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Understanding Rice Responses to the Combination of Bacterial Panicle Blight and High Night Temperatures
Sapana Ghimire1, Shilu Dahal1, Chia-Sin Liew2
1Department of Plant Pathology, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA.
High night temperatures exacerbate Bacterial Panicle Blight (BPB) in rice. This study identified 146 candidate genes involved in rice defense against combined BPB and high temperature stress, crucial for developing resilient varieties.
Area of Science:
- Plant Pathology
- Molecular Biology
- Genetics
Background:
- Bacterial Panicle Blight (BPB), caused by *Burkholderia glumae*, significantly impacts global rice production.
- Increased prevalence of BPB correlates with high night temperatures (HNT), suggesting future challenges with climate change.
Purpose of the Study:
- To investigate the interplay between BPB and HNT in rice.
- To identify genetic factors underlying differential rice responses to combined stresses.
Main Methods:
- Phenotypic evaluation of 20 rice accessions under normal and high night temperatures post-*B. glumae* inoculation.
- Comparative transcriptomics and weighted gene co-expression network analysis on selected rice accessions.
- Functional characterization of differentially expressed genes (DEGs).
Main Results:
- Rice accessions exhibited varied responses to BPB under HNT, from increased susceptibility to moderate resistance.
- Comparative transcriptomics identified 6346 DEGs, with 146 genes linked to biotic/abiotic stress responses.
- Identified genes involved in proteolysis, defense signaling, transcription factors, secondary metabolism, and hormone regulation showed consistent expression patterns under single and combined stresses.
Conclusions:
- Rice response to BPB under HNT is complex, involving both temperature-dependent and independent genetic mechanisms.
- This study uncovers candidate genes crucial for developing rice varieties resilient to combined BPB and HNT stresses.
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