NaCl胁迫对五彩石竹和常夏石竹种子萌发的影响

Effect of NaCl Stress on Seed Germination of Dianthus chinensi and Dianthus plumarius

以五彩石竹(Dianthus chinensis)和常夏石竹(Dianthus plumarius)种子为供试材料,在浓度为0.5%、1.0%、1.5%的NaCl单盐胁迫下进行发芽实验。结果表明:与对照相比,随着NaCl胁迫浓度的增加,两种石竹种子的发芽率、发芽值和发芽指数均呈降低趋势,随着胁迫浓度的增加相对盐害率升高,种子开始发芽的时间推迟,发芽过程延长;1.0%NaCl浓度胁迫对五彩石竹和常夏石竹发芽率的抑制分别达到了67.70%和73.40%,在浓度为1.5%的NaCl胁迫下两种供试植物的发芽率分别为16.00%和5.33%。在不同浓度盐胁迫的作用下,两种供试种子的胚根、胚芽、子叶的生长受到不同的抑制。五彩石竹1.0%浓度NaCl溶液与对照相比其对胚根、胚芽有明显的抑制作用,胚根从6.89mm下降到1.98mm,胚芽从4.76mm下降到0.26mm;常夏石竹在0.5%浓度下,胚根、胚芽的生长受到明显影响,与对照相比胚根长下降了45.83%,胚芽长下降了54.60%。耐NaCl胁迫能力为五彩石竹>常夏石竹。

Using Dianthus chinensis and Dianthus plumarius as materials ,we applied NaC1 at concentration of 0.5%, 1.0 %, 1.5 % for salt stress treatments. The results showed that compared with the control, germination percentage, germination index and germination value for both species declined with increased salinity. Relative rate to salt damage increased, germination time was delayed and germination process was prolonged under high salinity stress. Inhibition of 1.0 % NaCI stress on germination rate of Dianthus chinensis and Dianthus plumarius reached 67.7% and 73.4% re- spectively. At a concentration of 1.5 % salt stress, the germination rate of two test materials were respectively 16.00 % and 5.33%. At different concentrations under the effect of salt stress, radical length, embryo length and the growth of cotyledon had different degress of inhibition. At the concentration of 1.0% NaCI, radical and embryo of Dianthus chinensis were significantly inhibited compared with the control . Radical length from 6.89 mm down to 1.98 mm. Em- bryo length from 4.76 mm down to 0.26 mrn. At the concentration of 0.5% NaCl, radical length and embryo length of Dianthus plumarius were significantly affected, compared with the control. Radical length decreased by 54.83% and embryo length decreased by 54. 60%. Ability to resist salt stress of Dianthus chinensis was better than that of Dian- thus plumarius.