磷酸二氢钾对香蕉幼苗抗冷性的影响

Effects of KH2PO4 on the cold resistance of banana seedlings

以香蕉主要栽培品种巴西蕉的幼苗为试材,研究了不同浓度的磷酸二氢钾对提高蕉苗抗冷性的影响。结果表明,在低温胁迫下,香蕉幼苗叶面喷施不同浓度的磷酸二氢钾均能显著降低香蕉幼苗叶片相对电导率和丙二醛(MDA)含量,维持较低的膜透性,提高蕉苗叶片可溶性蛋白、游离脯氨酸和叶绿素含量及提高超氧化物歧化酶(SOD)、过氧化物酶(POD)的活性,从而提高了香蕉幼苗的抗低温胁迫能力,在本试验设置的4个浓度处理中以磷酸二氢钾15 mmol/L处理的效果最佳。

Effects of different concentrations of KH2PO4 on the cold resistance of Musa AAA Giant Cavendish cv Baxi seedlings were studied. The results showed that KH2PO4 treatment could significantly decrease the relative conductivity and MDA content, and maintain lower levels of membrane permeability under cold stress, and increase the contents of soluble protein, proline and chlorophyll, and increase activity of SOD and POD. Therefore the cold resistance of the banana seedlings was enhanced. And among the 4 KH2PO4 concentrations in this experiment, 15 mmol/L was the best.