| Effects of enhanced ultraviolet-B radiation on diurnal variations of photosynthesis in spring wheat in Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2006.04.18 |
| Key Words: UV-B radiation spring wheat photosynthesis |
| Author Name | Affiliation | | SU Zhan-sheng | Ningxia Key Laboratory for Disaster Prevention and Reduction,Yinchuan 750002,China；Ningxia Meteorological Observatory,Yinchuan 750002,China | | WANG Lian-xi | Ningxia Key Laboratory for Disaster Prevention and Reduction,Yinchuan 750002,China；Ningxia Meteorological Institute,Yinchuan 750002,China | | LI Fu-sheng | Ningxia Meteorological Institute,Yinchuan 750002,China | | HUANG Jian-wei | Ningxia Meteorological Institute,Yinchuan 750002,China |
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| Abstract: |
| Under natural conditions,the plants of spring wheat were exposed to different intensities of ultraviolet-B(UV-B) radiation and the diurnal variations of their photosynthetic rate and water use efficiency (WUE) were recorded in Ningxia.Compared to the control group,the photosynthetic rate,transpiration rate,stomatal conductivity and water use efficiency was reduced by 19.0%,9.8%,22.7% and 12.1%,respectively,in the plants subjected to R1 dose UV-B radiation(0.5 W/m2),and by 48.8%,19.5%,53.6% and 37.2%,respectively,in the plants subjected to R2 dose UV-B radiation(1.0 W/m2). These results indicated that,within the range of UV-B radiation intensity used in this study,the photosynthesis and WUE of spring wheat tended to reduce with the enhancement of UV-B radiation intensity. |
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