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法 ? 風(fēng)土馴化學(xué)說及馴化方法 代表人物為米丘林 ? 其他植物引種馴化理論和馴化方法 第二節(jié) 選擇育種 一、選擇育種的基本原理 (一)作物品種自然變異現(xiàn)象及其原因 ? 自然異交引起的基因重組 ? 自然變異(基因突變、芽變) ? 新育成品種群體中的變異(剩余遺傳變異 ) (二)純系學(xué)說( The theory of pureline selection) Wilhelm, L. Johannsen 1901 In selfpollinated crops Johannsen’s experiments Material: Highly selfpollinated crop Beans (Phaseolus vulgaris L.) mercial variety ‘Princess’ 16000 seeds 150 seeds 25 heaviest 100 average 25 lightest Johannsen’s experiments Seed size (cg)of sub lines within a pureline Seed size(cg)of progenies of sub lines Line 2 Line 3 line13 Line15 20 30 40 50 Effect of selection for seedsize groups (sublines with four pure lines) 1 2 6 7 13 18 19 20 41 30 40 45 50 60 70 average weight pure line weight of parents The weight of seven pure lines and their parents(cg) Harvest year Mean weight of parent seed(cg) Differen