Transcriptomic and proteomic profiles of II YOU 838 ( Oryza sativa ) provide insights into heat stress tolerance in hybrid rice

PeerJ

article

Yan Wang¹  Yang Yu¹  Min Huang²  Peng Gao²  Hao Chen²  Mianxue Liu²  Qian Chen²  Zhirong Yang¹  Qun Sun¹ 

[1] Key Laboratory of Bio-resource and Bio-environment of the Ministry of Education, College of Life Science, Sichuan University;Key Laboratory of Irradiation Preservation of Sichuan Province, Sichuan Institute of Atomic Energy

关键词: Hybrid rice;    Flag leaf;    Heat stress tolerance;    Transcriptome;    Proteome;    Co-regulatory network;   

DOI  :  10.7717/peerj.8306

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Heat stress is an increasing threat to rice production worldwide. To investigate the mechanisms of heat tolerance in hybrid rice and their contributions to rice heterosis, we compared the transcriptome of the hybrid rice II YOU 838 (II8) with the transcriptomes of its parents Fu Hui 838 (F8) and II-32A (II3) after heat stress at 42 °C for 0 h, 24 h, 72 h and 120 h. We also performed a proteomic analysis in II8 after heat stress at 42 °C for 24 h. The transcriptome data revealed time-dependent gene expression patterns under the heat stress conditions, and the heat stress response of II8 was greatly different from those of its parents. Gene ontology analysis of the differentially expressed genes that were clustered using k-means clustering showed that most of the up-regulated genes were involved in responses to stimuli, cell communication, and metabolic and transcription factor activities, whereas the down-regulated genes were enriched in photosynthesis and signal transduction. Moreover, 35 unique differentially abundant proteins, including a basic helix-loop-helix transcription factor (bHLH96), calmodulin-binding transcription activator, heat shock protein (Hsp70), and chaperonin 60 (CPN60), were detected in the proteomic analysis of II8 under heat stress. The co-regulatory analysis revealed novel genes and pathways involved in heat tolerance, namely, ferredoxin-NADP reductase, peroxidases, mitogen-activated protein kinase kinase kinase, and heat shock factor (HSF)–Hsp network. Members of the Hsp and HSF families had over-dominant expression patterns in the hybrid compared with its parents, to help maintain the higher photosynthesis and antioxidant defense systems in the hybrid. Our study suggests that the complex HSF–Hsp regulatory network contribute to the heat tolerance of the hybrid rice.

【 授权许可】

CC BY