Abstract: In order to investigate the effect of soil Cu content on morphological and physiological traits of main root at the tillering and heading stages in association with the grain yield of rice,pot experiments were conducted using the japonica variety Wuxiangjing 14 as materials.Rice root growth was inhibited seriously by soil Cu stress,and the damage to rice root growth were increased with the increment of soil Cu content,similar trends were found under both silty soil and loam soil conditions.At the tillering stage,lower soil Cu content had small effect on the amount of α-NA oxidation ability per unit dry weight of root and contents of zeatin(Z) + zeatin riboside(ZR) in root,while higher soil Cu content resulted in significant decreases in the root activity per unit dry weight.With the increasing of soil Cu content,the proportion of the root growing before elongation was decreased,while that after elongation was increased,resulting in significant enhancement in the amount of α-NA oxidation ability per unit root dry weight at the heading stage.Soil Cu treatments had a significant effect on the amount of α-NA oxidation ability per plant.The higher the soil Cu content was,the smaller the amount of α-NA oxidation ability per plant at the elongating and heading stages became.With the increasing of soil Cu content,the grain yield decreased significantly.Similar trends were found under both silt soil and loam soil conditions.The regression analysis showed that significant positive correlations existed between root dry weight,the amount of α-NA oxidation ability per plant at heading and grain yield of rice,with correlation coefficients of 0.95^** and 0.97^**,respectively.

Key words: rice, soil copper content, root, physiological traits, yield

摘要： 在盆栽土培条件下，以武香粳14为供试品种，研究了土壤铜含量对水稻根系生长和根系活性的影响及其与产量的关系。结果表明：1) 土壤铜处理对水稻根系的生长具有明显的抑制作用，土壤铜含量越高，对根系生长的抑制作用越大，粉砂土、壤土条件下表现一致；2) 较低的土壤铜含量对水稻分蘖期单位干质量根系的α萘胺(αNA)氧化力、基于单位鲜质量的根系玉米素(Z) + 玉米素核苷(ZR)的含量影响不大，较高的土壤铜含量则使基于单位质量的根系活性显著低于对照；3) 随着土壤铜含量的提高，拔节前生长的根系比例减少、拔节后生长的根系比例增加、抽穗期基于单位根干质量的根系αNA氧化力显著提高；4) 土壤铜处理对水稻单株根系活性有极显著影响，土壤铜含量越高，分蘖期和抽穗期的单株根系αNA氧化力越小；5) 土壤铜处理使水稻产量显著低于对照，且随着土壤铜含量的提高产量的下降幅度显著增大，粉砂土、壤土条件下表现一致；6) 抽穗期的单株根干质量、单株根系αNA氧化力与水稻产量均呈极显著的线性正相关，相关系数分别为095**和097**。

关键词: 水稻, 土壤铜含量, 根系, 生理特性, 产量