Abstract
Abstract Resistances of newly bred Bacillus thuringiensis ( Bt ) crops have been dramatically improved because of the effective and high expression of Bt protein in the plant. However, poorer adaptabilities to environmental stresses were observed in some Bt crops compared to their non‐ Bt counterparts. The biological reasons for the poorer adaptabilities were still unclear. A nitrogen (N) deficiency experiment was conducted to investigate variations in growth and physiology characteristics of a newly bred Bt rice [ Oryza sativa L. line MH63 ( Cry2A* )] compared to its non‐ Bt counterpart MH63. MH63 ( Cry2A* ) showed lower grain yields and lower biomass under low N levels compared to MH63. Earlier leaf senescence associated with disorder in protein metabolism was observed in MH63 ( Cry2A* ) when the N concentration was lower than 13.50 mg g −1 in MH63 ( Cry2A* ) leaves and the ratio of Bt protein to soluble protein (BT : SP) was higher than 2203 μg g −1 in MH63 ( Cry2A* ) leaves. The lower grain yield, the lower biomass and the earlier leaf senescence associated with disorder in protein metabolism in MH63 ( Cry2A* ) were correlated to the high BT : SP in MH63 ( Cry2A* ) leaves. The results suggest that MH63 ( Cry2A* ) has a poorer adaptability to N deficiency compared to its non‐ Bt counterpart MH63. This poorer adaptability might be related to the high Bt protein expression in MH63 ( Cry2A* ).
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Claims 6
Claim · model-written summary
MH63 ( Cry2A* ) had lower grain yield than MH63 under low nitrogen.
- Taxon
- rice
Oryza sativae1 - Material
- MH63 ( Cry2A* )e0
- Treatment
- low N levelse0
- Outcome
- grain yieldse0
- Direction
- lowere0
- Comparator
- MH63e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MH63 ( Cry2A* ) showed lower grain yields and lower biomass under low N levels compared to MH63”
e1“Bt rice”
Claim · model-written summary
MH63 ( Cry2A* ) had lower biomass than MH63 under low nitrogen.
- Taxon
- riceOryza sativae1
- Material
- MH63 ( Cry2A* )e0
- Treatment
- low N levelse0
- Outcome
- biomasse0
- Direction
- lowere0
- Comparator
- MH63e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MH63 ( Cry2A* ) showed lower grain yields and lower biomass under low N levels compared to MH63”
e1“Bt rice”
Claim · model-written summary
MH63 ( Cry2A* ) showed earlier leaf senescence with disordered protein metabolism below the stated leaf nitrogen threshold.
- Taxon
- riceOryza sativae1
- Material
- MH63 ( Cry2A* )e0
- Organ / stage
- leavese0
- Outcome
- leaf senescencee0
- Direction
- Earliere0
- Value
- 13.50 mg g −1e0
- Qualifier
- ratio of Bt protein to soluble protein (BT : SP) was higher than 2203 μg g −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Earlier leaf senescence associated with disorder in protein metabolism was observed in MH63 ( Cry2A* ) when the N concentration was lower than 13.50 mg g −1 in MH63 ( Cry2A* ) leaves and the ratio of Bt protein to soluble protein (BT : SP) was higher than 2203 μg g −1 in MH63 ( Cry2A* ) leaves”
e1“Bt rice”
Claim · model-written summary
Lower yield, biomass and earlier senescence correlated with high Bt to soluble protein ratio.
- Taxon
- riceOryza sativae1
- Material
- MH63 ( Cry2A* )e0
- Organ / stage
- leavese0
- Gene
- BT : SPe0
- Outcome
- lower grain yield, the lower biomass and the earlier leaf senescencee0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lower grain yield, the lower biomass and the earlier leaf senescence associated with disorder in protein metabolism in MH63 ( Cry2A* ) were correlated to the high BT : SP in MH63 ( Cry2A* ) leaves”
e1“Bt rice”
Claim · model-written summary
The authors conclude MH63 ( Cry2A* ) has poorer adaptability to nitrogen deficiency than MH63.
- Taxon
- riceOryza sativae1
- Material
- MH63 ( Cry2A* )e0
- Outcome
- adaptability to N deficiencye0
- Direction
- poorere0
- Comparator
- non‐ Bt counterpart MH63e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that MH63 ( Cry2A* ) has a poorer adaptability to N deficiency compared to its non‐ Bt counterpart MH63”
e1“Bt rice”
Claim · model-written summary
The authors suggest high Bt protein expression may relate to poorer adaptability.
- Taxon
- riceOryza sativae1
- Material
- MH63 ( Cry2A* )e0
- Gene
- Bt protein expressione0
- Outcome
- poorer adaptabilitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This poorer adaptability might be related to the high Bt protein expression in MH63 ( Cry2A* )”
e1“Bt rice”
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