摘要
应用32P、86Rb同位素示踪技术,在聚乙二醇高渗液模拟土壤干旱及不同水分条件下,研究水稻品种抗旱能力的差异。结果表明,不同品种水稻对磷、钾(以86Rb代K)的需求不同,在吸收和累积磷、钾的能力上,品种间存在明显差异。经水分胁迫处理,水稻吸收磷、钾的数量明显减少,其减少程度与品种的抗旱能力有密切关系,抗旱性能愈强,吸收32P、86Rb的水旱差异愈小。利用不同品种植株叶片放射性活度的旱水比值差异,可以鉴定水稻品种的抗旱性。
The ability of drought resistance of rice cultivars under water stress and soil drought was studied using 32P and 86Rb tracer techniques.Based on 32P and 86Rb tracer experiments, the following results were obtained:different cultivars of rice have different demand for nutrition of phosphorus (32P)and potassium (86Rb), a significant difference of 32p or 86Rb uptake in cultivars existed.The uptake of 32P and 86Rb by rice was decreased due to water stress.The ratio of radioactivity of 32P or 86Rb uptake by rice under water stress and non-stress condition was closely related to drought resistance of cultivars.The higher the drought resistance of the cultivar, the larger was the ratio of activity of 32P or 86Rb uptake as compared with the control.Therefore we can use 32P and 86Rb tracer techniques to identify the drought resistance of rice cultivars according to the characteristics of absorption of phosphorus and potassium.
出处
《核农学报》
CAS
CSCD
1989年第2期112-118,共7页
Journal of Nuclear Agricultural Sciences
关键词
水稻
抗旱性
水分胁迫
示踪技术
Rice, water stress, drought resistance, ^(32)P and ^(86)Rb tracer techniques
