4种补血草属植物种子萌发期抗旱性研究

Study on Drought Resistance of Four Limonium Mill.in the Seed Germination Stage

为了研究4种补血草属植物种子之间的抗旱性差异及大小,为干旱荒漠区选择出抗旱性较强的补血草植物,笔者用不同浓度PEG-6000溶液模拟干旱胁迫条件,对二色补血草(Limonium bicolor)、大叶补血草(Limonium gmelinii)、耳叶补血草(Limonium otolepis)和乡土种黄花补血草(Limonium aureum)4种补血草种子的发芽率、发芽势、发芽指数、幼苗鲜重、活力指数进行了测定,并将处理7天后未萌发的种子移入蒸馏水中,测定了种子萌发恢复率。结果表明:在蒸馏水中,种子萌发率最高;随着PEG-6000溶液浓度的增加,种子的发芽率、发芽势、幼苗鲜重和发芽指数呈递减趋势。PEG-6000溶液处理后,未发芽的种子在复水后可恢复萌发。黄花补血草的抗旱耐性指数最大,其次依次为二色补血草、大叶补血草和耳叶补血草。结合发芽势、发芽率、幼苗长度、发芽速率、种子幼苗鲜重等指标分析表明,黄花补血抗旱性最强,二色补血草和大叶补血草居中,耳叶补血草最差。

In order to research the difference and the size of drought resistence of four Limonium L.,and choose Limonium L.of higher drought resistance for arid desert area.The seed germination rates,seedling fresh weights and vigor indexes and the germination recovery percentage of seeds that were incubated in PEG-6000 solutions for 7 days recovered after being transferred to distilled water of four species,Limonium bicolor,Limonium gmelinii,Limonium otolepis and Limonium aureum,were studied under droughty circumstances of different concentrations of PEG-6000.The reselt indicated that the germination rate,germination potential and germination index increased along with the reducing of PEG-6000 concentrations,which had inhibitory effect on the germination of seeds.The germination of seed can restore under PEG-6000 solution treatment.Drought resistance index of Limonium aureum was maximum,Limonium bicolor,Limonium gmelinii,Limonium otolepis being the second,the third,the fourth.The comprehensive evaluation of the seed germination rates,seedling fresh weights and vigor indexes of four species indicated that the drought resistances of the four species decreased in the order of Limonium aureumLimonium bicolorLimonium gmeliniiLimonium otolepis.