不同糜子品种萌发期对干旱胁迫的响应及抗旱性评价

摘要

Related indicators to drought resistance were measured for 16 millet (Panicum miliaceum L. ) varieties at germination stage under simulated drought stress using polyethylence glycol (PEG)-6000 solution. Drought resistance was comprehensively evaluated with subordinative function at this stage to investigate the response of varieties to drought stress. Results showed significant drought resistance among 16 millet varieties. Seed germination speed and rate were decreased by restraining seed germination vigor under drought stress. The inhibitory effect of drought stress on radicle was stronger than on embryo. Therefore, germination drought resistance index, relative germination rate, relative germination energy, relative germ and radicle length, relative germination index and relative vigor index were able to be used as effective indicators for drought resistance identification at the germination stage of millet. Hequhong millet, Yihong millet and Nianfeng millet 5 having stronger drought resistance were tested.%利用PEG-6000溶液模拟干旱胁迫,对16个糜子(Panicum miliaceum L.)品种萌发期与抗旱性相关的指标进行测定,比较其抗旱性,并采用隶属函数法对其抗旱性进行综合评价.结果表明:不同糜子品种抗旱性有显著性差异.干旱胁迫抑制糜子种子萌发活力,降低了萌发速度和发芽率；干旱胁迫对糜子胚根的抑制要强于胚芽；萌发抗旱指数、相对发芽率、相对发芽势、相对胚芽长、相对胚根长、相对萌发指数和相对活力指数均可作为糜子萌发期抗旱性鉴定的参考指标.河曲红黍子、伊选红糜、粘丰5号这3个品种抗旱性较强.