有性雜交ppt課件-資料下載頁
2025-04-30 18:59本頁面
【正文】 vidual plant selectionEstablish families in progeny rows. Select individual plants to advance to each generation Preliminary yield trial with limited replications. Select individual plants to advance Replicated yield trialsF8 – F12 Cooperative tests at several locations, licensing, seed increase, cultivar releaseF2F3F4F6F5F72. 混合法（ bulkpopulation method） 這種方法又稱為混合 單株法，它是 前期進行混合選擇，最后進行一次單株選擇，適用于株行距小的自花授粉作物雜交后代的處理。Steps in bulk breeding methodP1 P 2 Space plant F1 to maximize seed increase and opportunity for rebinationGrow 5000 to 8000 plants in bulk at mercial seeding rate 5000 to 8000 plants in bulk obtained by sampling F2 plot at randomBulk plot with 5000 to 8000 plants obtained by sampling F2 plot at randomSpace plant 5000 to 8000 plants obtained by sampling F4 plot at random , and select about 200 to 300 individual plantsObserve families and select 20 to 30 plantsPreliminary yield test. Individuals advanced on performance. Advance 5 to 8 selectionsF8 – F12 Cooperative tests at several locations, eliminate all but one or two entries , licensing , seed increase , cultivar releaseF2F3F4F6F5F7F13. 單子傳代法 （ single seed descent） 單子傳代法為混合法的一種衍生選擇法，常簡寫成 SSD法。 該方法是從 F2開始每代都保持同樣規(guī)模的群體， 一般種植 200~400株。 從 F2開始每代從各單株取一粒種子播種下一代 （往往每株取 3粒，組成3份播種材料， 2份播種， 1份保留）， 每代不進行選擇，一直繁衍到遺傳性狀不再分離的世代為止 （F4至 F5代）， 再將每個單株種子分別采收 ，播種成200~400個株系， 進行株系間比較鑒定 ，一次選出符合育種目標的株系，升級鑒定。
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