国家牧草种质中期库豆科植物种子监测和扩繁时间的判定

以38种1 153份豆科植物种子为研究对象,测定了其在中期库储存4~7年后种子发芽率的变化状况,判断是否需要继续监测或直接扩繁。结果表明:5年后无需监测直接扩繁的种子有饭豆、柱花草、田菁、小豆和银合欢等5种(同一草种,发芽率降低超过20%的份数占总数的百分比小于5%且发芽率升高的份数占总数的百分比大于70%);无需监测无需扩繁的种子有白三叶、杂三叶、黄花苜蓿、黄芪、野大豆等9种(发芽率降低超过20%的份数占总数的百分比大于60%);需要监测的种子有紫花苜蓿、沙打旺、草木樨、岩黄芪、红豆草等24种(发芽率变化在以上2个范围之外,则需要继续监测)。

Determination of monitoring and propagating time of 38 leguminous species seeds in national crop genebank

The germination percentages of 38 species were tested after storing for 4 to 7 years in order to de-termine if the seeds need to be monitored or propagated comparing with the initial germination percentage.The results showed that after storing for 5 years 9 species including Trifolium repens ,Trifolium hybridum and Medicago falcata do not need to be monitored or propagated (the percentage of the seed patches with more than 20% of germination rate redution is more than 60%);5 species seeds including Lablab purpureus ,Stybsan-thes guianensis and Sesbania cannabina need to be propagated immediately (the percentage of the seed patches with less than 20% of germination rate reduction is more than 5% and the percentage of the seed patches with increased germination rate is more than 70%);And 24 species including Medicago sativa ,Astragalus adsurgens and Melilotus suaveolens need to be monitored sequentially.