A SUBTILISIN-LIKE SERINE PROTEASE1 (OsSUBSrP1), plays an important role in the wax and cutin pathway, is essential for panicle development in rice
Preprint
- 5 July 2021
- preprint
- research article
- Published by Cold Spring Harbor Laboratory
Abstract
Panicle degeneration is a severe physiological defect and causes reduction in grain yield. In this study, we characterized and presented the functional analysis of our previously reported mutant apa1331 (apical panicle abortion1331) that showed apical spikelet degeneration. The anthers from the apical spikelets of apa1331 were degenerated, pollen-less and showed lack of cuticle formation. Transverse sections showed normal meiosis till stage 5-6, however, defects in post-meiotic microspore development were found at stage 8-9 in apa1331. Measurement of wax and cutin analysis showed a significant reduction in anthers of apa1331 compared to Wildtype (WT). Quantification of H2O2 and MDA has indicated the excessive ROS (reactive oxygen species) in apa1331. Trypan blue staining, and TUNEL assay revealed cell death and excessive DNA fragmentation in apa1331. Map-based cloning and Mutmap analysis identified a candidate gene (LOC_Os04g40720) that is a SUBTILISIN-LIKE SERINE PROTEASE (OsSUBSrP1) which harbored an SNP (A>G) in apa1331. CRISPR-mediated knock-out lines of OsSUBSrP1 displayed spikelet degeneration comparable to apa1331. Global gene expression analysis revealed a significant downregulation of wax and cutin biosynthesis genes e.g., OsWDA1, OsMS2 and OsCER4 in apa1331. Our study reports the novel role of SUBSrP1 in ROS-mediated cell death in panicle development. Highlights 1. OsSUBSrP1 plays an important role in maintaining ROS-mediated programmed cell death. 2. OsSUBSrP1 is essential for apical spikelet development. 3. OsSUBSrP1 regulates the expression of wax and cutin biosynthesis pathway genes.Keywords
This publication has 68 references indexed in Scilit:
- Rice SDSFL1 plays a critical role in the regulation of plant structure through the control of different phytohormones and altered cell structureJournal of Plant Physiology, 2018
- An ABC transporter, OsABCG26, is required for anther cuticle and pollen exine formation and pollen-pistil interactions in ricePlant Science, 2016
- IRREGULAR POLLEN EXINE1 Is a Novel Factor in Anther Cuticle and Pollen Exine FormationPlant Physiology, 2016
- Rice TUTOU1 Encodes a Suppressor of cAMP Receptor-Like Protein That Is Important for Actin Organization and Panicle DevelopmentPlant Physiology, 2015
- Genome sequencing reveals agronomically important loci in rice using MutMapNature Biotechnology, 2012
- Male Sterile2 Encodes a Plastid-Localized Fatty Acyl Carrier Protein Reductase Required for Pollen Exine Development in ArabidopsisPlant Physiology, 2011
- The role of phytohormones ethylene and auxin in plant-nematode interactionsRussian Journal of Plant Physiology, 2009
- The SHINE Clade of AP2 Domain Transcription Factors Activates Wax Biosynthesis, Alters Cuticle Properties, and Confers Drought Tolerance when Overexpressed in Arabidopsis[W]THE PLANT CELL ONLINE, 2004
- Location and effects of long-term NaCl stress on superoxide dismutase and ascorbate peroxidase isoenzymes of pea (Pisum sativum cv. Puget) chloroplastsJournal of Experimental Botany, 2003
- The remarkable biology of pollen.THE PLANT CELL ONLINE, 1992