摘要
在不同磷水平(0、0.1、0.5、1.0、10.0、20.0 mmol/L)下培养黄瓜幼苗,研究磷素对黄瓜生长及养分吸收和分配的影响。结果表明,①随磷浓度增加,黄瓜根、茎和叶干重呈先增加后降低的趋势;供磷浓度为10.0 mmol/L时开始产生高磷胁迫症状,症状首先出现在老叶,沿叶脉两侧发黄、有光泽、向上凸起,子叶出现红色坏死斑点,严重时老叶坏死,新叶会出现叶脉间失绿症状。②随供磷水平增加,植株体内磷浓度增加,最高达到干重的1.28%;钾浓度在茎中呈先增加后降低的趋势,铜浓度降低,钙、镁、锰、锌等元素浓度及其在根、茎及叶间分配趋势无显著变化。
The growth and absorption and distribution of mineral nutrients in cucumber seedlings were studied under different phosphorus(P) levels(0,0.1,0.5,1.0,10.0,20.0 mmol/L).The results showed that,①the dry weight of roots,stems and leaves of cucumber seedlings increased firstly and then reduced with the increase of P levels.When P level was at or higher than 10.0 mmol/L,high-P-stress symptoms appeared at the oldest leaves initially,i.e.midrib and vein of leaf rose and turned into bright yellow along midrib and vein of leaf.Old leaves were firing withered and young leaves were intervein chlorosis when P toxicity was serious.②P concentration increased significantly in plants with the increase of P level,the highest P concentration reached to 1.28% of dry weight.Potassium concentration in plants increased firstly and then reduced,copper concentrations in plants decreased,but concentration of calcium,magnesium,manganese and zinc in plants did not change with the increase of P level.The distribution model of all the nutrients among roots,stems and leaves did not change under high P level.
出处
《湖北农业科学》
北大核心
2013年第1期52-55,共4页
Hubei Agricultural Sciences
基金
江苏省自然科学基金重点项目(BK2010097)
公益性行业(农业)科研专项课题(200903011)
国家自然科学青年基金项目(41001172)
中国科学院知识创新工程重大项目课题(KSCX2-EW-N-08)
关键词
高磷胁迫
黄瓜
养分吸收
养分分配
high phosphorus stress
cucumber
nutrient absorption
nutrient distribution
