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用游离态放射性磷半衰期的迅速释放表示小麦旗叶开始衰老的特征(Morris等,1985),就使~(32)P示踪成为研究衰老过程的一种有用手段.小麦抽穗时,不同品种的旗叶经放射性同位素处理后恢复的程度和速率大不相同(Reilly等,1984).初步的大田研究表明,选定处理时间是关键.处理太早,示踪元素会不令人满意地移向第二、三、四幼叶的居间分生组织;抽穗后处理,示踪元素就直接向正在发育的穗移动而不在叶片中形成稳固的基线;恰在抽穗之
Using the rapid release half-life of free radioactive phosphorus as a marker of the onset of senescence in wheat flag leaves (Morris et al., 1985), the ~ (32) P tracer is a useful tool in the study of the senescence process.When heading, The extent and rate of leaf recovery after radioisotope treatment are quite different (Reilly et al., 1984). Preliminary field studies have shown that the selected treatment time is the key. Processing is too early and the tracer element will not move satisfactorily to the Interracial meristems of two, three, and four young leaves; heading at post-treatment, the tracer element moves directly to the developing ear without forming a firm baseline in the leaf;