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首页> 美国卫生研究院文献>Biopreservation and Biobanking >Further Evidence That the Genebank Standards for Drying Orthodox Seeds May Not Be Optimal for Subsequent Seed Longevity
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Further Evidence That the Genebank Standards for Drying Orthodox Seeds May Not Be Optimal for Subsequent Seed Longevity

机译：进一步的证据表明对于随后的种子寿命而言干燥正统种子的种质库标准可能不是最佳选择

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Maximizing seed longevity is important for genebanks to efficiently manage their accessions, reducing the frequency of costly regeneration cycles and the loss of genetic integrity. Research on rice seeds has shown that subsequent longevity in air-dry storage can be improved by drying seeds, which are metabolically active at harvest (moisture contents above a critical value close to 16.5%), for an initial period at a higher temperature (40°C–60°C) than that currently recommended by the current genebank standards (5°C–20°C). The aim of this study was to test whether similar benefits could be achieved in two legume species—cowpea and soya bean—by drying freshly harvested seeds, from two separate harvests, at 40°C and 35% relative humidity, for up to 8 days before equilibrium drying in a drying room (17°C and 15% relative humidity). Improvements in longevity were observed in three of the four accessions of soya bean, with the greatest improvement generally occurring after the maximum duration (8 days) at the higher temperature. However, of the five accessions of cowpea, only seeds of TVu-9698 and TVu-13209 from the first harvest, and of TVu-13193 from the second harvest, showed an improvement in longevity compared with drying following the standard protocol. A negative effect of high-temperature drying was also observed in one accession of cowpea, TVu-11980, but only in seeds harvested later in the season, 13 weeks after planting. This research not only provides evidence of the potential benefits of drying orthodox seeds at an alternative, higher, temperature instead of at the conventional lower temperature, before long-term storage, but also raises awareness of how genebanks can improve the management of their accessions.
机译：最大化种子寿命对于种质库有效地管理其种质，减少昂贵的再生周期和遗传完整性的丧失至关重要。对稻米种子的研究表明，通过在高温下初始干燥种子，这些种子在收获时具有代谢活性（水分含量高于临界值，接近16.5％），可以提高风干存储的后续寿命（40）。 °C–60°C）比当前种质库标准当前建议的温度（5°C–20°C）高。这项研究的目的是测试通过在40°C和35％相对湿度下干燥两个独立收获的新鲜收获的种子长达8天，是否可以在两种豆科植物（w豆和大豆）中获得类似的收益在干燥室（17°C和15％相对湿度）中进行平衡干燥之前。在四份大豆中的三份中观察到了寿命的改善，最大的改善通常发生在高温下的最长持续时间（8天）之后。但是，在cow豆的五种保藏物中，只有第一次收获的TVu-9698和TVu-13209的种子，以及第二次收获的TVu-13193的种子，与按照标准规程干燥相比，寿命有所提高。在一种access豆TVu-11980中也观察到了高温干燥的负面影响，但仅在该季节后期（种植后13周）收获的种子中。这项研究不仅提供了证据，证明了在长期储存之前，在替代的，较高的温度下而不是在传统的低温下干燥正统种子的潜在益处，而且还提高了人们对种质库如何改善其种质管理的认识。

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