色木槭和拧筋槭种子脱水耐性分析——基于含水量、发芽率和ABA含量变化的结果

通过采集不同发育阶段种子并对其进行自然干燥处理,以含水量、发芽率和ABA含量变化为指标,研究了色木槭和拧筋槭种子在自然发育和干燥过程中的脱水耐性变化.结果表明,色木槭和拧筋槭种子虽经历了成熟脱水,但种子仍不耐脱水;其发芽率和活力指数随发育进程而逐渐增加,但随自然脱水进程而逐渐降低;色木槭和拧筋槭种子最大脱水耐性分别出现在花后100 d和120 d;在整个发育过程中,两树种种子的ABA(脱落酸)含量均较低;拧筋槭种子中ABA含量在脱水过程中呈下降趋势,而色木槭种子中ABA含量在脱水过程中虽有升高但变化不显著.推测ABA含量低可能为色木槭和拧筋槭种子不耐脱水的主要原因之一.

Desiccation Tolerance of Acer mono and A.triflorum Seeds based on Changes of Moisture Content, Germination Percentage and ABA Content

Desiccation tolerance of Acer mono and A.triflorum seeds was studied based on changes of moisture content,germination percentage and ABA content during development and air-drying of seeds in different developmental stages.The results showed that seeds of Acer mono and A.triflorum underwent mature desiccation,but they didn't obtain enough desiccation tolerance.The germination percentage and vigor index of seeds increased rapidly during the development but decreased gradually during air-drying.The strongest desiccation tolerance for A.mono and A.triflorum seeds displayed at 100 days and 120 days after anthesis respectively.During the whole development,the ABA(abscisic acid) content in seed remains a lower level for two tree species,and the ABA content in A.triflorum seeds declined during air-drying while in A.mono seeds it showed a slightly upward pattern.The results implicated that the low content of ABA in A.mono and A.triflorum seeds might be one of the main causes for their low desiccation tolerance.