Open AccessTranscriptome Analysis of Upland Rice in Response to PEG Stress during Seed Germination
Author(s) -
Junzhou Li
Publication year - 2019
Publication title -
international journal of agriculture and biology/international journal of agriculture and biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.271
H-Index - 39
eISSN - 1814-9596
pISSN - 1560-8530
DOI - 10.17957/ijab/15.1202
Subject(s) - kegg , germination , biology , transcriptome , abscisic acid , radicle , gene , gibberellic acid , botany , gene expression , genetics
Upland rice is an ecotype adapted to dry culture system. In this study, changes in germination characteristics and transcriptome of germinating seeds exposed to 15% polyethylene glycol (PEG) were investigated using upland rice genotype IRAT109. PEG reduced germination potential and inhibited growth of seed radicle and plumule. Under PEG stress, gibberellic acid (GA) content decreased and abscisic acid (ABA) content increased. Transcriptome analysis revealed that 1270 genes were differentially expressed between stressed and non-stressed seeds. Approximately, 56.46% of differentially expressed genes (DEGs) were up-regulated and 43.54% of DEGs were down-regulated under PEG stress. Gene Ontology (GO) analysis categorized 1149 DEGs into 52 functional groups and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis assigned 123 DEGs to 54 pathways. A large number of DEGs related to GA signal transduction, ABA biosynthesis and signal transduction, and defense response pathways were upregulated. Results indicated that genes related with GA signal transduction and ABA play important role in germination under drought stress. Findings of this study are highly useful to understand the molecular mechanism of germination and provide candidate genes for molecular breeding in dry direct-seeded rice. © 2019 Friends Science Publishers