2Tiburcio AF, Campos JL, Figueras X, et al. Recent advances in the understanding of polymine functions during plant development[J].Plant Growth Regulator, 1993, (12) : 330- 340.
8Jan K,Kazywanski Z. Changes in polyamine concentration and proteases activity in spring barley during increasing water stress[J].Acta Physiologica Plantarum, 1991,13:13-20.
9Jackson MB. Are plant homones involved in the root to shoot commnnication[J]. Adv Bot Res, 1993,85: 183-187.