白木香种子脱水耐性的发育变化及贮藏特性

研究白木香种子发育进程中种子性状、萌发能力和脱水耐性的变化，以及不同光温条件对种子萌发的影响和种子的贮藏特性。结果表明：白木香种子在花后78d获得最大干重，进入生理成熟期，此时萌发率接近最大值；胚在花后57～85d，脱水耐性逐渐增强，并在花后85d获得最大脱水耐性。种子萌发的适宜温度范围为25℃-35℃，光照对种子萌发有一定的抑制作用。新鲜自木香种子（含水量27．45％）在4℃低温条件下贮藏1个月后萌发率仅为30％左右，而含水量7．38％的干燥种子在4℃低温条件下贮藏120d，萌发率仍有53．33％，因此，4℃低温和适度脱水有利于种子短期贮藏。白木香种子能忍耐一定程度的脱水，但干燥至含水量7．50％以下时种子会发生损伤，因此推测白木香种子是一种中间性种子。

Developmental Changes in Relation to Desiccation Tolerance and Storage Characteristics of Aquilaria sinensis (Thymelaeaceae) Seeds

The seed traits, germinability and desiccation tolerance at different developing periods of Aquilaria sinensis seeds were studied in the present paper, the seed storage characteristics and effects of light and temperature on seed germination were investigated too. The results indicated that A.sinensis seeds reached the physiological maturation and got the maximum dry-weight at 78d after anthesis, and seed germination percentage reached a peak at this period. Desiccation tolerance of embryos increased gradua...