脱落酸引发对夜香紫罗兰种子萌发的效应

研究脱落酸引发及其与植物生长调节剂的复合处理对夜香紫罗兰(Matthiolabicornis)种子萌发的效应.结果表明,将夜香紫罗兰种子于20℃下在2.5×10-5mol/L脱落酸(ABA)溶液中引发7 d,能显著缩短种子平均萌发时间,增加种子萌发指数.在ABA溶液中加入吲哚乙酸(NAA)未能进一步改善夜香紫罗兰种子萌发,但其他复合处理均显著提高正常幼苗百分率.ABA和细胞分裂素(KT)及NAA复合处理进一步增加种子萌发指数,不仅比单独用ABA引发的效果好,而且也比用聚乙二醇(PEG)引发的效果好.ABA引发和PEG引发的夜香紫罗兰种子相对吸水量显著不同.对ABA引发机理和应用潜力进行了讨论.

The Effects of ABA Priming on Germination of Matthiola bicornis Seeds

The effects of ABA priming, both alone and in combination with GA3, KT and NAA on germination of Matthiola bicornis seeds were investigated. The best priming was to treat seeds in 2.5×10-5 mol/L ABA solution at 20℃ for 7 d. This treatment significantly reduced mean germination time and increased germination index compared with the control. Combined treatment by ABA with NAA showed no further effect on germination of the seeds, but all the other combined treatments significantly increased the percentage of normal seedlings. The treatment in combination with KT and NAA increased the germination index compared to the treatment with ABA or PEG priming alone. There were quite differences in the seed relative water absorption between treatments with PEG and ABA priming. The potential and the mechanisms for using ABA priming to improve seed germination are discussed.