马铃薯适应低磷胁迫的生理生化效应

以马铃薯两个栽培种大西洋和新大坪为材料,采用基本Hoagland营养液和60%磷浓度(0.05996 μmol/L)的Hoagland营养液处理,研究了低磷胁迫效应对马铃薯植株生长、保护酶活性和叶绿素含量影响.结果表明,60%磷胁迫对马铃薯地上部分生长具有抑制作用,能促进新大坪侧根生长和根冠比增加,而大西洋在根系生长和...

Physiological and Biochemical Responses of Potato to Low Phosphorus Stress

Effects of the low-phosphorus stress on root growth and the protective enzyme activity of two potato cultivars (Atlantic and Xindaping) were investigated under the conditions by addition of normal Hoagland’s nutrient solution and 60% phosphorus concentration of Hoagland solution. The results indicated that 60% phosphorus concentration could restrict the over ground part growth of plant but promote the ability of lateral root generation and the root/shoot ratio in cv. Xindaping, however no significant changed was found in root growth and lateral root number when compared with the control for cv. Atlantic. When stressed for forty days, the guaiacol peroxidases (POD) and catalase (CAT) activity and in cv. Atlantic maintained relatively stable and the superoxide dismutases (SOD) and chlorophyll content decreased significantly, whereas those in cv. Xindaping fell rapidly, which were significantly different from the control. These results suggest that it would be more adapted for cv. Atlantic to grow under 60% phosphorus concentration conditions compared with cv. Xindaping.