1种子劣变的因素1.1种子特性1.1.1种皮结构种皮是物质进入种子的通道和屏障,空气、水分、细菌等都可能通过。如果种皮致密、坚韧、有蜡质的劣变就慢一些,反之,种皮薄、结构疏松、外无保护结构组织的种子劣变较快。种子在收获、加工、干燥、运输中,种皮一旦受到损伤,劣变就会发生,并受机械损伤的程度而加快。1.1.2化学成分种子主要由糖类、蛋白质、脂肪三类物质组成,脂 1 factors of seed deterioration 1.1 Seed characteristics 1.1.1 Seed coat structure Seed coat is the passage of material into the seeds and barriers, air, water, bacteria and so on are likely to pass. If the seed coat is dense, tough, waxy deterioration is slower, on the contrary, the seed coat is thin, the structure is loose, the seeds without protective structure outside will deteriorate rapidly. Seeds in the harvest, processing, drying, transportation, the seed coat once damaged, deterioration will happen, and the extent of mechanical damage and speed up. 1.1.2 chemical composition of the main seeds of sugar, protein, fat three components, fat