叶面喷施水杨酸对红掌植株抗寒性的影响

将红掌植株经0,100,200,300,400和500 mg·L-1水杨酸(salicylic acid, SA)常温25℃ 预处理1 d后再经6 ℃低温胁迫2 d后测定其相对电导率, 结果表明,当SA浓度为300 mg·L-1时 ,相对电导率比对照下降了20.38% , 抗寒效果显著。 测定此浓度下SA对红掌叶片相对电导率、丙二醛(MDA)含量、脯氨酸(Pro)含量、过氧化氢酶(CAT)、过氧化物酶(POD)和超氧化物歧化酶(SOD)活性的影响,结果表明,SA处理可降低红掌叶片在低温胁迫下的相对电导率和MDA含量,增强Pro的累积量,提高SOD和CAT的活性,增加POD活性的稳定性,表明SA处理可以提高红掌叶片的抗氧化酶活性和脯氨酸含量,降低膜脂过氧化反应,减少细胞膜的伤害程度,从而提高红掌植株的抗寒性。

Effect of spraying salicylic acid on chilling resistance of Anthurium

Anthurium plants were sprayed with 0, 100, 200, 300, 400 and 500 mg·L-1 salicylic acid(SA) separately under 25℃ for 1 d, then plants were treated under 6 ℃ for 2 d, and the relative electric conductivity (REC) were determined. The results indicated that REC decreased 20.38% in plants sprayed with 300 mg·L-1 SA compared with controls, and the effect on cold resistance were significant. Plants treated with 300 mg·L-1 SA under 25℃ for 1 d and then 6 ℃ for 2 d were used for the later experiments. The effects of low temperature on REC, malondialdehyde (MDA) and proline content, and activities of catalase (CAT), peroxidases (POD) and superoxide dismutase (SOD) were determined. The results showed that SA treatment could decrease REC and MDA content, enhance the accumulation of proline, increase the activities of SOD and CAT, and improve the stability of POD activities. SA treatment could increase the activities of antioxidant enzymes and the content of proline, decrease the reaction of membrane lipid peroxidation and the degree of membrane damage, and enhance the ability of chilling resistance in Anthurium plants．