Abstract
【Objectives】Sugarcane( Saccharum officinarum L.) is an important sugar and energy crop with high biomass and high productivity. However,application of large amount chemical nitrogen fertilizer in sugarcane isvery common in China,which not only increases the production cost,but also causes environmental pollution. A possible method of reducing sugarcane nitrogen fertilization is inoculation of nitrogen fixation bacteria. The nitrogen fixing bacteria( NFB) strain Klebsiella sp. 120 was isolated from surface- sterilized roots of sugarcane cultivar ROC22. Its effect on photosynthetic characteristics and mineral nutrient accumulation in sugarcane was investigated.【Methods】Four sugarcane cultivars were planted in pots. The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage. Effects of the inoculation on photosynthetic characteristics and mineral nutrient accumulation of the four cultivars were studied after the treatment of 30 and 60 days,respectively.【Results】The results show that the photosynthetic rates and chlorophyll contents of different cultivars are affected differently by the inoculation with Klebsiella sp. 120. After 30 days inoculation increases signiticantly the chlorophyll contents in leaves of sugarcane cultivar ROC22( increased by 23%),slightly in the other three sugarcane cultivars B8,GT21 and GT28,compared to the uninoculated controls. The net photosynthetic rates of sugarcane cultivar ROC22 and B8 are higher than the controls after 30 days,and there are significant differences.The net photosynthetic rates of the four sugarcane cultivars inoculated the strain after 60 days are higher than those after 30 days. The net photosynthetic rates of the four sugarcane cultivars are significantly higher than controls after the treatment 60 days. The effects of inoculation on the net photosynthetic rates are better in the cultivars ROC22 and GT21. The effects of the inoculation treatments on the nutrient element contents are different. The contents of N in the NFB inoculation treatment group are all higher than control group for the four sugarcane cultivars,especially in cultivar ROC22( increased by 59. 8%). There are no differences in the contents of P and K in all the cultivars between the inoculation treatment group and the control group. Among the four cultivars,the Zn content in leaves of ROC22 and the Cu contents in leaves of ROC22 and B8 are improved significantly by inoculating,compared with the control. 【Conclusions 】 The effects of inoculating Klebsiella sp. 120 on the photosynthetic characteristics and mineral contents depend on sugarcane cultivars. The effect is most obvious in the sugarcane cultivar ROC22 among the selected four sugarcane cultivars. Therefore,experiment should be carried out for different sugarcane cultivars for the effective performance of the strain Klebsiella sp. 120.
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Claims 14
Claim · model-written summary
After 30 days, Klebsiella sp. 120 inoculation increased chlorophyll content in leaves of sugarcane cultivar ROC22 by 23% compared with uninoculated controls.
Verbatim
e0“After 30 days inoculation increases signiticantly the chlorophyll contents in leaves of sugarcane cultivar ROC22( increased by 23%)”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
e2“slightly in the other three sugarcane cultivars B8,GT21 and GT28,compared to the uninoculated controls”
Claim · model-written summary
After 30 days, Klebsiella sp. 120 inoculation slightly increased chlorophyll content in sugarcane cultivars B8, GT21 and GT28 compared with uninoculated controls.
Verbatim
e0“After 30 days inoculation increases signiticantly the chlorophyll contents in leaves of sugarcane cultivar ROC22( increased by 23%)”
e1“slightly in the other three sugarcane cultivars B8,GT21 and GT28,compared to the uninoculated controls”
e2“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
After 30 days, net photosynthetic rates of ROC22 and B8 were higher than controls with significant differences.
Verbatim
e0“The net photosynthetic rates of sugarcane cultivar ROC22 and B8 are higher than the controls after 30 days,and there are significant differences”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Net photosynthetic rates of four sugarcane cultivars after 60 days of inoculation were higher than after 30 days.
Verbatim
e0“The net photosynthetic rates of the four sugarcane cultivars inoculated the strain after 60 days are higher than those after 30 days”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
After 60 days, net photosynthetic rates of four sugarcane cultivars were significantly higher than controls.
Verbatim
e0“The net photosynthetic rates of the four sugarcane cultivars are significantly higher than controls after the treatment 60 days”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Inoculation effects on net photosynthetic rates were better in cultivars ROC22 and GT21.
- Taxon
- sugarcanee2
- Material
- ROC22 and GT21e0
- Treatment
- inoculated to the plants by root wateringe1
- Interactor
- Klebsiella sp. 120e1symbiont
- Outcome
- effects of inoculation on the net photosynthetic ratese0
- Direction
- bettere0
Not reportedComparator
Verbatim
e0“The effects of inoculation on the net photosynthetic rates are better in the cultivars ROC22 and GT21”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
e2“After 30 days inoculation increases signiticantly the chlorophyll contents in leaves of sugarcane cultivar ROC22( increased by 23%)”
Claim · model-written summary
Leaf nitrogen contents in the inoculated group were higher than in controls for all four sugarcane cultivars.
Verbatim
e0“The contents of N in the NFB inoculation treatment group are all higher than control group for the four sugarcane cultivars”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Nitrogen content of ROC22 increased by 59.8% with inoculation compared with the control group.
Verbatim
e0“especially in cultivar ROC22( increased by 59. 8%)”
e1“The contents of N in the NFB inoculation treatment group are all higher than control group for the four sugarcane cultivars”
e2“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Phosphorus and potassium contents showed no differences between inoculated and control groups in all cultivars.
Verbatim
e0“There are no differences in the contents of P and K in all the cultivars between the inoculation treatment group and the control group”
e1“The contents of N in the NFB inoculation treatment group are all higher than control group for the four sugarcane cultivars”
e2“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Leaf Zn content of ROC22 was significantly improved by inoculation compared with the control.
Verbatim
e0“the Zn content in leaves of ROC22 and the Cu contents in leaves of ROC22 and B8 are improved significantly by inoculating,compared with the control”
e1“The contents of N in the NFB inoculation treatment group are all higher than control group for the four sugarcane cultivars”
e2“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Leaf Cu content of ROC22 and B8 was significantly improved by inoculation compared with the control.
Verbatim
e0“the Zn content in leaves of ROC22 and the Cu contents in leaves of ROC22 and B8 are improved significantly by inoculating,compared with the control”
e1“The contents of N in the NFB inoculation treatment group are all higher than control group for the four sugarcane cultivars”
e2“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
The effect of inoculation is most obvious in sugarcane cultivar ROC22 among the four cultivars tested.
Verbatim
e0“The effect is most obvious in the sugarcane cultivar ROC22 among the selected four sugarcane cultivars”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Effects of Klebsiella sp. 120 inoculation on photosynthetic characteristics and mineral contents depend on sugarcane cultivar.
- Taxon
- sugarcanee0
- Material
- sugarcane cultivarse0
- Treatment
- inoculated to the plants by root wateringe1
- Interactor
- Klebsiella sp. 120e1symbiont
- Outcome
- effects of inoculating Klebsiella sp. 120 on the photosynthetic characteristics and mineral contentse0
Not reportedDirection
Verbatim
e0“The effects of inoculating Klebsiella sp. 120 on the photosynthetic characteristics and mineral contents depend on sugarcane cultivars”
e1“The strain Klebsiella sp. 120 was inoculated to the plants by root watering at the tillering stage”
Claim · model-written summary
Experiments with different sugarcane cultivars are recommended to confirm the effective performance of Klebsiella sp. 120.
Verbatim
e0“experiment should be carried out for different sugarcane cultivars for the effective performance of the strain Klebsiella sp. 120”
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