土壤水分胁迫对槟榔幼苗叶片生理的影响

Effect of Different Moisture Treatments on Physiological Characteristics of Betelnut(Areca catechu) Seedling Leaves

以海南长蒂种槟榔幼苗为材料,采用盆栽试验,通过控制土壤含水量,研究不同水分胁迫对槟榔幼苗叶片的生理生化指标的影响规律。结果表明:经土壤水分胁迫处理后,槟榔幼苗叶片的丙二醛(MDA)含量、脯氨酸(Pro)含量、可溶性糖(SS)含量及可溶性蛋白含量均呈现上升趋势;过氧化物酶(POD)活性和超氧化物歧化酶(SOD)活性呈先升高后下降趋势,过氧化氢酶(CAT)活性则显示先降低而后升高趋势。并且,随着水分胁迫强度的增加及持续时间的延长,槟榔幼苗叶片的各项指标变化幅度差异较大。综合分析,初步认为:土壤相对含水量75%左右较有利于槟榔幼苗的生长。

Betelnut（Areca catechu） seedlings were pot cultured under different levels of water stress by controlling soil moisture content to determine their physiological characteristics through controlled irrigation. The results showed that the seedlings under water stress tended to increase their MDA content, proline content, soluble sugar content and protein in leaves, and raise first and then lower gradually their leaf POD and SOD activities, but lower first and then raise their leaf CAT activity. The physiological parameters of the leaves determined varied greatly with the increase of water stress and treatment duration, indicating different response mechanisms of the betelnut to water stress. Combining all the physiological parameters it is preliminarily believed that the betel nut seedlings grow better under the soil moisture maintaining at 75% of field capacity.