水稻品种对低钾逆境的耐性有明显的基因型差异,因而可以通过筛选利用耐低钾的水稻品种来减轻稻田缺钾和钾肥供不应求的矛盾。但是,如何迅速、准确地筛选出耐低钾品种?目前还没有成熟的技术经验。我们经过几年的摸索,认为利用暗呼吸法筛选耐低钾品种,比较有效。该方法的基本原理是根据用同位素示踪技术证明的品种耐低钾能力强弱与钾缺乏时叶片暗呼吸强弱成负相关关系的规律,将缺钾条件下培养的不同品种稻 Rice cultivars have obvious genotypic differences in their tolerance to hypoxia stress. Therefore, the contradiction between the short supply of potassium and the shortage of potash can be alleviated by screening low-potassium tolerant rice varieties. However, how to quickly and accurately filter out low potassium tolerant varieties? There is no mature technical experience. After several years of exploration, we believe that the use of dark breathing method to screen low potassium tolerant species, more effective. The basic principle of the method is based on the isotope tracing technique to prove the variety of tolerance to low potassium capacity and potassium deficiency leaf dark respiration intensity is a negative correlation between the law of potassium deficiency conditions under the cultivation of different varieties of rice