早稻耐亚铁的水培鉴定指标研究

STUDY ON THE APPRAISING INDICES OF EARLY RICE TOLERANCE AGAINST Fe^(2+) IN WATER CULTURE

针对潜育性稻田的主要障碍因子是还原物质,而还原物质又以亚铁为主的事实,于1986～1989年用亚铁作毒害因子,通过水培研究了早稻耐亚铁的鉴定指标。结果表明120ppm为鉴别品种耐性差异的适宜亚铁浓度;苗高、根系生长量、根系氧化力、剑叶光合强度、干物质产量为鉴定指标。

Gleyed paddy soil is an important low-yielding paddy soil in south of China, which is characterized by long time water-submertion, low Eh and high contents of reducing substance. Fe^(2+) is a dominant reducing matter in gleyed paddy soil. Study on the appraising indices of early rice tolerance against Fe^(2+) in water culture was conducted from 1986 to 1989. The results showed that the available Fe^(2+) concentration to appraise tolerance of early rice against Fe^(2+) is about 120 ppm, and plant height, root biomass, root's oxidizability, photosynthetic rate of flagleaf and dry matter production can be taken as indices for appraising the tolerance.