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通过低温贮藏,可以极大地延长种子或种子批的寿命,已成为日益明了的事实。Roberts(1972)依据种子死亡的外部和内部原因,把寿命论说分为两类;内部因素:包括必需的代谢物的耗尽,大分子的变性作用和有毒代谢物的积累。外部因素包括:电离辐射和微生物、真菌的侵袭。种子老化的多数定量研究,都集中在生活力(发芽力)和活力的丧失两个方面。一、种子老化的理论 1.贮藏养分的麦竭:由于额外耗尽必需的被酶作用物。主要的储备养分(储藏碳水化合物,蛋白质和类脂化合物),作为一种呼吸作用的结果,可展示较少的额外丧失。无发芽力的种子检查,显示余留的储备养分是足够的。低水分含量(少于8%)的贮藏种子中,不
It has become increasingly clear that cryopreservation can greatly extend the longevity of seed or seed batches. Roberts (1972) divided life-life theory into two groups based on external and internal causes of seed death; internal factors include depletion of necessary metabolites, denaturation of macromolecules, and accumulation of toxic metabolites. External factors include: ionizing radiation and microorganisms, fungal attack. Most quantitative studies of seed aging are focused on two aspects: viability (germination) and loss of viability. First, the theory of seed aging 1. Storage of nutrients in the wheat waste: due to additional depletion of the required enzyme substrate. The main reserve nutrients (stored carbohydrates, proteins and lipid compounds) can show less additional loss as a result of respiration. Seedless germination tests show that the remaining reserve nutrients are sufficient. In low moisture content (less than 8%) of the stored seeds, no