Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ijms22041562
Keywords
rice; seed vigor; small auxin-up RNA; sugar pathway
Funding
- National Natural Science Foundation of China [31971995, 31901601, 31771889]
- Natural Science Foundation of Guangdong Province [2020A1515011053]
- Key-Area Research and Development Program of Guangdong Province [2018B020202012, 2020B020219004]
- Science Foundation of Huzhou [2018GZ07]
- South China Agricultural University
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The disruption of OsSAUR33 affects seed vigor in rice by modulating the mobilization of stored reserves during germination and interacting with sugar signaling pathway components. Certain elite haplotypes of OsSAUR33 were associated with higher seed vigor, particularly in indica accessions, providing valuable insights into enhancing seed quality in rice cultivation.
Seed vigor affects seed germination and seedling emergence, and therefore is an important agronomic trait in rice. Small auxin-up RNAs (SAURs) function in a range of developmental processes, but their role in seed vigor remains unclear. Here, we observed that disruption of OsSAUR33 resulted in reduced germination rates and low seed uniformity in early germination. Expression of OsSAUR33 was higher in mature grains and early germinating seeds. RNA-seq analysis revealed that OsSAUR33 modulated seed vigor by affecting the mobilization of stored reserves during germination. Disruption of OsSAUR33 increased the soluble sugar content in dry mature grains and seeds during early germination. OsSAUR33 interacted with the sucrose non-fermenting-1-related protein kinase OsSnRK1A, a regulator of the sugar signaling pathway, which influences the expression of sugar signaling-related genes during germination. Disruption of OsSAUR33 increased sugar-sensitive phenotypes in early germination, suggesting OsSAUR33 likely affects seed vigor through the sugar pathway. One elite haplotype of OsSAUR33 associated with higher seed vigor was identified mainly in indica accessions. This study provides insight into the effects of OsSAUR33 on seed vigor in rice.
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