Sample Set Information
	Title:  LC-MS based untargeted metabolome analysis of Oryza sativa (var. BG304)
	Description:  Compounds in various samples were analyzed using liquid chromatography-mass spectrometry (LC-MS). The same analytical conditions are applied to all samples.

Sample Information
	Organism - Scientific Name:  Oryza sativa (var. BG304)
	Organism - Common Name:  rice
	Planting location:  Harvested in yangzhou, Jiangsu
	Tissue:  seed

Sample Preparation Information
	Description:  After harvesting, the samples were immediately frozen in liquid nitrogen before stored at -80°C. The freeze-dried sample was ground to a fine powder using tissue grinder and stored at -80°C until use.

Analytical Method Information
	Instrument:  Q Exactive hybrid Q-Orbitrap-high resolution mass spectrometry (Q-Orbitrap-HRMS) (Thermo Fisher Scientific)
	Instrument type:  UPLC-ESI-Q-Orbitrap
	Ionization:  ESI
	Ion Mode:  negative
	Compound Extraction:
		In brief, the freeze-dried tissues were ground using a tissue grinder (catalog No. 05010997; Shanghai BiHeng Biotechnology Company Limited, Shanghai, China) for 2min at 55Hz. 150mg of powder was weighed and mixed with 1.5ml 70% aqueous methanol (containing 1mg/L capsaicin as the internal standard). The samples were vortexed every 10min for 3 times and extracted overnight at 4°C. Following centrifugation at 12000 g for 15min, all the supernatants were filtered using a 0.22μm filter and transferred to a liquid phase bottle for subsequent analysis.
	Liquid chromatography (LC)-mass spectrometry (MS) analysis:
		Samples were analyzed on a Waters Acquity Ultra Performance Liquid Chromatography system equipped with an ACQUITY UPLC BEH C18 column (1.7μm, 2.1 mm × 100 mm) coupled with Q Exactive hybrid Q-Orbitrap-high resolution mass spectrometry (Q-Orbitrap-HRMS) (Thermo Fisher Scientific).
		Solvent:  70% aqueous methanol
		Column:  ACQUITY UPLC BEH C18 column (1.7μm, 2.1 mm × 100 mm)
		Total separation time:  30min
		Mobile phase:  (A) water with 0.04% acetic acid and (B) acetonitrile with 0.04% acetic acid
		Gradient:  95:5 A/B at 0min,5:95 A/B at 20.0min, 5:95 A/B at 24.0min, 95:5 A/B at 24.1min, and 95:5 A/B at 30.0min.
		Flow rate:  0.25ml/min
		CollisionEnergy:  27.50(15eV,40eV)