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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (10): 1278-1282.

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TANG Lina, LIN Wenxiong, WU Xingchun, LIANG Yiyuan, CHEN Fangyu   

  1. Fujian Agriculture and Forestry University, Fuzhou 350002
  • Received:2002-04-09 Revised:2002-07-03 Online:2002-10-15

Abstract: Effect of enhanced ultraviolet-Bradiation (280~320nm) on growth, development and yield formation in the three rice cultivars (Oryza stativa L.) under pot condition were investigated. The results showed that enhanced ultraviolet-Bradiation decreased rice height, tiller number, total leaf area and biomass, but the inhibitory rate varied in different cultivars and developmental stages. Plant height was decreased by 9.4%~12.2% in seedling stage, plant shoot and root of dry matter were decreased by 45.3%~59.8% and 54.9%~59.0% respectively in tillering period.The leaf emergence delayed, resulting in delayed time of flowering in Shanyou 63, Nanchuan and IR65600-85 by 2d,3d and 7d,prolonged total growth period by 3d,4d and 9d.Net photosynthesis rate of Shanyou 63,Nanchuan and IR65600-85 were decreased by 11.9%, 12.8% and 29.7%, respectively. Attributed to decreased contents of chlorophyll a, b, carotenoid and induction kinetics parameters of Fv, Fv/Fm and Fv/Fo. Effective panicle per plant, total grain number per panicle, filled grain rate and 1000-grain weight were decreased by enhanced UV-B radiation. Consequently the grain yields were reduced by 25.2%~31.1%.

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