim
e1“Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0”
Claim · model-written summary
Silicon application had an obvious impact on rhizosphere soil pH, available Si, and available P.
- Taxon
- sugarcanee1
- Organ / stage
- rhizosphere soile2
- Treatment
- Si applicatione1
- Outcome
- rhizosphere soil pH, available Si (ASi), available P (AP)e2
Not reportedComparatorDirection
Verbatim
e1“Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0”
e2“had an obvious impact on rhizosphere soil pH, available Si (ASi), available P (AP), available K (AK), total phosphorus (TP), and the activity of acid phosphatase”
Claim · model-written summary
Silicon application had an obvious impact on available K, total phosphorus and acid phosphatase activity in rhizosphere soil.
- Taxon
- sugarcanee1
- Organ / stage
- rhizosphere soile2
- Treatment
- Si applicatione1
- Outcome
- available K (AK), total phosphorus (TP), and the activity of acid phosphatasee2
Not reportedComparatorDirection
Verbatim
e1“Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0”
e2“had an obvious impact on rhizosphere soil pH, available Si (ASi), available P (AP), available K (AK), total phosphorus (TP), and the activity of acid phosphatase”
Claim · model-written summary
Si200 increased the relative abundance of Proteobacteria in the sugarcane rhizosphere.
- Taxon
- sugarcanee1
- Treatment
- Si200e3
- Interactor
- ProteobacteriaPseudomonadotae3other
- Outcome
- relative abundances of Proteobacteriae3
- Direction
- increasee3
Not reportedComparator
Verbatim
e1“Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0”
e3“the relative abundances of Proteobacteria showed a remarkable increase in Si200”
Claim · model-written summary
Available P was a major factor causing bacterial community structure differences between the two Si treatments.
- Taxon
- sugarcanee1
- Compound
- APe4
- Outcome
- bacterial community structure differences between the two Si treatmentse4
Not reportedDirection
Verbatim
e1“Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0”
e4“the AP was noticed as a major factor that caused bacterial community structure differences between the two Si treatments”
Claim · model-written summary
Silicon application enriched the sugarcane rhizosphere bacterial network.
Not reportedComparator
Verbatim
e5“the association network analysis indicated that Si application enriched the rhizosphere bacterial network, which could be beneficial to sugarcane growth”
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