Regulation of gene expression involved in the remobilization of rice straw carbon reserves results from moderate soil drying during grain filling

Guanqun Wang, Haoxuan Li, Kai Wang, Jianchang Yang, Meijuan Duan, Jianhua Zhang*, Nenghui Ye*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

30 Citations (Scopus)


Carbon reserves in rice straw before flowering contribute greatly to grain filling. Moderate soil drying imposed at the post-anthesis stage significantly promotes carbon reserve remobilization in straws of rice, but the regulation of this process at the proteomic and transcriptomic level remains poorly understood. In this study, we applied moderate soil drying (MD) to rice at the post-anthesis stage, which was followed by dynamic proteomic and transcriptomic studies using SWATH-MS and RNA-seq analysis. MD treatment upregulated the proteins alpha-glucosidase, beta-glucosidase and starch phosphorylase, which are responsible for starch degradation. Furthermore, MD treatment enhanced the expression of proteins involved in the sucrose synthesis pathway, including SPS8 and SPP1. In addition, various monosaccharide transporters (MSTs) and sucrose transporter 2 (SUT2), which are pivotal in carbon reserve remobilization, were also upregulated in straw by MD treatment. Differentially expressed transcription factors, including GRAS, TCP, trihelix, TALE, C3H, and NF-YC, were predicted to interact with other proteins to mediate carbon reserve remobilization in response to MD treatment. Further correlation analysis revealed that the abundances of most of the differentially expressed proteins were not correlated with the corresponding transcript levels, indicating that the carbon reserve remobilization process was probably regulated by posttranscriptional modification. Our results provide insights into the molecular mechanisms underlying the regulation of carbon reserve remobilization from straw to grain in rice under MD conditions.

Original languageEnglish
Pages (from-to)604-618
Number of pages15
JournalThe Plant Journal
Issue number3
Early online date17 Oct 2019
Publication statusPublished - Feb 2020

Scopus Subject Areas

  • Genetics
  • Plant Science
  • Cell Biology

User-Defined Keywords

  • grain filling
  • Oryza sativa
  • RNA sequencing
  • soil drying
  • straws
  • transporters


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