【摘要】 在大田条件下,模拟UV-B辐射增强(5.0kJ·m-2,相当于昆明地区臭氧层减少20%),着重研究了10个小麦品种对UV-B辐射响应的生长和产量差异。结果表明,经增强UV-B辐射,10个小麦品种在株高、叶面积指数、分蘖数、地上部分的生物量、产量都发生了明显的变化,且存在种内差异;分蘖数的变化是引起地上生物量(r=0.94,P<0.01)和产量(r=0.92,P<0.01)变化的主要因素;根据生长响应指数(RI)判定供试小麦品种对UV-B辐射增强的耐性顺序为:绵阳26>辽春9>绵阳20>文麦3>文麦5>陇春15>云麦39>凤麦24>会宁18>陇春16。更多还原

【Abstract】 The impact of enhanced UV-B radiation has been investigated extensively, most of which are conducted in growth chambers and greenhouses where the unnatural spectral balance of radiation may substantially change plant sensitivity to UV-B and lead to unrealistic conclusions, and little is known about intraspecific responses of plants to enhanced UV-B. 10 wheat cultivars were grown in field under ambient and supplemental levels of UV-B radiation to study intraspecific differences in growth and grain yield response of 10 wheat cultivars to UV-B radiation. The supplemental UV-B radiation was 5.00kJ·m-2, simulating a depletion of 20% stratospheric ozone. Seven wheat cultivars showed significant changes in plant height, with three increasing and four decreasing. The effect of UV-B on leaf area index also varied with different cultivars, one showed significant increase and five cultivars decrease; one cultivar showed significantly increase in tiller number and five cultivars significantly decreased. Among the ten cultivars, six cultivars significantly decreased in shoot biomass and grain yield. UV-B radiation had a positive effect on shoot biomass and grain yield respectively. The change of tiller number was an important reason for the change of shoot dry weight (r=0.94, P<0.01) and yield (r=0.92, P<0.01). According to RI, tolerance to UV-B radiation was Mianyang26>Liaochun9>Mianyang20>Wenmai3>Wenmai5>Longchun15> Yunmai39>Fengmai24 >Huining18>Longchun16.更多还原