作物学报 ›› 2009, Vol. 35 ›› Issue (2): 191-202.doi: 10.3724/SP.J.1006.2009.00191
• 作物遗传育种·种质资源·分子遗传学 • 下一篇
张军12,赵团结1,盖钧镒1*
ZHANG Jun12,ZHAO Tuan-Jie1,GAI Jun-YI1*
摘要:
以往研究育成品种间的遗传关系只能通过系谱追踪进行一般性分析, 分子标记的发掘则提供了在位点及其等位变异基础上分析育成品种间遗传关系的手段。本研究在黄淮和南方190份大豆育成品种的85个SSR标记与农艺性状关联分析基础上, 将其中163份品种按系谱祖先归为58-161、徐豆1号、齐黄1号、南农493-1、南农1138-2五个家族, 对产量和品质性状进行优异等位变异在系谱中传承情况的分析。所涉及的最佳位点, 产量9个、百粒重3个、蛋白质含量2个、脂肪含量4个, 总解释率分别为91%、36%、13%和31%。每位点考查2个最优等位变异, 家族系谱祖先具有各自的优异等位变异, 随着育种轮次的增加在后育成品种中有丢失; 在系谱祖先基础上新品种衍生过程中吸纳其他亲本, 5个家族趋向共有大部分优异等位变异, 但频率分布不同。5个家族的品种所含有产量最多优异等位变异数未达饱和, 9个位点中最高含7个优异等位变异, 平均每个品种2.23个, 产量有进一步改良潜力。供试条件下高产品种平均产量是低产的2.36倍, 平均优异等位变异数是低产的4.17倍, 高、低产品种优异等位变异构成差异明显, 但高产品种间优异等位变异构成并不相同。也有的品种高产而优异等位变异数并不多, 有的品种优异等位变异较多但产量并不高。大豆育种不断从不同亲本中累积目标性状优异等位变异, 同时有些也在丢失, 应重视保存过时品种的优异等位变异, 以备后用。
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