聚乙二醇模拟干旱对三种木麻黄种子萌发的影响  

Effect of polyethylene glycol simulated drought stress on seed germination of three species of Casuarinaceae

作　　者：武冲[1] 仲崇禄[1] 张勇[1] 姜清彬[1] 

机构地区：[1]中国林科院热带林业研究所,广东广州510520

出　　处：《中南林业科技大学学报》2011年第2期22-26,共5页Journal of Central South University of Forestry & Technology

基　　金："十一五"林业科技支撑计划"优质抗逆生态树种木麻黄新品种选育"(06BADOIA1605);国林科院热带林业研究所基本科研业务专项资金"木麻黄杂交育种技术的研"(2007-24)

摘　　要：为研究木麻黄Casuarinaceae.种子苗困难地造林,以木麻黄为试验材料,用不同渗透势浓度的聚乙二醇(PEG-6000)模拟干旱胁迫,探讨干旱胁迫对木麻黄种子发芽率、发芽势、胚轴和胚根长度及发芽指数、活力指数的影响。结果表明,不同浓度PEG胁迫处理均降低了种子的发芽率,延缓了木麻黄种子萌发进程;种子的发芽率、发芽指数和活力指数均随胁迫强度的增加呈明显下降趋势。当-1.20 MPa的PEG胁迫处理的种子在试验结束时仍未能萌发,表明-1.20 MPa是木麻黄种子萌发的临界水势。当PEG浓度为150 g/L时,三种木麻黄幼苗的胚根最长,且当PEG浓度为100 g/L时,三种木麻黄胚根长度长于对照组,但差异不显著,说明高于-0.40 MPa的水势有利于木麻黄种子胚根的生长。木麻黄幼苗苗高生长则是随着PEG浓度的升高而逐渐减缓。通过比较得知木麻黄种子抗旱性较强。By taking the seeds of species Casuarinaceae as the test material, and through simulating drought stress with different concentrations and osmotic potential of polyethylene glycol（PEG-6000）, the effects of the drought stress on germination rate, germinating potential, radicles and hypocotyls length, germination index and viability index were investigated. The results show that PEG retarded the proceeding of seeds germination of Casuarinace- ae. and the germination percentage, germination index, and seed viability index were all showed the downtrend obviously with increasing concentration of PEG; The seeds treated with 1.20 MPa water potential of PEG did not germinate at all after the experiment finished, so this indicated - 1.20 MPa water potential was the threshold for the germination of Casuarinaceae. seeds; The seeds treated with 150 g/L PEG（about -0.20 MPa water potential）, the radicle lengths of three Casuarinaceae seedlings were the longest of the organs, and when the PEG concentration was 100 g/L, the three kinds of Casuarinaceae radicles were longer than the control group, but the differences were not significant. The findings reveal that the water potential higher than-0.40 MPa was beneficial to the growth of the radiclea of Casuarinaceae seeds; the growth of Casuarinaceae seedlings decreased with arising PEG concentrations. Compared with other plants, Casuarinaceae seeds had better drought resistance.

关 键 词：木麻黄 聚乙二醇(PEG 6000) 干旱胁迫 种子萌发 

分 类 号：Q949[生物学—植物学] S603.4[农业科学—园艺学]