Abstract
Necrotrophic fungus Rhizoctonia solani Kühn (R. solani) causes serious diseases in many crops worldwide, including rice and maize sheath blight (ShB). Crop resistance to the fungus is a quantitative trait and resistance mechanism remains largely unknown, severely hindering the progress on developing resistant varieties. In this study, we found that resistant variety YSBR1 has apparently stronger ability to suppress the expansion of R. solani than susceptible Lemont in both field and growth chamber conditions. Comparison of transcriptomic profiles shows that the photosynthetic system including chlorophyll biosynthesis is highly suppressed by R. solani in Lemont but weakly in YSBR1. YSBR1 shows higher chlorophyll content than that of Lemont, and inducing chlorophyll degradation by dark treatment significantly reduces its resistance. Furthermore, three rice mutants and one maize mutant that carry impaired chlorophyll biosynthesis all display enhanced susceptibility to R. solani. Overexpression of OsNYC3, a chlorophyll degradation gene apparently induced expression by R. solani infection, significantly enhanced ShB susceptibility in a high-yield ShB-susceptible variety '9522'. However, silencing its transcription apparently improves ShB resistance without compromising agronomic traits or yield in field tests. Interestingly, altering chlorophyll content does not affect rice resistance to blight and blast diseases, caused by biotrophic and hemi-biotrophic pathogens, respectively. Our study reveals that chlorophyll plays an important role in ShB resistance and suppressing chlorophyll degradation induced by R. solani infection apparently improves rice ShB resistance. This discovery provides a novel target for developing resistant crop to necrotrophic fungus R. solani.
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Claims 12
Claim · model-written summary
Resistant rice variety YSBR1 suppressed R. solani expansion more strongly than susceptible Lemont in field and chamber conditions.
- Taxon
- rice
Oryza sativat0 - Material
- YSBR1e0
- Interactor
- R. solani
Rhizoctonia solanie0pathogen - Outcome
- expansion of R. solanie0
- Direction
- strongere0
- Comparator
- Lemonte0
- Setting
- field and growth chamber conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resistant variety YSBR1 has apparently stronger ability to suppress the expansion of R. solani than susceptible Lemont in both field and growth chamber conditions”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
R. solani strongly suppressed the photosynthetic system including chlorophyll biosynthesis in Lemont but weakly in YSBR1.
- Taxon
- riceOryza sativat0
- Material
- Lemonte0
- Treatment
- R. solanie0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Outcome
- photosynthetic system including chlorophyll biosynthesise0
- Direction
- highly suppressede0
- Comparator
- YSBR1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic system including chlorophyll biosynthesis is highly suppressed by R. solani in Lemont but weakly in YSBR1”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
YSBR1 had higher chlorophyll content than Lemont.
- Taxon
- riceOryza sativat0
- Material
- YSBR1e0
- Outcome
- chlorophyll contente0
- Direction
- highere0
- Comparator
- Lemonte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“YSBR1 shows higher chlorophyll content than that of Lemont”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
Dark-induced chlorophyll degradation significantly reduced YSBR1 resistance.
- Taxon
- riceOryza sativat0
- Treatment
- dark treatmente0
- Outcome
- resistancee0
- Direction
- reducese0
Not reportedMaterialComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inducing chlorophyll degradation by dark treatment significantly reduces its resistance”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
Three rice mutants with impaired chlorophyll biosynthesis showed enhanced susceptibility to R. solani.
- Taxon
- riceOryza sativae0
- Material
- three rice mutantse0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Outcome
- susceptibility to R. solanie0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three rice mutants and one maize mutant that carry impaired chlorophyll biosynthesis all display enhanced susceptibility to R. solani”
Claim · model-written summary
One maize mutant with impaired chlorophyll biosynthesis showed enhanced susceptibility to R. solani.
- Material
- one maize mutante0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Outcome
- susceptibility to R. solanie0
- Direction
- enhancede0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three rice mutants and one maize mutant that carry impaired chlorophyll biosynthesis all display enhanced susceptibility to R. solani”
Claim · model-written summary
R. solani infection apparently induced OsNYC3 expression.
- Taxon
- riceOryza sativat0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Gene
- OsNYC3e0
- Outcome
- expressione0
- Direction
- inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsNYC3, a chlorophyll degradation gene apparently induced expression by R. solani infection”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
OsNYC3 overexpression significantly increased sheath blight susceptibility in variety 9522.
- Taxon
- riceOryza sativat0
- Material
- 9522e0
- Treatment
- Overexpression of OsNYC3e0
- Gene
- OsNYC3e0
- Outcome
- ShB susceptibilitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overexpression of OsNYC3, a chlorophyll degradation gene apparently induced expression by R. solani infection, significantly enhanced ShB susceptibility in a high-yield ShB-susceptible variety '9522'”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
OsNYC3 transcriptional silencing apparently improved sheath blight resistance.
- Taxon
- riceOryza sativat0
- Treatment
- silencing its transcriptione0
- Outcome
- ShB resistancee0
- Direction
- improvese0
- Setting
- field testse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“silencing its transcription apparently improves ShB resistance without compromising agronomic traits or yield in field tests”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
OsNYC3 transcriptional silencing did not compromise agronomic traits or yield in field tests.
- Taxon
- riceOryza sativat0
- Treatment
- silencing its transcriptione0
- Outcome
- agronomic traits or yielde0
- Direction
- without compromisinge0
- Setting
- field testse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“silencing its transcription apparently improves ShB resistance without compromising agronomic traits or yield in field tests”
t0“rice resistance to Rhizoctonia solani”
Claim · model-written summary
Changing chlorophyll content did not affect rice resistance to blight and blast diseases.
- Taxon
- riceOryza sativae0
- Treatment
- altering chlorophyll contente0
- Interactor
- biotrophic and hemi-biotrophic pathogense0pathogen
- Outcome
- rice resistance to blight and blast diseasese0
- Direction
- does not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“altering chlorophyll content does not affect rice resistance to blight and blast diseases, caused by biotrophic and hemi-biotrophic pathogens, respectively”
Claim · model-written summary
The authors infer that chlorophyll has an important role in sheath blight resistance.
- Taxon
- riceOryza sativat0
- Outcome
- ShB resistancee0
- Qualifier
- chlorophyll plays an important rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll plays an important role in ShB resistance”
t0“rice resistance to Rhizoctonia solani”
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