加锰处理对茶树锰含量及生理变化的影响研究

运用溶液培养方法对福鼎大白茶和槠叶齐茶树进行长期的加锰处理,探讨在锰胁迫条件下茶树对锰的吸收和累积及生理生化的影响。结果表明:长时期加锰处理,福鼎茶树会表现出锰胁迫。在处理初期(50d)和处理后期(176d),各加锰处理的福鼎和槠叶齐叶片锰含量随培养液锰浓度升高而增加的变化趋势一致,处理初期,槠叶齐各处理叶片中锰含量较福鼎高,而福鼎在处理中期(143d)时,除对照外,其他处理叶片锰含量均高于槠叶齐,平均增幅达3142.67mg/kg。在处理中期,部分锰处理的福鼎茶树叶片出现锰害症状,叶绿素含量急剧降低,嫩叶变黄,老叶变褐,其叶片中的超氧化物岐化酶(SOD)、过氧化物酶(POD)、多酚氧化酶(PPO)以及丙二醛(MDA)活性均反映了该时期加锰处理茶树处于胁迫状态,而槠叶齐较福鼎表现出较强的耐锰性,表明锰对茶树的胁迫与茶树品种有很大关系。

Effect of Mn Addition Treatment on Accumulation of Mn and Physiological Active Substance in Tea Plants

Hydroponic cultivation was used to study the effects of long-term treatment with different levels of Mn on accumulation of Mn and physiological active substance in two tea cultivars. The result indicated that Fuding cultivars shows stress phenomenon of Mn after long-term treated by Mn addition treatment. while that of Zhu yeqi cultivar is not. Mn concentration in tea leaves of Zhu yeqi cultivar is higher than that of Fuding during growing 50 days and 176 days respectively. Except the A treatment the Mn concentration in other treatment, the tea plant leaves of Fuding cultivar are higher than that of Zhu yeqi cultivar in 143 days. At the middle stage, some leaves of Fuding cultivar show the phenomenon of Mn stress, chlorophyll content in tea leaves decrease, young leaves become yellow, old leaves become brown. The change of Superoxide Dismutase (SOD), peroxidase (POD), polyphenoloxidase (PPO) and Maleic Dialdehyde (MDA) activity shows tea plants are in the situation of Mn stress. However, Zhu yeqi cultivar shows greater ability of anti-Mn stress than that of Fuding cultivar. This indicated that the ability of anti-Mn stress for tea pant showed relationship with tea plant cultivar.