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Author Liu N., Li J., Wang C.C., Yang T., Li A., Zeng P., Peng H., Zhang Y., Huang D., Zheng X., Zhang X.Q.
Title Extensin-like Protein OsPEX1 Modulates Grain Filling in Rice.
Abstract:
Grain filling is a vital factor influencing both rice grain yield and quality, yet its underlying mechanisms remain poorly understood. In this study, we perform a functional analysis of the grain-filling defective mutant <i>pex1</i> in rice. <i>pex1</i> plants produce seeds that are floury, thick-branched, and exhibit a significantly slower grain-filling rate compared to the wild type. Further analysis reveals that the <i>pex1</i> mutants accumulated more starch in the pericarp but exhibited a defect in starch accumulation in the endosperm during grain filling, indicating an impaired transport of photosynthetic products from the pericarp to the endosperm. Cells within the nucellar projection in the <i>pex1</i> mutant appear irregular and loose loosely arranged, consistent with defective transfer of assimilates. Expression analysis reveals a downregulation of key grain-filling genes during the filling phase in the <i>pex1</i> mutant compared to the wild type, which correlates with the reduced grain-filling rate. Subcellular localization suggests that OsPEX1 is associated with the endoplasmic reticulum. Our findings demonstrate that <i>OsPEX1</i> plays a crucial role in grain filling.
Journal Plants (Basel)
Country China
Volume 14(17)
Pages
Year 2025
PubMed ID 40941888
PubMed Central ID 12430520
DOI 10.3390/plants14172723
URL -
Relation
Gene AGPL2 AGPS1 AGPS2 ALK EXPA10 EXPA4 EXPB3 FLO11 FLO12 FLO13 FLO16 FLO23 FLO4 GBSSII GIF1 HAP3K NAC127 PEX1 PFPB PHO1 PHS8 SBE3 SSI SWEET15 TAR1 YUCCA9
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain 		-
Stages in Each Organ
- Muant Lines (Gene) 		-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase