不同种子预处理对10种沙拐枣植物萌发的影响

为了确定沙拐枣植物种子的萌发特性及最优播前预处理方法，在实验室条件下，对10种沙拐枣植物的种子进行了磨砺、硫酸和热水浸泡、冷藏、种子浸出液处理，然后进行发芽实验研究。萌发实验的结果表明，10种沙拐枣植物对于不同的种子预处理，均表现出相似的萌发反应。磨砺、硫酸浸泡和冷藏处理对种子萌发有明显地促进作用。与对照相比，种子浸出液处理对种子的发芽率、发芽速度均具有明显地抑制作用，并能增强种子的休眠。冷藏处理具有打破有活力的种子休眠、促进种子萌发的作用，但它与热水浸泡处理一样，对有活力种子表现出一定的致死作用。沙拐枣植物的萌发模式在不同种子预处理问均表现出明显的差异性。机械磨擦和硫酸处理能够促进种子的萌发率及发芽势。泡果沙拐枣(Callingonum junceum)在本项实验中表现出很强的萌发能力。

Effects of different seed pretreatments on germination of ten Calligonum species

In order to determine the optimum seed pre-sowing treatments and patterns of germination,a greenhouse experiment was conducted to study the effects of abrasion,sulphuric acid,boiling water,cold stratification and seed exudate treatments on the germination of ten Calligonum species.The results showed that the response of seed germination to the different pretreatments was similar for all ten Calligonum species.The abrasion,sulphuric acid and cold stratification treatments significantly promoted overall germinability.Compared with the control,the exudate treatment significantly decreased the percent germination,hampered the rate of germination and bolstered dormancy for almost all species.The cold stratification treatment can break the dormancy of viable Calligonum seeds and increased the germination,but it has a little lethal effect on viable seeds probably as well as the boiling water treatments.The germinaton patterns performed significant difference between the pre-sowing treatments for all ten Calligonum species,and the speed and percent germination of the Calligonum species can be greatly increased by mechanical scarification or sulphuric acid treatments.The results showed that seeds of C.junceum have strong ability of germinating.