超干处理对蓝桉种子发芽及生理生化特性的影响

采用热空气恒温（50℃）干燥法对蓝桉种子进行超干处理，将蓝桉种子含水量由自然干燥的9．8％分别降至9％、8％、7％、6％、5％、4％、3％、2％、1％，研究超干燥处理对蓝桉种子发芽及生理生化特性的影响。结果表明:蓝桉种子耐脱水性较强，脱水至5％时，未发现种子活力明显下降，细胞膜能保持较好完整性，电导率最低，α—淀粉酶和脱氢酶活性高，各发芽能力指标在9个超干处理中最好。对各测定指标综合分析表明，蓝桉种子超干处理是完全可行的，最适含水率为5％，为蓝桉种子超干燥处理和贮藏提供了依据。

Effect of Ultra Dry Treatment on Germination and Physiological and Biochemical Characteristics of Eucalyptus globulus

The met hod of t he hot ai r constant te mperat ure （50℃）was used i n t hi s experi ment to carry onultra—dryi ng processi ng on t he seeds of Eucal yptus ．globulus ，t he mai n forest tree i n Sout h Chi na ．Thewater content of t he seeds of E ．lobulus was decreased fro m 9．8％by nat ural dryi ng to 9％，8％，7％，6％，5％，4％，3％，2％，1％separately to st udy t he effect of ultra—dryi ng processi ng on t he ger mi nati on and t he physi ologi cal characteri sti cs of t he seeds of E ．globulus ．The res ults i ndi cated t hat t he seeds of E ．globulus bore strong dehydrati on ．When dehydrated to 5％，t he cell me mbrane could mai ntai n a better integrity and t he acti veness of α—a mylase and dehydrogenase were up to t he hi ghest wit hout obvi ous drop of t he seed vi gor ．When t he seed water content was 5％，t he factors of ger mi nati ve capacity were t he best of all 9water content gradi ents i n ultra—dryi ng processi ng ．In bri ef ，t he ultra—dryi ng processi ng di d not affect the ger mi nati ve of t he seeds of E ．globulus si gnifi cantly and t he most s uitable water content was 5％．It was concluded t hat it was co mpletely feasi ble to process and store t he seeds of E ．globulus i n an ultra—drying environment．