镉胁迫对蒙山茶树生长及叶片生理指标的影响

Effects of Cadmium Stress on Growth of Tea Plant and Physiological Index in Leaves of Mengshan Tea

通过盆栽试验,研究不同镉浓度对蒙山茶树生长及叶片生理特性的影响。结果表明:低浓度镉对茶树无明显毒害作用,当镉浓度达到60 mg/kg时,茶树植株受毒害基本死亡;春茶叶绿素含量加镉处理大多高于对照,其增加量先高后低;夏茶叶绿素总量随镉浓度的增加极显著降低,叶绿素含量与添加镉的量呈显著负相关,其相关系数r=-0.997;春茶、夏茶的丙二醛(Malondialdehyde,MDA)含量随镉处理浓度增加显著增加,其正相关系数分别为r=0.970,r=0.994(P<0.01);春茶游离脯氨酸含量随添加镉浓度的增加显著增加,相关系数r=0.829(P<0.05),夏茶游离脯氨酸在镉试验浓度下极显著增加,其相关系数r=0.980(P<0.01),且夏茶游离脯氨酸含量明显高于春茶;春茶可溶性糖都高于对照,其增加量先高后低.,相关系数为r=-0.342;夏茶可溶性糖呈下降趋势,其相关系数r=-0.909(P<0.05)。

Effects of different cadmium concentrations on growth of tea plant and physiological index in leaves of Mengshan tea were studied with the tea cultured in pots. Results showed that, low concentration of cadmium has no obvious adverse effect on the tea plant. When the cadmium concentration reached 60 mg/kg, the tea plant harmed to die; The chlorophy Ⅱ （Ch I ） content of most spring tea supplemented with Cd was higher than CK and the increasing trend was raised firstly and inhibited later. The chlorophy Ⅱ content of summer tea supplemented with Cd was significantly decreased with increase of cadmium concentration, and the chlorophy Ⅱ content showed a negative relationship with the cadmium concentration, and the coefficient of correlation was -0.997＊＊. The malondialdehyde （MDA） content in spring and summer tea was significantly enhanced with the increase of cadmium concentration. The coefficient of correlation were 0.970＊＊,0.994＊＊ （ P 〈 0.01 ） respectively. The free proline of spring tea was significantly enhanced wiyh the increase of Cd concentration, the coefficient of correlation was 0.829＊ （ P 〈 0.05 ） , the free proline in summer tea was significantly enhanced, and the coefficient of correlation was 0.980＊＊ （ P 〈 0.01 ） ,and the content of free praline in summer tea was higher than that in spring tea. The soluble sugar content in spring tea supplemented with Cd was higher than CK and the increasing trend raised firstly and then inhibited, the coefficient of correlation was -0.342 ; The soluble sugar content of summer tea supplemented with Cd was significantly decreased and the coefficient of correlation was -0.909＊ （ P〈0.05 ） .