A novel tetrasaccharide, with a structure similar to the terminal sequence of an arabinogalactan-protein, accumulates in rice anthers in a stage-specific manner.
Analysis of free sugars in developing rice anthers by high-performance anion-exchange chromatography (HPAEC) showed that a very high concentration of a novel oligosaccharide accumulated specifically during microsporogenesis. Structural analysis of the purified oligosaccharide by methylation analysis, mass spectrometry/mass spectrometry (MS/MS), and nuclear magnetic resonance (NMR) spectroscopy revealed its structure to be beta-L- Ara(f)-(1-->3)-alpha-L-Ara(f)-(1-->3)-beta-D-Gal(p)-(1-->6)-D-Gal, which is closely related to a tetrasaccharide unit found in the glycan chain of a plant cell surface proteoglycan, the arabinogalactan-protein (AGP). Chilling treatment (12 degrees C, 4 days), which injures rice anthers during microsporogenesis, decreased the concentration of the tetrasaccharide, but the sucrose level increased. This effect was especially evident in a chilling-sensitive mutant line, YM56-1. These results suggest that this unique tetrasaccharide may play an important role in both the development of the rice anther and its response to chilling.
Kawaguchi
K
K
Laboratory of Crop Eco-Physiology, Hokkaido National Agricultural Experiment Station (HNAES), Ministry of Agriculture, Forestry and Fisheries (MAFF), Hokkaido, Japan.
Shibuya
N
N
Ishii
T
T
D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D003080:Cold Temperature; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009088:Mucoproteins / Q000737:chemistry*; D009844:Oligosaccharides / Q000096:biosynthesis* / Q000737:chemistry / Q000302:isolation & purification; D012275:Oryza / Q000378:metabolism / Q000502:physiology*; D010940:Plant Proteins / Q000737:chemistry; D013045:Species Specificity
D009088:Mucoproteins; D009844:Oligosaccharides; D010940:Plant Proteins; C006619:arabinogalactan proteins