模拟酸雨对茄科3种蔬菜种子萌发的影响

Effect of Simulated Acid Rain on Seed Germination of Three Solanaceous Vegetables

采用pH2.0、3.0、4.0、5.0的模拟酸雨和pH6.5的中性溶液(ck)处理番茄、茄子、辣椒3种蔬菜种子,研究酸雨胁迫强度对3种蔬菜种子萌发的影响。结果表明:从发芽率、发芽势、发芽指数3个萌发指标来看,番茄种子在pH2.0～3.0的强酸雨胁迫下,萌发受到轻微抑制;茄子种子在pH2.0～5.0的酸雨胁迫下,萌发一直受到抑制,尤其是在pH2.0的强酸雨胁迫时表现出萌发几乎完全受到抑制,而辣椒种子在酸雨胁迫下,萌发几乎没有受到抑制。3个萌发指标均随着酸雨pH值的减小而减少。pH2.0～5.0酸雨胁迫下,辣椒吸水值的变幅(13.75)(番茄(19.91)(茄子(20.58),同等酸雨胁迫强度下,根长抑制指数、蛋白质含量降幅、丙二醛增幅辣椒(番茄(茄子。这表明抗酸雨胁迫能力:辣椒>番茄>茄子。

Tomato, brinjaul and capsicum seeds were treated with simulated acid rain at pH 2. 0, 3.0, 4. 0, 5.0 and 6. 5 （ as ck） levels in order to research the effects of acid rain on their germination. According to the four germination indexes of germination percentage, germination energy, germination index and average germination percentage per day, the results showed the germination of tomato seeds was slightly inhibited at pH 2. 0 - 3.0 ; however, brinjaul seeds was greatly inhibited, especially at pH 2. 0 and they almost can＇ t germinate; capsicum seeds were not affected by the variational pH values, and germinated well. All four germination indexes reduced with pH decreased. Under the acid rain stress from pH 2. 0 to pH 5. 0, the amplitude difference of water absorbance value was capsicum （13.75） 〈 tomato （ 19. 91 ） 〈 brinjaul （20. 58）, under the same acid rain stress condition, the inhibition index of shoot length, decreasing amplitude difference of protein content and amplitude difference of MDA content was capsicum 〈 tomato 〈 brinjaul. The results indicated that the resistance ability to acid rain was capsicum 〉 tomato 〉 brinjaul.