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作 者 ：王千 依艳丽 张淑香

期 刊 ：植物营养与肥料学报 2012年 18卷 3期 页码：706-716

关键词：硝酸钾；硫酸钾；番茄；酶活性；

Keywords:potassium nitrate, potassium sulphate, tomato, enzyme activity,

摘 要 ：采用水培试验，研究不同钾肥水平（K 0、4.0、8.0、1.6 mmol/L）、钾肥品种（KNO3、K2SO4）对“中杂106（ZZ106）”和“毛粉802（MF820）”两种番茄幼苗生长、酚类物质代谢作用的影响。结果表明，两种钾肥均在倍增浓度（8.0 mmol/L）处理中的番茄叶片、根部酚类物质代谢最活跃。施用K2SO4处理植株鲜重、干重、植株钾含量均显著高于KNO3，但KNO3处理番茄苯丙氨酸解氨酶（PAL）活性、总酚、类黄酮、木质素含量均高于K2SO4。“中杂106”的代谢酶活性及代谢产物、鲜重、干重、叶片钾含量均显著高于“毛粉802”，但根系钾含量显著低于“毛粉802”。总之，施钾有利于番茄叶片和根系PAL、多酚氧化酶（PPO）、过氧化物酶（POD）活性的提高以及总酚、类黄酮和木质素的合成，供钾不足、过量均会降低代谢酶的活性以及影响酚类物质和木质素的含成。K2SO4比KNO3更能促进番茄植株生长发育，但施用KNO3的处理番茄植株酚类物质代谢能力优于K2SO4。“中杂106”的生长发育及酚类物质代谢能力均优于“毛粉802”。

Abstract:Based on the water culture，the different levels of K (0.0，4.0，8.0 and 16.0 mmol/L)，different potash fertilizers (KNO3 and K2SO4) and two tomato cultivars (ZZ106 and MF802) were selected to study the effects of potassium on seedling growth and phenol metabolism of tomato．The results show that the contents of secondary protective enzyme activities and secondary substances of the leaves and roots in the treatment of (8.0 mmol/L) are higher than those of other treatments．The biomasses and contents of K of the plants in the treatments of K2SO4 are higher than those in the treatments of KNO3, while the PAL activities, total phenol, flavonoids and lignin contents in the treatments of K2SO4 are lower than those of KNO3．The secondary protective enzyme activities and secondary substances, biomasses and K contents of leaves of the ZZ106 are significantly higher than those of the MF802, while the K contents of roots of the ZZ106 are significantly lower than those of the MF802．In short，K in leaves and roots can improve phenol metabolism．The potassium deficiency and over dose can reduce the metabolism of the enzyme activity and contents of phenolic，flavonoids and lignin．K2SO4 can promote tomato plant growth, but KNO3 is an advantage over K2SO4 on phenol metabolism．The growth and phenolic compounds of the ZZ106 are better than those of the MF802.

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