为探究粳稻品种的耐盐性,以宁夏广泛种植的13个粳稻品种种子为材料,研究了不同浓度盐胁迫(0、50、100、150、200和250 mmol/L)对水稻种子萌发和幼苗生长的影响,筛选出适合在盐渍土壤种植的粳稻品种.结果表明,盐胁迫会抑制粳稻种子的萌发,并且随着盐浓度的提高抑制作用逐渐增强,种子发芽率、芽长、主根长和根数随盐浓度升高总体呈下降趋势,但较低盐浓度(50、100 mmol/L)时的下降不明显,部分品种还高于对照;高浓度盐溶液(250 mmol/L)抑制作用显著,种子的发芽率、芽长、主根长和根数显著下降,降幅分别为44.8%、86.2%、86.6%和83.8%;此外,以相对盐害率作为水稻发芽期耐盐性的评价指标,筛选出发芽期强耐盐品种京宁7号、宁粳28号(1级),宁粳43号、宁粳45号、宁粳48号和宁粳41号(3级).%In order to explore the salt resistance of japonica rice varieties,a field experiment was carried out to study the effects of salt stress with different concentrations (0,50,100,150,200,250 mmol/L)on seed germination and seeding growth of thirteen japonica rice varieties that widely planted in Ningxia, and screen the japonica rice varieties suitable for growing in saline soils. The results showed that the germination of rice seeds was inhibited by salt stress, and the inhibiting effect was enhanced with the increaseing of salt concentration.The germination rate,bud length,main-root length,number of roots were decreased with the increasing of salt con-centration. The germination rate was obviously inhibited by high concentration of salt solution (250 mmol/L), and the germination rate, bud length, main-root length, number of roots were decreased by 44.8%, 86.2%, 86.6% and 83.8%, respectively. However, the four characters didn't show obvious decrease under lower salt concentration (50,100 mmol/L),and inversely they were increased in some combinations. Moreover, salt tolerance of these combinations was evaluated by the relative damage rate. Finally, Jingning 7, Ninggeng 28,Ninggeng 43,Ninggeng 45,Ninggeng 48 and Ninggeng 41 were screened out as salt tolerance rice.
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