不同浓度铅处理对大叶种普洱茶苗生理的影响

The Effect of Pb Treatments in Different Concentrations on the Physiological Characteristics of Large-leaf Pu'er Tea Seedling

为研究重金属铅胁迫对大叶种普洱茶苗生理特征的影响,以大叶种普洱茶苗为试验材料,采用盆栽法,研究不同浓度铅胁迫对大叶种普洱茶苗叶绿素含量及抗氧化酶活性的影响。试验结果显示,铅浓度在0~600 mg/L范围内,茶苗叶绿素含量先上升后下降;CAT、POD活性先升高后降低;而SOD活性随着铅浓度的增加含量均逐渐下降,MDA含量则随铅浓度增加而升高。试验结果表明,低浓度铅胁迫对大叶种普洱茶苗生长具有刺激作用,高浓度铅则对其产生抑制作用。

In order to elucidate the influence of lead on the physiological characteristics of large-leaf Pu ’er tea plant seeding, the author carried pot experiments by using large-leaf Pu’er tea seeding as test material to explore the effects of heavy metal lead stress on chlorophyll content and protective enzymes. The result showed that when lead concentration was 0-600 mg/L, chlorophyll content increased first and then decreased. The activities of CAT and POD went up at the beginning of lead stress, but they were decreased as the quantity of lead increasing. The activities of SOD showed the downtrend as the quantity of lead increasing, while the MDA content increased all the time. The result suggested that Pb stimulated the seeding growth of large-leaf Pu ’er tea at the lower concentrations, and restrained the seeding growth at higher concentrations.