Abstract: [Objective]The main aim of the present paper was to study the effects of UV-B radiation on biological trait,root growth ,yield and germplasm of cotton under the field experiment.[Method]Based on the sun light,4 treatments were designed to inhance UV-B radiation of cotton,the normal dose of every treatment radiation were follows:0 kJ/m~2 (R0),0.5 kJ/m~2(R1),1.0 kJ/m~2 (R2) and 1.5 kJ/m~2 respectively.The effect of enhancing UV-B radiation on biological trait index such as leaves,plant height,stem diameter,leaf area and the index of root growth,yield and quality of cotton were investigated.[Result]Results show that with the extension of radiation time and radiation enhanced leaf visible injury became more serious,height and stem diameter of R1,R2 and R3 reached a significant difference(P<0.05),all differences of leaf area treated reached a significant level,dry weight per plant reached a best significant level(P<0.01); compared with the control,the root morphology changed dramatically,length of root of R1,R2 and R3 have been reduced compared with that of control;quality and yield of cotton was significantly lower than that of control.[Conclusion]The enhanced UV-B radiation made a close relation between aerial part and root part of cotton,the greater UV-B radiation,the geater effect on cotton.

摘要： [目的]研究在大田栽培和自然光照条件下,人工模拟紫外辐射(UV-B,280～320 nm)增加对棉花生物性状、根系生长、产量和品质之间的影响.[方法]在自然光照的基础上,通过人工增加对棉花UV-B辐射,设置4个处理,每个处理的辐射剂量分别为0(R0)、0.5(R1)、1(R2)和1.5 w/m~2(R3).研究UV-B辐射增强对棉花生物性状指标,如叶片表观伤害、株高、茎粗、叶面积等以及根系生长指标特征参数、产量和品质的影响.[结果]随着辐射时间的延长和辐射剂量的增强,棉花叶片可见伤害症状越来越严重,R1、R2和R3处理棉花的株高和茎粗与对照R0相比达到了显著差异(P<0.05),各个处理之间叶面积差异达到了显著水平,单株干质量达到了极显著水平(P<0.01);与对照相比根系形态发生了明显的变化,R1、R2和R3处理分别比对照的根长、根表面积、根平均直径、根密度和根体积都有所减小;各个处理的棉花产量和品质显著低于对照.[结论]UV-B辐射增强使棉花地上部分和根系之间存在密切的直接关系,UV-B辐射强度越大对棉花的影响就越大.