Rice RBH1 Encoding A Pectate Lyase is Critical for Apical Panicle Development

Rice RBH1 Encoding A Pectate Lyase is Critical for Apical Panicle Development

Blog Article

Panicle morphology is one of the Benches main determinants of the rice yield.Panicle abortion, a typical panicle morphological defect results in yield reduction due to defective spikelet development.To further elucidate the molecular mechanism of panicle abortion in rice, a rice panicle bald head 1 (rbh1) mutant with transfer DNA (T-DNA) insertion showing severely aborted apical spikelets during panicle development was identified and characterized.The rbh1-1 mutant showed obviously altered cell morphology and structure in the degenerated spikelet.Molecular genetic studies revealed that RBH1 encodes a pectate lyase protein.

Pectate lyase-specific activity of Rice panicle Bald Head 1 (RBH1) protein assay using polygalacturonic acid (PGA) as substrates illustrated that the ORG RAW ALMONDS enzyme retained a significant capacity to degrade PGA.In addition, immunohistochemical analysis showed that the degradation of pectin is inhibited in the rbh1-1 mutant.Further analysis revealed that a significant increase in reactive oxygen species (ROS) level was found in degenerated rbh1-1 spikelets.Taken together, our findings suggest that RBH1 is required for the formation of panicle and for preventing panicle abortion.